Battery
AssigneeGelion Technologies Pty Ltd
InventorsJacob LOCKE, Sebastien LIATARD, James DIBDEN
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Abstract
An electrochemical cell comprising: an anode comprising lithium or sodium metal, or lithium or sodium metal alloy; an ionically conductive cathode comprising an electroactive sulfur material; and a liquid electrolyte comprising at least one lithium salt or at least one sodium salt, wherein the polysulfide solubility of the electrolyte is less than 500 mM.
Claims17
An electrochemical cell comprising:
- an anode comprising lithium or sodium metal, or lithium or sodium metal alloy;
- an ionically conductive cathode comprising an electroactive sulfur material;
- and
- a liquid electrolyte comprising at least one lithium salt or at least one sodium salt, wherein the polysulfide solubility of the electrolyte is less than 500 mM.
The cell of any preceding claim, wherein the cathode further comprises a solid electroconductive material comprising an electroconductive carbon material or an ionically conductive polymer.
The cell of any preceding claim, wherein the cathode contains from 1 to 60% by weight ionically conductive material based on the total weight of the cathode.
The cell of any preceding claim wherein the electroactive sulfur material comprises elemental sulfur or Li2S.
The cell of any preceding claim wherein the at least one lithium salt is selected from lithium hexafluoroarsenate LiAsF6, lithium hexafluorophosphate LiPF6, lithium perchlorate LiCLO4, lithium sulfate Li2SO4, lithium nitrate LiNO3, lithium trifluoromethanesulfonate LiOTf, lithium bis(trifluoromethane)sulfonimide LiTFSI, lithium bis(fluorosufonyl)imide LiFSI, lithium bis(oxalate)borate LiBOB, lithium difluoro(oxalate)borate LiDFOB, lithium bis(pentafluoroethanesulfonyl)imide LiBETI, lithium 2-trifluoromethyl-4,5-dicyanoimidazole LiTDI and combinations thereof.
The cell of any preceding claim wherein the electrolyte comprises a solvent selected from at least one of linear ethers, diethyl ether (DEE), tetrahydrofuran (THF), Dimethoxyethane (DME), Dioxolane (DIOX), Diglyme, dimethyl carbonate(DMC), ethyl methyl carbonate (EMC), ethylene carbonate (EC), propylene carbonate (PC), methyl formate (MF), ethyl formate (EF), methyl propionate (MP), ethyl acetate (EA) and methyl butyrate (MB), methyl ethyl ketone, acetonitrile (ACN), propionitrile (PN), isobutyronitrile (iBN), Dimethylformamide (DMF), Dimethylacetamide (DMAc), N-Methyl-2-pyrrolidone (NMP), Tetramethylurea (TMU), Dimethyl sulfoxide (DMSO), Trimethyl phosphate, Triethyl phosphate, Hexamethylphosphoramide, Toluene, Benzene, Heptane, Xylene and Dichloromethane;
- ionic liquids, fluorinated ethers, gels, and mixtures thereof.
The cell of any preceding claim wherein the saturation concentration is at least 80%, preferably at least 90%.
The cell of any preceding claim wherein the cathode further comprises a wherein the binder is preferably selected from at least one of PEO, PVDF, Nafion, polypyrole, polythiophene, polyaniline, polyacetylene, polyphenylene vinylene, poly(3,4-ethylenedioxythiophene) and polyphenylene sulphide.
The cell of any preceding claim, wherein the polysulfide solubility of the electrolyte is less than 400 mM, preferably less than 200 mM, for example less than 100 mM.
The cell of any preceding claim wherein the cell is a lithium-sulfur cell.
Dependencies are inferred from the claim text.