CN106684426A - Formation method of softly-packed lithium ion battery - Google Patents
Formation method of softly-packed lithium ion battery Download PDFInfo
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- CN106684426A CN106684426A CN201611247450.6A CN201611247450A CN106684426A CN 106684426 A CN106684426 A CN 106684426A CN 201611247450 A CN201611247450 A CN 201611247450A CN 106684426 A CN106684426 A CN 106684426A
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- 238000000034 method Methods 0.000 title claims abstract description 77
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 54
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 22
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 19
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 88
- 229910052744 lithium Inorganic materials 0.000 claims description 88
- 239000000126 substance Substances 0.000 claims description 61
- 230000002194 synthesizing effect Effects 0.000 claims description 43
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 230000032683 aging Effects 0.000 claims description 17
- 238000009413 insulation Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 claims description 6
- 238000010281 constant-current constant-voltage charging Methods 0.000 claims description 3
- 230000014759 maintenance of location Effects 0.000 abstract description 17
- 238000007600 charging Methods 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 2
- 238000010277 constant-current charging Methods 0.000 abstract 2
- 239000007788 liquid Substances 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000022131 cell cycle Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 3
- 101100117236 Drosophila melanogaster speck gene Proteins 0.000 description 2
- WMFOQBRAJBCJND-UHFFFAOYSA-M Lithium hydroxide Chemical compound [Li+].[OH-] WMFOQBRAJBCJND-UHFFFAOYSA-M 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 239000007784 solid electrolyte Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000010613 Electrolyte Activity Effects 0.000 description 1
- FUJCRWPEOMXPAD-UHFFFAOYSA-N Li2O Inorganic materials [Li+].[Li+].[O-2] FUJCRWPEOMXPAD-UHFFFAOYSA-N 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- XUCJHNOBJLKZNU-UHFFFAOYSA-M dilithium;hydroxide Chemical compound [Li+].[Li+].[OH-] XUCJHNOBJLKZNU-UHFFFAOYSA-M 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0468—Compression means for stacks of electrodes and separators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention relates to a formation method of a softly-packed lithium ion battery. The method comprises: using a 0.01-0.05 C current to perform low-current pre-charging to a softly-packed lithium ion battery till the cut-off voltage reaches 3.0 V; using a 0.1-1.0 C current to perform constant-current charging till the cut-off voltage reaches 3.6 V; and using a 0.5-3.0 C current to perform constant-current charging till the cut-off voltage reaches 4.2 V and the cut-off current reaches 0.01-1.0 C. In the formation process, the surface pressure of two sides of the softly-packed lithium ion battery is kept no less than 0.4 MPa, and the temperature of the softly-packed lithium ion battery is kept no more than 80 DEG C. In the formation process, pressure is applied to two sides of the battery, so that the positive and negative electrodes fully contact the separator film, the surface states of electrode pieces are balanced, and surface SEI films are uniformly formed. The formed softly-packed lithium ion battery has stable impact SEI films, is uniform in quality, less in defects, high in battery liquid retention and excellent in cycle performance and safety performance.
Description
Technical field
The invention belongs to technical field of lithium ion, and in particular to a kind of chemical synthesizing method of soft bag lithium ionic cell.
Background technology
Lithium ion battery has the advantages that big running voltage height, energy density, small volume, memory-less effect and life-span length,
It is widely used in the fields such as 3C class digital products, New-energy electric vehicle.
Lithium ion battery chemical conversion refers to the process of that lithium ion battery charges for the first time, it is therefore an objective to make battery that there is electrochemistry to live
Property the process of activation (lithium ion battery material).Chemical conversion is to form one layer of solid electrolyte interface film (SEI films) in negative terminal surface,
SEI films have solid electrolyte property, are electronic bodies.But this SEI films are Li+Excellence conductor, Li+Can be free
Ground passes through SEI films.The main component of SEI films is Li2CO3、LiF、Li2O、LiOH、ROCO2Li, ROLi and (ROCO2Li)2Deng.Cause
The formation of this SEI film can consume Li+, reduce first charge-discharge efficiency.SEI films have the insoluble characteristic of organic solvent, You Jirong
Agent molecule can not effectively prevent destruction of the organic solvent molecule in electrolyte to electrode material by SEI films.SEI films
Quality with chemical conversion technique have very big dependency, if fertilizer alleviant is bad, the SEI films of high-quality cannot be formed,
The cycle life and chemical property of battery are had a very big impact.Chemical synthesis technology is related to the height of battery capacity, circulation
Many qualities such as the length and security performance in life-span, therefore, chemical synthesis technology determines to a certain extent battery performance
Quality.
The lithium ion battery that existing chemical synthesis technology makes has that cycle life is short, high-temperature storage performance is poor, security performance
The performance issues such as difference, while its production process is also more numerous and diverse.The conventional chemical synthesizing method main flow of soft bag lithium ionic cell is：
Ageing → first time concora crush → pre- chemical conversion → room temperature is aging → second concora crush → second chemical conversion → high temperature ageing；Plus all
Operating process, the time of whole preparation process is probably in 138h or so, and personnel are more needed for production process, takes time and effort.
Plus in process of production, because artificial contact battery number of times is more, the damage to soft bag lithium ionic cell and report are easily caused
Give up, not only low production efficiency, and adds additional production cost, for especially larger to area battery, the electricity after chemical conversion
Pond cathode pole piece apparent condition is unbalanced, and many regions closely do not cause chemical conversion degree not enough because of contact, and impurity decomposition reaction is not
Thoroughly, pole piece local black speck, analysis lithium are caused, the cycle performance and security performance of battery is had a strong impact on.
The content of the invention
It is an object of the invention to provide a kind of chemical synthesizing method of soft bag lithium ionic cell, solves existing chemical synthesizing method production week
Phase is long, and the not good problem of the soft bag lithium ionic cell cycle performance after being melted into.
In order to realize object above, the technical solution adopted in the present invention is：
A kind of chemical synthesizing method of soft bag lithium ionic cell, including first using 0.01C~0.05C electric currents to Soft Roll lithium-ion electric
Pond carries out small current precharge, to blanking voltage 3.0V；0.1C~1.0C electric current constant-current charges are adopted again, to blanking voltage
3.6V；Then 0.5C~3.0C electric current constant-current constant-voltage chargings are adopted, to blanking voltage 4.2V, cut-off current 0.01C~1.0C；
In above-mentioned formation process, the surface pressure that soft bag lithium ionic cell both sides are subject to is kept to be not less than 0.4MPa, Soft Roll lithium
The temperature of ion battery is less than 80 DEG C.
The present invention soft bag lithium ionic cell chemical synthesizing method, process pair as if ageing terminate Soft Roll lithium-ion electric
Pond.
Preferably, the chemical synthesizing method of described soft bag lithium ionic cell, comprises the steps：
1) soft bag lithium ionic cell is placed in battery formation clamp, it is ensured that the surface pressure that soft bag lithium ionic cell both sides are subject to is not
Less than 0.4MPa；Soft bag lithium ionic cell is heated up, temperature upper limit is less than 80 DEG C；
2) it is melted into：First small current precharge is carried out to soft bag lithium ionic cell using 0.01C~0.05C electric currents, to cut-off
Voltage 3.0V；0.1C~1.0C electric current constant-current charges are adopted again, to blanking voltage 3.6V；Then it is permanent using 0.5C~3.0C electric currents
Stream constant-voltage charge, to blanking voltage 4.2V, cut-off current 0.01C~1.0C；
Step 2) formation process in, carry out heat-insulation pressure keeping to soft bag lithium ionic cell, control temperature deviation is less than ± 5
DEG C, pressure divergence is less than ± 0.02MPa.
Step 1) in, the battery formation clamp is the battery formation clamp of high-temperature pressurizing formation device, and the battery formation clamp has to be used for
The clamping plate of clamping soft bag lithium ionic cell.When using, the two sides of soft bag lithium ionic cell are entered using the clamping plate of battery formation clamp
The whole face of row uniformly presses, it is ensured that battery both sides are subject to normal pressure.
Step 2) formation process in, carry out heat-insulation pressure keeping to soft bag lithium ionic cell, control temperature and pressure deviation exists
In certain limit, it is ensured that chemical conversion temperature, pressure conditional stability so that the SEI films of formation have the preferable uniformity and stability.
Described heat-insulation pressure keeping refer to keep step 1) set by temperature and pressure.
The chemical synthesizing method of described soft bag lithium ionic cell, also including step 3)：
3) by step 2) chemical conversion terminate after soft bag lithium ionic cell high temperature ageing is carried out under the conditions of 40~65 DEG C.
The time of the high temperature ageing is 36~96h.
In formation process, the surface pressure that soft bag lithium ionic cell both sides are subject to is 0.4~3.0MPa.
In formation process, the temperature of soft bag lithium ionic cell is 40~80 DEG C.Under conditions of High Temperature High Pressure, lithium-ion electric
The both positive and negative polarity in pond is good with the contact of barrier film, and electrolyte activity is high, contributes to the formation of SEI films；Simultaneously aerogenesis can be discharged quickly,
Avoid gas residue affects the uniformity of pole piece SEI film between pole piece.
The time of small current precharge is 28~32min.Preferably, the time of small current precharge is 30min.
Preferably, step 2) in, the electric current of the constant-current constant-voltage charging is more than the electric current of the constant-current charge.I.e. in chemical conversion
During, three stage charging currents in the trend that gradually increases, be favorably improved SEI films are formed in formation process concordance and
Stability.
The ambient humidity of the high temperature ageing is 0~60%RH.
Soft bag lithium ionic cell both sides are applied by the chemical synthesizing method of the soft bag lithium ionic cell of the present invention in formation process
The surface pressure of 0.4MPa is not less than, on the one hand keeps core strueture smooth, stable, prevent volumetric expansion in formation process；It is another
Aspect causes both positive and negative polarity to be fully contacted with barrier film, makes pole piece state equalization, prevents because contact does not closely cause chemical conversion degree
Not enough, impurity decomposition reaction is not thorough, causes pole piece local black speck, the problem of analysis lithium, makes the formation of negative terminal surface SEI film more equal
Even, reaching improves the effect of cathode interface state.In formation process, first it is pre-charged using small current, makes the active matter in battery
Matter and electrolyte slow reaction, form the passivating film of densification so as to higher degree of compaction and stability in negative terminal surface；Afterwards
Phase is charged using larger current, while lithium ion movement is activated, is conducive to further forming stable fine and close SEI
Film, while improving formation efficiency, shortens the production cycle.Using the soft bag lithium ionic cell of the chemical synthesizing method of the present invention, with steady
Fixed fine and close SEI films, uniform quality, defect is few, is allowed to good storage performance, cycle performance and security performance, while
The hardness and flatness of soft bag lithium ionic cell are improve, cycle life of lithium ion battery is extended.
The chemical synthesizing method of the soft bag lithium ionic cell of the present invention, with short production cycle, formation process efficiency high, process is simple,
Easy to operate, low cost, it is easy to Automated condtrol is adapted to large-scale industrial production.
Description of the drawings
Fig. 1 is to be compared with the soft bag lithium ionic cell cycle performance of conventional chemical synthesizing method using the chemical synthesizing method of embodiment 1；
Fig. 2 is to be compared with the soft bag lithium ionic cell cycle performance of conventional chemical synthesizing method using the chemical synthesizing method of embodiment 2；
Fig. 3 is to be compared with the soft bag lithium ionic cell cycle performance of conventional chemical synthesizing method using the chemical synthesizing method of embodiment 3；
Fig. 4 is to be compared with the soft bag lithium ionic cell cycle performance of conventional chemical synthesizing method using the chemical synthesizing method of embodiment 4.
Specific embodiment
With reference to specific embodiment, the present invention is further illustrated.
Embodiment 1
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprises the following steps：
1) soft bag lithium ionic cell that ageing terminates is held in the battery formation clamp of high-temperature pressurizing formation device, opens pressure
Pressure between fixture is risen to power switch the value of setting, it is ensured that the surface pressure that soft bag lithium ionic cell both sides are subject to is 1.5MPa；
The temperature value of high-temperature pressurizing formation device is set as 65 DEG C, opening temperature switch heats up to soft bag lithium ionic cell
To 65 DEG C；
2) it is melted into：First small current precharge is carried out to soft bag lithium ionic cell using 0.03C electric currents, charging interval 30min,
Blanking voltage 3.0V；0.5C electric current constant-current charges are adopted again, to blanking voltage 3.6V；Then filled using 1.0C electric current constant current constant voltages
Electricity, to blanking voltage 4.2V, cut-off current 0.1C；
Step 2) formation process in, carry out heat-insulation pressure keeping (65 DEG C, 1.5MPa) to soft bag lithium ionic cell, control temperature
Deviation is less than ± 5 DEG C, and pressure divergence is less than ± 0.02MPa；
After above-mentioned formation process terminates, the pressure between battery formation clamp is shed, close attemperator, take out battery；
3) by step 2) soft bag lithium ionic cell after chemical conversion terminates is placed in 50 DEG C, enters in the hot environment of humidity 40%RH
Row high temperature ageing 70h.
Embodiment 2
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprises the following steps：
1) soft bag lithium ionic cell that ageing terminates is held in the battery formation clamp of high-temperature pressurizing formation device, opens pressure
Pressure between fixture is risen to power switch the value of setting, it is ensured that the surface pressure that soft bag lithium ionic cell both sides are subject to is 2.9MPa；
The temperature value of high-temperature pressurizing formation device is set as 45 DEG C, opening temperature switch heats up to soft bag lithium ionic cell
To 45 DEG C；
2) it is melted into：First small current precharge is carried out to soft bag lithium ionic cell using 0.02C electric currents, charging interval 30min,
Blanking voltage 3.0V；0.7C electric current constant-current charges are adopted again, to blanking voltage 3.6V；Then filled using 2.0C electric current constant current constant voltages
Electricity, to blanking voltage 4.2V, cut-off current 0.5C；
Step 2) formation process in, carry out heat-insulation pressure keeping (45 DEG C, 2.9MPa) to soft bag lithium ionic cell, control temperature
Deviation is less than ± 5 DEG C, and pressure divergence is less than ± 0.02MPa；
After above-mentioned formation process terminates, the pressure between battery formation clamp is shed, close attemperator, take out battery；
3) by step 2) soft bag lithium ionic cell after chemical conversion terminates is placed in 40 DEG C, enters in the hot environment of humidity 50%RH
Row high temperature ageing 96h.
Embodiment 3
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprises the following steps：
1) soft bag lithium ionic cell that ageing terminates is held in the battery formation clamp of high-temperature pressurizing formation device, opens pressure
Pressure between fixture is risen to power switch the value of setting, it is ensured that the surface pressure that soft bag lithium ionic cell both sides are subject to is 0.5MPa；
The temperature value of high-temperature pressurizing formation device is set as 55 DEG C, opening temperature switch heats up to soft bag lithium ionic cell
To 55 DEG C；
2) it is melted into：First small current precharge is carried out to soft bag lithium ionic cell using 0.01C electric currents, charging interval 30min,
Blanking voltage 3.0V；0.1C electric current constant-current charges are adopted again, to blanking voltage 3.6V；Then filled using 0.5C electric current constant current constant voltages
Electricity, to blanking voltage 4.2V, cut-off current 0.01C；
Step 2) formation process in, carry out heat-insulation pressure keeping (55 DEG C, 0.5MPa) to soft bag lithium ionic cell, control temperature
Deviation is less than ± 5 DEG C, and pressure divergence is less than ± 0.02MPa；
After above-mentioned formation process terminates, the pressure between battery formation clamp is shed, close attemperator, take out battery；
3) by step 2) soft bag lithium ionic cell after chemical conversion terminates is placed in 55 DEG C, enters in the hot environment of humidity 30%RH
Row high temperature ageing 64h.
Embodiment 4
The chemical synthesizing method of the soft bag lithium ionic cell of the present embodiment, comprises the following steps：
1) soft bag lithium ionic cell that ageing terminates is held in the battery formation clamp of high-temperature pressurizing formation device, opens pressure
Pressure between fixture is risen to power switch the value of setting, it is ensured that the surface pressure that soft bag lithium ionic cell both sides are subject to is 2.0MPa；
The temperature value of high-temperature pressurizing formation device is set as 75 DEG C, opening temperature switch heats up to soft bag lithium ionic cell
To 75 DEG C；
2) it is melted into：First small current precharge is carried out to soft bag lithium ionic cell using 0.05C electric currents, charging interval 30min,
Blanking voltage 3.0V；1.0C electric current constant-current charges are adopted again, to blanking voltage 3.6V；Then filled using 3.0C electric current constant current constant voltages
Electricity, to blanking voltage 4.2V, cut-off current 1.0C；
Step 2) formation process in, carry out heat-insulation pressure keeping (75 DEG C, 2.0MPa) to soft bag lithium ionic cell, control temperature
Deviation is less than ± 5 DEG C, and pressure divergence is less than ± 0.02MPa；
After above-mentioned formation process terminates, the pressure between battery formation clamp is shed, close attemperator, take out battery；
3) by step 2) soft bag lithium ionic cell after chemical conversion terminates is placed in 60 DEG C, enters in the hot environment of humidity 20%RH
Row high temperature ageing 32h.
Step 2 in the chemical synthesizing method of above-described embodiment) the chemical conversion cycle in 2.5~5.0h, be melted into cycle is short.
Experimental example
This experimental example is to the chemical synthesizing method using embodiment 1-4 and the soft bag lithium ionic cell cyclicity of conventional chemical synthesizing method
Can be detected.Testing conditions are room temperature, 2C, 100%SOC.As a result as Figure 1-4.
It will be seen from figure 1 that using the soft bag lithium ionic cell of conventional chemical synthesizing method after circulating beyond 600 times, capacity
Conservation rate drops to 90%, circulates beyond 1000 times afterwards, and capability retention circulates beyond 1300 times in the trend that declines to a great extent
Afterwards, capability retention falls to less than 75%.And the soft bag lithium ionic cell of the chemical synthesizing method of embodiment 1 is adopted, in circulation 1000
Still 95%, when circulating beyond 1500 times, capability retention remains at more than 90% to capability retention when secondary.
Figure it is seen that using the soft bag lithium ionic cell of conventional chemical synthesizing method after circulating beyond 950 times, capacity
Conservation rate drops to 90%, and afterwards in the trend that declines to a great extent, after circulating beyond 1050 times, capability retention falls to capability retention
Less than 75%.And the soft bag lithium ionic cell of the chemical synthesizing method of embodiment 2 is adopted, when circulating 1350 times, capability retention still exists
More than 95%, when circulating beyond 1800 times, capability retention remains at more than 90%.
From figure 3, it can be seen that using the soft bag lithium ionic cell of conventional chemical synthesizing method after circulating beyond 750 times, capacity
Conservation rate drops to 90%, circulates beyond 1200 times afterwards, and capability retention circulates beyond 1300 times in the trend that declines to a great extent
Afterwards, capability retention falls to less than 70%.And the soft bag lithium ionic cell of the chemical synthesizing method of embodiment 3 is adopted, in circulation 1200
Still more than 90%, when circulating beyond 2200 times, capability retention remains at more than 80% to capability retention when secondary.
From fig. 4, it can be seen that using the soft bag lithium ionic cell of conventional chemical synthesizing method after circulating beyond 700 times, capacity
Conservation rate drops to 90%, circulates beyond 1200 times afterwards, and capability retention circulates beyond 1300 times in the trend that declines to a great extent
Afterwards, capability retention falls to less than 75%.And the soft bag lithium ionic cell of the chemical synthesizing method of embodiment 4 is adopted, in circulation 700 times
When capability retention still more than 95%, when circulating beyond 1400 times, capability retention remains at more than 90%.
Testing result shows, using the soft bag lithium ionic cell of the chemical synthesizing method of the present invention, with good cycle performance.
Claims (7)
1. a kind of chemical synthesizing method of soft bag lithium ionic cell, it is characterised in that：Including first using 0.01C~0.05C electric currents to soft
Bag lithium ion battery carries out small current precharge, to blanking voltage 3.0V；0.1C~1.0C electric current constant-current charges are adopted again, are extremely cut
Only voltage 3.6V；Then 0.5C~3.0C electric current constant-current constant-voltage chargings are adopted, to blanking voltage 4.2V, cut-off current 0.01C~
1.0C；
In above-mentioned formation process, the surface pressure that soft bag lithium ionic cell both sides are subject to is kept to be not less than 0.4MPa, Soft Roll lithium ion
The temperature of battery is less than 80 DEG C.
2. the chemical synthesizing method of soft bag lithium ionic cell according to claim 1, it is characterised in that：Comprise the steps：
1) soft bag lithium ionic cell is placed in battery formation clamp, it is ensured that the surface pressure that soft bag lithium ionic cell both sides are subject to is not less than
0.4MPa；Soft bag lithium ionic cell is heated up, temperature upper limit is less than 80 DEG C；
2) it is melted into：First small current precharge is carried out to soft bag lithium ionic cell using 0.01C~0.05C electric currents, to blanking voltage
3.0V；0.1C~1.0C electric current constant-current charges are adopted again, to blanking voltage 3.6V；Then it is permanent using the constant current of 0.5C~3.0C electric currents
Pressure charges, to blanking voltage 4.2V, cut-off current 0.01C~1.0C；
Step 2) formation process in, carry out heat-insulation pressure keeping to soft bag lithium ionic cell, control temperature deviation is less than ± 5 DEG C,
Pressure divergence is less than ± 0.02MPa.
3. the chemical synthesizing method of soft bag lithium ionic cell according to claim 2, it is characterised in that：Also include step 3)：
By step 2) chemical conversion terminate after soft bag lithium ionic cell high temperature ageing is carried out under the conditions of 40~65 DEG C.
4. the chemical synthesizing method of the soft bag lithium ionic cell according to claim 1,2 or 3, it is characterised in that：In formation process,
The surface pressure that soft bag lithium ionic cell both sides are subject to is 0.4~3.0MPa.
5. the chemical synthesizing method of the soft bag lithium ionic cell according to claim 1,2 or 3, it is characterised in that：In formation process,
The temperature of soft bag lithium ionic cell is 40~80 DEG C.
6. the chemical synthesizing method of the soft bag lithium ionic cell according to claim 1,2 or 3, it is characterised in that：Small current preliminary filling
The time of electricity is 28~32min.
7. the chemical synthesizing method of soft bag lithium ionic cell according to claim 3, it is characterised in that：The ring of the high temperature ageing
Border humidity is 0~60%RH.
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| CN107195885A (en) * | 2017-06-01 | 2017-09-22 | 维动新能源股份有限公司 | A kind of carbon nanotube polymer lithium ion battery and preparation method thereof |
| CN107508009A (en) * | 2017-08-24 | 2017-12-22 | 四川长虹电源有限责任公司 | The method for eliminating soft bag lithium ionic cell flatulence |
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Address after: 454191 Industrial Cluster Area, Jiaozuo City, Henan Province, Standardized Workshop Area on the North Side of Xinyuan Road, West Park Applicant after: Multi-fluorine New Energy Technology Co., Ltd. Address before: 454191 Henan Jiaozuo industrial agglomeration area, West Park, Xinyuan Road, north side of the standardization workshop. Applicant before: Duofuduo (Jiaozuo) Amperex Technology Limited |
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