CN109037815A - A kind of formation method of lithium iron phosphate battery - Google Patents
A kind of formation method of lithium iron phosphate battery Download PDFInfo
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- CN109037815A CN109037815A CN201811109967.8A CN201811109967A CN109037815A CN 109037815 A CN109037815 A CN 109037815A CN 201811109967 A CN201811109967 A CN 201811109967A CN 109037815 A CN109037815 A CN 109037815A
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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
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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
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- 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
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- 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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Abstract
本发明公开了一种磷酸铁锂电池的化成方法，首先将注液后完成高温浸润的电池流转到化成设备，首先进行静置，然后一次化成后再将电池流转到高温老化房进行一次高温老化；然后将一次高温老化后的电池流转到化成设备，首先进行静置，然后进行二次化成，最后将电池流转到高温老化房进行二次高温老化。本发明在进入化成设备时先将电池进行静置，保证前期SEI膜形成的过程中温度的稳定性；本发明在VC等添加剂初步还原形成SEI膜后进行一次高温老化，再完成后续的化成及二次高温老化，双重老化保证SEI膜形成的稳定性及完备性。The invention discloses a formation method of a lithium iron phosphate battery. Firstly, the battery that has completed high-temperature infiltration after liquid injection is transferred to a formation equipment, and is first left to stand, and then the battery is transferred to a high-temperature aging room for a high-temperature aging after a formation. ; Then transfer the battery after primary high-temperature aging to the formation equipment, first let it stand, then perform secondary formation, and finally transfer the battery to the high-temperature aging room for secondary high-temperature aging. In the present invention, when entering the formation equipment, the battery is firstly placed to stand to ensure the stability of the temperature during the formation of the SEI film in the early stage; in the present invention, a high-temperature aging is performed after the initial reduction of VC and other additives to form the SEI film, and then the subsequent formation and formation are completed. Secondary high temperature aging, double aging ensures the stability and completeness of SEI film formation.
Description
Technical field
The present invention relates to technical field of lithium batteries, the chemical synthesizing method of specifically a kind of ferric phosphate lithium cell.
Background technique
With the extensive use of lithium ion battery, properties are excellent and the lithium ion battery that has extended cycle life increasingly by
To the welcome of people.In the production process of lithium ion battery, need to carry out first preactivate and stabilization to the battery of complete fluid injection
Change, that is, last chemical conversion-aging process, properties and cycle life to lithium ion battery have vital shadow
It rings.
Chemical conversion is exactly that the charging of a low current is carried out to the lithium ion battery manufactured, is carried out to electrode active material
Activation, and the passivation thin layer for being covered on carbon electrodes, i.e. solid electrolytic are formed on the phase interface of Carbon anode and electrolyte
Matter phase interface or SEI film.Aging is exactly that the battery after first time charging chemical conversion is placed on room temperature or high temperature and drying
In the environment of carry out aging, mainly there are three aspects for the purpose of aging: 1, the structural rearrangement that SEI film is close and hole is small is transformed into
Loose porous structure；2, the more acurrate stabilization of the voltage of battery after aging；3, electrolyte can further infiltrate pole piece,
Be conducive to the stabilization of battery performance.
Correlative study is thought that SEI is reacted with Li+ by the additives such as VC, EC and PC equal solvent, trace water and HF etc. and is formed
A series of organic lithium salts and inorganic lithium salt are covered on cathode graphite surface, and correlative study shows during formation charging, first
The film for additive such as VC form prior to PC, EC equal solvent in 2.4V~2.8V (full battery) generation reduction reaction certain thickness
SEI film is to prevent PC and Li+It is embedded in graphite altogether, vital influence is generated on electrical properties such as battery capacity, service life；Voltage into
One step increases, and EC equal solvent occurs reduction reaction and forms complete SEI film, then carries out aging and obtains stable SEI film.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of chemical synthesizing methods of ferric phosphate lithium cell, so that LiFePO4 is electric
Pond by chemical conversion after formed stablize effective SEI film.
The technical solution of the present invention is as follows:
A kind of chemical synthesizing method of ferric phosphate lithium cell, has specifically included following steps:
(1), the battery for completing high temperature infiltration after fluid injection is circulated to formation device, is stood, is then used first
The multiplying power electric current of 0.01-0.02C charges, and charging is set as 2.8V by voltage；
(2), battery is circulated and carries out a high temperature ageing to high-temperature aging room；
(3), the battery after a high temperature ageing is circulated to formation device, is stood first, then use 0.01-
The multiplying power electric current of 0.02C charges, and charging by voltage is set as 3.2V, finally using the multiplying power electric current of 0.05-0.2C into
Row charging, charging are set as 3.3V by voltage；
(4), battery is circulated and carries out secondary high-temperature aging to high-temperature aging room；
(5), battery is subjected to vacuumizing and exhausting, fluid infusion and sealing and completes battery production, finally carry out downstream capacity screening
And electrical property sampling observation test.
In the step (1), the battery standing time is 1-2h, and the environment temperature of formation device maintains 25-30 DEG C, environment
Dew-point temperature maintains < -20 DEG C.
In the step (2), the environment temperature of high-temperature aging room maintains 40-45 DEG C, and ambient dew point temperature maintains <-
40 DEG C, a high temperature ageing time is 4-8h.
In the step (3), the battery standing time is 1-2h, and the environment temperature of formation device maintains 25-30 DEG C, environment
Dew-point temperature maintains < -20 DEG C.
In the step (4), the environment temperature of high-temperature aging room maintains 40-45 DEG C, and ambient dew point temperature maintains <-
40 DEG C, secondary high-temperature ageing time is 6-12h.
In the step (5), the time of vacuumizing and exhausting is 300s, vacuum degree < -95KPa.
Advantages of the present invention:
(1), the battery core temperature that the present invention completes the infiltration of electrolyte high temperature is higher than environment temperature, first when entering formation device
By battery standing to environment temperature, guarantee the stability of temperature during SEI early period film is formed；
(2), by grasping and analysing in depth the formation mechenism of SEI film, the present invention tentatively restores to be formed in additives such as VC
A high temperature ageing is carried out after SEI film, then completes subsequent chemical conversion and secondary high-temperature aging, and double aging guarantees that SEI film is formed
Stability and completeness；
(3), the battery of high temperature ageing of present invention completion is when entering formation device first by battery standing to environment temperature
Degree guarantees the stability of temperature during SEI early period film is formed；
The SEI film that the present invention forms lithium battery is more stable and complete, and battery cycle life and storage can be improved
Energy.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
Embodiment 1
A kind of chemical synthesizing method of ferric phosphate lithium cell, has specifically included following steps:
(1), then the battery circulation that high temperature infiltration is completed after fluid injection is used to formation device, first standing 1-2h
The multiplying power electric current of 0.01-0.02C charges, and charging is set as 2.8V by voltage；Wherein, the environment temperature dimension of formation device
It holds at 25-30 DEG C, ambient dew point temperature maintains < -20 DEG C
(2), battery is circulated and carries out a high temperature ageing 4-8h to high-temperature aging room；Wherein, the environment of high-temperature aging room
Temperature maintains 40-45 DEG C, and ambient dew point temperature maintains < -40 DEG C；
(3), by the battery circulation after a high temperature ageing to formation device, first standing 1-2h, 0.01- is then used
The multiplying power electric current of 0.02C charges, and charging by voltage is set as 3.2V, finally using the multiplying power electric current of 0.05-0.2C into
Row charging, charging are set as 3.3V by voltage；Wherein, the environment temperature of formation device maintains 25-30 DEG C, ambient dew point temperature
Degree maintains < -20 DEG C；
(4), battery is circulated and carries out secondary high-temperature aging 6-12h to high-temperature aging room；Wherein, the environment of high-temperature aging room
Temperature maintains 40-45 DEG C, and ambient dew point temperature maintains < -40 DEG C；
(5), battery is carried out to vacuumizing and exhausting 300s, fluid infusion and sealing in the environment of vacuum degree < -95KPa and completes electricity
Pond production finally carries out downstream capacity screening and electrical property sampling observation test.
Embodiment 2
A kind of chemical synthesizing method of ferric phosphate lithium cell, has specifically included following steps:
(1), the battery that high temperature infiltration is completed after fluid injection is circulated to formation device, using the multiplying power electric current of 0.01-0.02C
It charges, charging is set as 2.8V by voltage；Wherein, the environment temperature of formation device maintains 25-30 DEG C, ambient dew point
Temperature maintains < -20 DEG C
(2), battery is circulated and carries out a high temperature ageing 4-8h to high-temperature aging room；Wherein, the environment of high-temperature aging room
Temperature maintains 40-45 DEG C, and ambient dew point temperature maintains < -40 DEG C；
(3), it by the battery circulation after a high temperature ageing to formation device, is carried out using the multiplying power electric current of 0.01-0.02C
Charging, charging are set as 3.2V by voltage, are finally charged using the multiplying power electric current of 0.05-0.2C, charge by voltage
It is set as 3.3V；Wherein, the environment temperature of formation device maintains 25-30 DEG C, and ambient dew point temperature maintains < -20 DEG C；
(4), battery is circulated and carries out secondary high-temperature aging 6-12h to high-temperature aging room；Wherein, the environment of high-temperature aging room
Temperature maintains 40-45 DEG C, and ambient dew point temperature maintains < -40 DEG C；
(5), battery is carried out to vacuumizing and exhausting 300s, fluid infusion and sealing in the environment of vacuum degree < -95KPa and completes electricity
Pond production finally carries out downstream capacity screening and electrical property sampling observation test.
Embodiment 3
(1), then the battery circulation that high temperature infiltration is completed after fluid injection is used to formation device, first standing 1-2h
The multiplying power electric current of 0.01-0.02C charges, and charging is set as 3.2V by voltage, finally using the multiplying power electricity of 0.05-0.2C
Stream charges, and charging is set as 3.3V by voltage；Wherein, the environment temperature of formation device maintains 25-30 DEG C, environment dew
Point temperature maintains < -20 DEG C；
(2), battery is circulated and carries out high temperature ageing 6-12h to high-temperature aging room；Wherein, the environment temperature of high-temperature aging room
40-45 DEG C is maintained, ambient dew point temperature maintains < -40 DEG C；
(3), battery is carried out to vacuumizing and exhausting 300s, fluid infusion and sealing in the environment of vacuum degree < -95KPa and completes electricity
Pond production finally carries out downstream capacity screening and electrical property sampling observation test.
Embodiment 4
(1), the battery that high temperature infiltration is completed after fluid injection is circulated to formation device, using the multiplying power electric current of 0.01-0.02C
Charge, charging by voltage is set as 3.2V, finally charged using the multiplying power electric current of 0.05-0.2C, charging by
Voltage is set as 3.3V；Wherein, the environment temperature of formation device maintains 25-30 DEG C, and ambient dew point temperature maintains < -20
℃；
(2), battery is circulated and carries out high temperature ageing 6-12h to high-temperature aging room；Wherein, the environment temperature of high-temperature aging room
40-45 DEG C is maintained, ambient dew point temperature maintains < -40 DEG C；
(3), battery is carried out to vacuumizing and exhausting 300s, fluid infusion and sealing in the environment of vacuum degree < -95KPa and completes electricity
Pond production finally carries out downstream capacity screening and electrical property sampling observation test.
The battery of embodiment 1-4 is subjected to 1C normal temperature circulation electric performance test and 55 DEG C of full electric high temperature storage tests, test
As a result statistics is as follows:
From the experimental result of upper table it is found that being to stand cooling and twice-aged technique before taking chemical conversion using embodiment 1
Battery cycle life and storage performance are obviously improved.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (6)
1. a kind of chemical synthesizing method of ferric phosphate lithium cell, it is characterised in that: specifically included following steps:
(1), the battery for completing high temperature infiltration after fluid injection is circulated to formation device, is stood first, then use 0.01-
The multiplying power electric current of 0.02C charges, and charging is set as 2.8V by voltage；
(2), battery is circulated and carries out a high temperature ageing to high-temperature aging room；
(3), the battery after a high temperature ageing is circulated to formation device, is stood first, then use 0.01-0.02C
Multiplying power electric current charge, charging by voltage is set as 3.2V, is finally filled using the multiplying power electric current of 0.05-0.2C
Electricity, charging are set as 3.3V by voltage；
(4), battery is circulated and carries out secondary high-temperature aging to high-temperature aging room；
(5), battery is subjected to vacuumizing and exhausting, fluid infusion and sealing and completes battery production, finally carry out downstream capacity screening and electricity
Performance sampling observation test.
2. a kind of chemical synthesizing method of ferric phosphate lithium cell according to claim 1, it is characterised in that: in the step (1),
The battery standing time is 1-2h, and the environment temperature of formation device maintains 25-30 DEG C, and ambient dew point temperature maintains < -20 DEG C.
3. a kind of chemical synthesizing method of ferric phosphate lithium cell according to claim 1, it is characterised in that: in the step (2),
The environment temperature of high-temperature aging room maintains 40-45 DEG C, and ambient dew point temperature maintains < -40 DEG C, a high temperature ageing time
For 4-8h.
4. a kind of chemical synthesizing method of ferric phosphate lithium cell according to claim 1, it is characterised in that: in the step (3),
The battery standing time is 1-2h, and the environment temperature of formation device maintains 25-30 DEG C, and ambient dew point temperature maintains < -20 DEG C.
5. a kind of chemical synthesizing method of ferric phosphate lithium cell according to claim 1, it is characterised in that: in the step (4),
The environment temperature of high-temperature aging room maintains 40-45 DEG C, and ambient dew point temperature maintains < -40 DEG C, secondary high-temperature ageing time
For 6-12h.
6. a kind of chemical synthesizing method of ferric phosphate lithium cell according to claim 1, it is characterised in that: in the step (5),
The time of vacuumizing and exhausting is 300s, vacuum degree < -95KPa.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888401A (en) * | 2019-04-16 | 2019-06-14 | 上海卡耐新能源有限公司 | A kind of chemical synthesizing method solving soft lithium ion packet power battery exception |
| CN110380034A (en) * | 2019-07-23 | 2019-10-25 | 合肥国轩高科动力能源有限公司 | A positive electrode material for a lithium-ion battery, a full battery containing the same, and a method for making the same |
| CN111106405A (en) * | 2019-12-17 | 2020-05-05 | 上海电气国轩新能源科技有限公司 | Formation method of square aluminum shell lithium iron phosphate battery for energy storage |
| CN111987376A (en) * | 2020-07-23 | 2020-11-24 | 法珞斯(苏州)能源科技有限公司 | Iron-lithium battery and its chemical composition and aging process |
| CN112255558A (en) * | 2019-12-31 | 2021-01-22 | 蜂巢能源科技有限公司 | Method and device for calculating battery calendar life attenuation |
| CN112751098A (en) * | 2021-01-25 | 2021-05-04 | 唐山航天万源科技有限公司 | Formation method of lithium iron phosphate battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109888401A (en) * | 2019-04-16 | 2019-06-14 | 上海卡耐新能源有限公司 | A kind of chemical synthesizing method solving soft lithium ion packet power battery exception |
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| CN111106405A (en) * | 2019-12-17 | 2020-05-05 | 上海电气国轩新能源科技有限公司 | Formation method of square aluminum shell lithium iron phosphate battery for energy storage |
| CN111106405B (en) * | 2019-12-17 | 2021-06-22 | 上海电气国轩新能源科技有限公司 | Formation method of square aluminum shell lithium iron phosphate battery for energy storage |
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| CN111987376A (en) * | 2020-07-23 | 2020-11-24 | 法珞斯(苏州)能源科技有限公司 | Iron-lithium battery and its chemical composition and aging process |
| CN111987376B (en) * | 2020-07-23 | 2024-11-15 | 法珞斯(苏州)能源科技有限公司 | Lithium iron battery and its formation, aging and capacity separation process |
| CN112751098A (en) * | 2021-01-25 | 2021-05-04 | 唐山航天万源科技有限公司 | Formation method of lithium iron phosphate battery |
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