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US20070072076A1 - Lithium-sulphur battery with high specific energy - Google Patents

Lithium-sulphur battery with high specific energy Download PDF

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US20070072076A1
US20070072076A1 US11/526,876 US52687606A US2007072076A1 US 20070072076 A1 US20070072076 A1 US 20070072076A1 US 52687606 A US52687606 A US 52687606A US 2007072076 A1 US2007072076 A1 US 2007072076A1
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lithium
electrolyte
sulphur
polysulphides
electric energy
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Vladimir Kolosnitsyn
Elena Karaseva
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Oxis Energy Ltd
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Oxis Energy Ltd
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Priority claimed from GB0519491A external-priority patent/GB2430542B/en
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Priority to US11/526,876 priority Critical patent/US20070072076A1/en
Assigned to OXIS ENERGY LIMITED reassignment OXIS ENERGY LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KARASEVA, ELENA, KOLOSNITSYN, VLADIMIR
Publication of US20070072076A1 publication Critical patent/US20070072076A1/en
Priority to US12/787,006 priority patent/US8647769B2/en
Priority to US14/146,944 priority patent/US9123975B2/en
Abandoned legal-status Critical Current

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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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/134—Electrodes based on metals, Si or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • 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
    • 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
    • H01M10/052—Li-accumulators
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • 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
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0568—Liquid materials characterised by the solutes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/136—Electrodes based on inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/137—Electrodes based on electro-active polymers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/581—Chalcogenides or intercalation compounds thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/581—Chalcogenides or intercalation compounds thereof
    • H01M4/5815—Sulfides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/60—Selection of substances as active materials, active masses, active liquids of organic compounds
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/13—Electrodes for accumulators with non-aqueous electrolyte, e.g. for lithium-accumulators; Processes of manufacture thereof
    • H01M4/133—Electrodes based on carbonaceous material, e.g. graphite-intercalation compounds or CFx
    • 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

Definitions

  • the present invention relates to electrochemical power engineering, in particular it relates to chemical sources of electric energy (cells or batteries) comprising negative electrodes made of alkali metals and positive electrodes comprising sulphur and/or sulphur-based non-organic or organic (including polymeric) compounds as an electrode depolarizer substance.
  • the lithium-sulphur electrochemical system has a high theoretical specific energy of 2600 Wh/kg (D. Linden, T. B. Reddy, Handbook of batteries, third ed., McGraw-Hill, New-York, 2001), and is therefore of great interest at present.
  • Specific energy is defined as the ratio of the energy output of a cell or battery to its weight, and is expressed in Wh/kg.
  • specific energy is equivalent to the term gravimetric energy density.
  • the practical specific energy of a typical chemical source of electric energy usually reaches 20-30% of the theoretical maximum value of the specific energy of the electrochemical system that is employed. This is because various auxiliary elements (the separator, the current collectors of the electrodes, the electrolyte and other components) of the battery contribute to its total weight in addition to the electrode depolarizers.
  • the auxiliary elements of the battery design do not themselves take part in the electrochemical reaction itself, but are provided so as to facilitate the reaction process and to promote normal functioning of the battery.
  • Embodiments of the present invention seek at least substantially to optimize the electrolyte quantity in lithium-sulphur cells, and thereby to improve their practical specific energy.
  • One embodiment includes a chemical source of electric energy comprising a positive electrode (cathode) including sulphur or sulphur-based organic compounds, sulphur-based polymeric compounds or sulphur-based inorganic compounds as a depolarizer, a negative electrode (anode) made of metallic lithium or lithium-containing alloys, and an electrolyte comprising a solution of at least one salt in at least one aprotic solvent, the chemical source of electric energy being configured to generate soluble polysulphides in the electrolyte during a first stage of a two stage discharge-process, characterised in that the quantity of sulphur in the depolariser and the volume of electrolyte are selected such that, after first stage discharge of the cathode, the concentration of the soluble polysulphides in the electrolyte is at least 70% of a saturation concentration of the polysulphides in the electrolyte.
  • the quantity of sulphur in the depolariser and the volume of electrolyte are selected such that, after complete discharge of the cathode, the concentration of the soluble lithium polysulphides in the electrolyte is from 70 to 90% of a saturation concentration of the polysulphides in the electrolyte.
  • the depolarizer includes sulphur, carbon black and polyethylene oxide.
  • the electrolyte includes a solution of one or several lithium salts selected from the group consisting of: lithium trifluoromethanesulphonate, lithium perchlorate, lithium trifluoromethanesulfonimide, lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium tetrachloroaluminate, tetraalkylammonium salt, lithium chloride, lithium bromide and lithium iodide; in one or several solvents selected from the group consisting of: dioxolane, tetrahydrofuran, dimethoxyethane, diglyme, triglyme, tetraglyme, dialkyl carbonates, sulfolane and butyrolactone.
  • lithium salts selected from the group consisting of: lithium trifluoromethanesulphonate, lithium perchlorate, lithium trifluoromethanesulfonimide, lithium hexafluorophosphate, lithium hexa
  • FIG. 1 is a plot showing the two stage discharge process of a lithium-sulphur battery of an embodiment of the present invention.
  • the specific energy of a chemical source of electric energy is determined by the theoretical specific energy of the selected electrochemical system, as well as by the weight of auxiliary components required to ensure the proper operation of the chemical source of electric energy (e.g. a separator, current collectors of electrodes, a binder, current conducting additives, an electrolyte and other components), and also by the degree (efficiency) of utilization of the depolarizer.
  • the weight of the auxiliary components generally makes up 70-80% of the total weight of the cell. In order to achieve improved specific energy characteristics, the weight of the auxiliary components must be reduced.
  • the weight of the electrolyte is a significant part of the total weight of the chemical source of electric energy.
  • the electrolyte performs supplementary functions in chemical sources of electric energy with solid depolarizers, for example supporting the electrochemical reaction process and providing ion transport between the electrodes. Therefore in such systems it is desirable to minimize the quantity of the electrolyte.
  • the electrolyte may consist of a salt solution in a liquid depolarizer (for example a solution of lithium tetrachloroaluminate in thionyl chloride), or a salt solution in a mixture of a liquid depolarizer and an aprotic solvent (for example a solution of lithium bromide in a mixture of sulphurous anhydride and acetonitrile), or a salt solution in a solution of a liquid depolarizer in an aprotic solvent (for example a lithium perchlorate solution in a solution of lithium polysulphide in tetrahydrofuran) (D. Linden, T. B. Reddy: “Handbook of batteries”, third ed., McGraw-Hill, New York, 2001).
  • a liquid depolarizer for example a solution of lithium tetrachloroaluminate in thionyl chloride
  • a salt solution in a mixture of a liquid depolarizer and an aprotic solvent for example
  • the electrolyte in chemical sources of electric energy comprising liquid cathodes performs a wider range of functions than the electrolyte used in systems having solid cathodes.
  • the electrolyte not only supports the electrochemical reaction and ion transport between the electrodes, but serves as a solvent for a depolarizer of the positive electrode. Accordingly, when aprotic solvents are used as a component of a liquid cathode, the specific power characteristics of chemical sources of electric energy with liquid cathodes depend on the content of the aprotic solvents and hence on the content of the liquid cathode.
  • lithium-sulphur batteries are classified as batteries with liquid cathodes. This is because of the formation of well-soluble products, lithium polysulphides, that occur during charge and discharge of such batteries.
  • the liquid cathode is formed in lithium-sulphur batteries during discharge of the sulphur electrode.
  • the electrochemical oxidation of sulphur is realised by way of two stages. In the first stage, long-chain lithium polysulphides (which are well-soluble in aprotic electrolytes) are generated during the electrochemical oxidation of elemental sulphur, which is non-soluble or poorly soluble in most electrolyte systems (Equation 1).
  • Equation 1 S 8 +2e ⁇ ⁇ S 8 2 ⁇ S 8 2 ⁇ ⁇ S 6 2 ⁇ +1 ⁇ 4S 8 S 6 2 ⁇ ⁇ S 4 2 ⁇ +1 ⁇ 4S 8 Equation 1
  • the solution of lithium polysulphides in electrolyte which is formed in the initial discharge phase is known to be a liquid cathode.
  • the two stage mechanism of sulphur reduction is clearly seen in the discharge curves for lithium-sulphur batteries as shown in FIG. 1 . It is represented by two discharge regions: a first region in the voltage range from 2.5-2.4V to 2.1-1.9V corresponds to the first discharge phase (Equation 1); and a second region in the voltage range from 2.1-1.9V to 1.8-1.5V corresponds to the second (Equation 2).
  • the efficiency of sulphur utilization in lithium-sulphur batteries is determined by the quantitative ratio of sulphur to electrolyte.
  • This ratio depends on the properties of the electrolyte system. In particular, the ratio depends on the solubility of initial, intermediate and final compounds.
  • the electrolyte content in the batteries should be chosen in a way that provides complete dissolution of lithium polysulphides (formed at the first stage) with formation of liquid cathodes with moderate viscosity.
  • concentration of soluble polysulphides in the electrolyte is at least 70%, and preferably from 70 to 90%, of the saturation concentration at operating temperature and pressure.
  • the operating temperature may be approximately ⁇ 40 to +150 degrees Celsius. In another embodiment, the operating temperature may be approximately ⁇ 20 to +110 degrees C., or ⁇ 10 to +50 degrees C.
  • the operating pressure may be approximately 5 mmHg to 76000 mmHg (0.0066 to 100 atm). In another embodiment, the operating pressure may be approximately 20 mmHg to 38000 mmHg (0.026 to 50 atm), or for example approximately 1 atm.
  • Embodiments of the present invention may operate at standard temperature and pressure, for example at approximately 25 degrees C. and 1 atm.
  • Embodiments of the present invention may operate at other temperature and pressure ranges.
  • a chemical source of electric energy comprising a positive electrode (cathode) including sulphur or sulphur-based organic compounds, sulphur-based polymeric compounds or sulphur-based inorganic compounds as a depolarizer, a negative electrode (anode) made of metallic lithium or lithium-containing alloys, and an electrolyte comprising a solution of at least one salt in at least one aprotic solvent, the chemical source of electric energy being configured to generate soluble polysulphides in the electrolyte during a first stage of a two stage discharge process, characterised in that the quantity of sulphur in the depolariser and the volume of electrolyte are selected such that, after first stage discharge of the cathode, the concentration of the soluble polysulphides in the electrolyte is at least 70% of a saturation concentration of the polysulphides in the electrolyte.
  • the quantity of sulphur in the positive electrode and the volume of electrolyte are selected such that, after first stage discharge of the cathode, the concentration of the soluble polysulphides in the electrolyte is from 70 to 90% of a saturation concentration of the polysulphides in the electrolyte.
  • the depolarizer includes sulphur, carbon black and polyethylene oxide.
  • the electrolyte may comprise a solution of one or several lithium salts selected from the group consisting of: lithium trifluoromethanesulphonate, lithium perchlorate, lithium trifluoromethanesulfonimide, lithium hexafluorophosphate, lithium hexafluoroarsenate, lithium tetrachloroaluminate, tetraalkylammonium salt, lithium chloride, lithium bromide and lithium iodide; in one or several solvents selected from the group consisting of: dioxolane, tetrahydrofuran, dimethoxyethane, diglyme, triglyme, tetraglyme, dialkyl carbonates, sulfolane and butyrolactone.
  • lithium salts selected from the group consisting of: lithium trifluoromethanesulphonate, lithium perchlorate, lithium trifluoromethanesulfonimide, lithium hexafluorophosphate, lithium hex
  • a positive electrode comprising 70% elemental sublimed sulphur (available from Fisher Scientific, Loughborough, UK), 10% electroconductivity carbon black (Ketjenblack® EC-600JD, available from Akzo Nobel Polymer Chemicals BV, Netherlands) and 20% polyethylene oxide (PEO, 4,000,000 molecular weight, available from Sigma-Aldrich Company Ltd., Gillingham, UK) was produced by the following procedure.
  • a dry mixture of these components was ground in a high-speed Microtron® MB550 mill for 10-15 minutes. Then acetonitrile was added as a solvent to the dry mixture and the suspension was mixed for 15-20 hours with a DLH laboratory stirrer. The solids content of the suspension was 10-15%.
  • the suspension thus produced was applied by an automatic film applicator Elcometer® SPRL to one side of a 12 ⁇ m thick aluminium foil with an electroconductive carbon coating (Product No. 60303 available from Rexam Graphics, South Hadley, Mass.) as a current collector.
  • the coating was dried at ambient conditions for 20 hours and then in a vacuum at 50° C. for 5 hours.
  • the resulting dry cathode active layer had a thickness of 19 ⁇ m and contained 2.01 mg/cm 2 of cathode mixture.
  • the specific surface capacity of the electrode was 2.35 mA*h/cm 2 .
  • the positive electrode from the Example 1 was used in a small assembly cell made of stainless steel.
  • the cathode surface area was 5.1 cm 2 .
  • a pressure of 400 kg/cm 2 was applied to the electrode before it was used in the cell.
  • the cathode thickness after pressing was 16 ⁇ m.
  • a 1.0 M solution of lithium trifluoromethanesulphonate (available from 3M Corporation, St. Paul, Minn.) in sulfolane was used as an electrolyte.
  • Celgard® 2500 (a trade mark of Tonen Chemical Corporation, Tokyo, Japan, and also available from Mobil Chemical Company, Films Division, Pittsford, N.Y.) was used as a separator.
  • the cells were assembled as follows. The positive electrode was inserted into the cell. Then 4 microlitres of electrolyte were deposited onto the electrode by using a constant rate syringe CR-700 (Hamilton Co). The separator was placed on top of the wetted electrode and 3 microlitres of electrolyte were deposited onto the separator. Then a lithium electrode made of 38 ⁇ m thick lithium foil was placed on top of the separator. After the electrode stack was assembled, the cell was hermetically sealed by a lid containing a Teflon® coating or sealing.
  • the ratio of sulphur to electrolyte was 1 ml of electrolyte to 1 g of sulphur. After complete dissolution of the sulphur in the form of lithium polysulphide during discharge of the cell, the maximum sulphur concentration in the electrolyte was determined as 31.25 mole/litre.
  • Charge-discharge cycling of the cell was carried out at a current of 1.5 mA which was equivalent to a current density of 0.3 mA/cm 2 with a discharge cut-of voltage at 1.5V and charge termination at 2.8V.
  • the total weight of the cell and the weight distribution between elements of the cell are given in the Table 1, with properties of the cell being shown in Table 2.
  • the specific energy of the cell was calculated from the capacity at the second cycle by dividing the capacity by the weight of the electrode stack including the electrolyte.
  • a lithium-sulphur cell was assembled in the same way as described in Example 2, except in that 11 microlitres of electrolyte were deposited onto the positive electrode and 3 microlitres of electrolyte were deposited onto the separator.
  • the total electrolyte content in the cell was 14 microlitres, which amounts to 2 ml of electrolyte per 1 g of sulphur. Cycling of the cell was performed in the same way as in Example 2. The parameters of the cell are shown in Tables 3 and 4.
  • a lithium-sulphur cell was assembled in the same way as described in Example 2, except in that 22 microlitres of the electrolyte were deposited onto the positive electrode and 3 microlitres of electrolyte were deposited onto the separator.
  • the total electrolyte content of the cell was 25 microlitres, which corresponds to 3.5 ml of electrolyte per 1 g of sulphur. Cycling of the cell was performed in the same way as in Example 2. The parameters of the cell are shown in Tables 5 and 6.
  • a lithium-sulphur cell was assembled in the same way as described in Example 2, except in that 49 microlitres of electrolyte were deposited onto the positive electrode and 3 microlitres of electrolyte were deposited onto the separator.
  • the total electrolyte content of the cell was 52 microlitres, which is 5.2 ml of electrolyte per 1 g of sulphur. Cycling of the cell was performed in the same way as in Example 2. The parameters of the cell are shown in Tables 7 and 8.
  • a lithium-sulphur cell was assembled in the same way as described in Example 2, except in that 69 microlitres of electrolyte were deposited onto the positive electrode and 3 microlitres of electrolyte were deposited onto the separator. The total electrolyte content of the cell was 72 microlitres, which amounts to 7.2 ml of electrolyte per 1 g of sulphur. Cycling of the cell was performed in the same way as in Example 2. The parameters of the cell are shown in Tables 9 and 10.
  • the ultimate or saturation solubility of sulphur in the form of lithium octasulphide in 1.0 M solution of lithium trifluoromethanesulphonate in sulfolane was evaluated.
  • the evaluation of solubility was carried out in the following way: 1.0 g of a mixture of lithium sulphide and sulphur (the content of sulphur in the mixture was 0.86 g) was taken in a molar ratio 1:7 and placed in a sealed glass reactor in an air thermostat, the reactor being fitted with a mechanical blender and a metering device. The thermostat temperature was set to 30° C. A 1.0 M solution of lithium trifluoromethanesulphonate in sulfolane was added in small portions to the reactor under constant mixing.
  • FIG. 1 shows a non-limiting example of the dependence of specific energy of a bare lithium-sulphur cell versus the ratio of electrolyte:sulphur.
  • Other curves may be relevant to other embodiments. It can be seen that this dependence has a maximum which is reached at a ratio of electrolyte:sulphur close to 3. In other words, the maximum capacity of a lithium-sulphur cell is reached at a volume-weight ratio of electrolyte:sulphur that is close to the ultimate or saturation solubility of lithium octasulphide in electrolyte.

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US11/526,876 US20070072076A1 (en) 2005-09-26 2006-09-26 Lithium-sulphur battery with high specific energy
US12/787,006 US8647769B2 (en) 2005-09-26 2010-05-25 Lithium-sulphur battery with high specific energy
US14/146,944 US9123975B2 (en) 2005-09-26 2014-01-03 Lithium-sulphur battery with high specific energy

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US72106205P 2005-09-28 2005-09-28
US73432005P 2005-11-08 2005-11-08
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US8647769B2 (en) 2014-02-11
JP5947774B2 (ja) 2016-07-06
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US20100231168A1 (en) 2010-09-16
US9123975B2 (en) 2015-09-01
US20140120428A1 (en) 2014-05-01
JP2014067717A (ja) 2014-04-17
WO2007034243A1 (fr) 2007-03-29
KR20080053493A (ko) 2008-06-13
JP2009510684A (ja) 2009-03-12
JP5442257B2 (ja) 2014-03-12
EP1941568A1 (fr) 2008-07-09

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