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US 2024/0194949 A1Published application
Electrolyte compositions
AssigneeDyson Technology Limited
InventorsMatthew Robert ROBERTS, Liyu JIN, Yu HU, Alex MADSEN
Life of this patent
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Abstract
An electrolyte composition for a lithium ion battery. The composition includes 5-25 wt % of lithium salt, 2-10 wt % of additive and 65-93 wt % of solvent. The lithium salt includes 20-100 mol % of lithium 2-trifluoromethyl-4,5-dicyanoimidazolide or lithium bis(oxalato) borate or a mixture thereof, and 0-95 mol % lithium bis(fluorosulfonyl)imide. The additive includes 30-90 mol % fluoroethylene carbonate and 10-70 mol % vinylene carbonate. The solvent includes 70-90 mol % ethylene carbonate and 10-30 mol % propylene carbonate.
Claims10
1:
- An electrolyte composition for a lithium ion battery, the composition comprising 5-25 wt % of lithium salt, 2-10 wt % of additive and 65-93 wt % of solvent;
- and wherein
- (a) the lithium salt comprises 20-100 mol % of lithium 2-trifluoromethyl-4,5-dicyanoimidazolide or lithium bis(oxalato) borate or a mixture thereof, and 0-95 mol % lithium bis(fluorosulfonyl)imide;
- (b) the additive comprises 30-90 mol % fluoroethylene carbonate and 10-70 mol % vinylene carbonate;
- and
- (c) the solvent comprises 70-90 mol % ethylene carbonate and 10-30 mol % propylene carbonate.
3 more elements
2:
- The electrolyte composition according to claim 1, wherein the lithium concentration in the composition is between about 0.7M and 2.0M.
3:
- The electrolyte composition according to claim 1, wherein the lithium salt consists of 20-100 mol % of lithium 2-trifluoromethyl-4,5-dicyanoimidazolide or lithium bis(oxalato) borate or a mixture thereof, and 0-95 mol % lithium bis(fluorosulfonyl)imide.
4:
- The electrolyte composition according to claim 1, wherein the additive consists of 30-90 mol % fluoroethylene carbonate and 10-70 mol % vinylene carbonate.
5:
- The electrolyte composition according to claim 1, wherein the solvent consists of 70-90 mol % ethylene carbonate and 10-30 mol % propylene carbonate.
6:
- The electrolyte composition according to claim 1, the electrolyte composition selected from the group consisting of:
- a) 3.2 wt % lithium 2-trifluoromethyl-4,5-dicyanoimidazolide, 12.5 wt % lithium bis(fluorosulfonyl)imide, 19.4 wt % propylene carbonate, 58.2 wt % ethylene carbonate, 4.5 wt % vinylene carbonate and 2.2 wt % fluoroethylene carbonate;
- b) 1.6 wt % lithium 2-trifluoromethyl-4,5-dicyanoimidazolide, 14.0 wt % lithium bis(fluorosulfonyl)imide, 19.4 wt % propylene carbonate, 58.2 wt % ethylene carbonate, 4.5 wt % vinylene carbonate and 2.3 wt % fluoroethylene carbonate;
- c) 0.8 wt % lithium 2-trifluoromethyl-4,5-dicyanoimidazolide, 14.8 wt % lithium bis(fluorosulfonyl)imide, 19.4 wt % propylene carbonate, 58.2 wt % ethylene carbonate, 4.5 wt % vinylene carbonate and 2.3 wt % fluoroethylene carbonate;
- d) 3.2 wt % lithium bis(oxalato) borate, 12.5 wt % lithium bis(fluorosulfonyl)imide, 19.4 wt % propylene carbonate, 58.2 wt % ethylene carbonate, 4.5 wt % vinylene carbonate and 2.2 wt % fluoroethylene carbonate;
- e) 9.6 wt % lithium 2-trifluoromethyl-4,5-dicyanoimidazolide, 2.4 wt % lithium bis(oxalato) borate, 11.7 wt % lithium bis(fluorosulfonyl)imide, 17.5 wt % propylene carbonate, 52.7 wt % ethylene carbonate, 4.1 wt % vinylene carbonate and 2 wt % fluoroethylene carbonate;
- f) 3.2 wt % lithium bis(oxalato) borate, 20.3 wt % lithium bis(fluorosulfonyl)imide, 17.5 wt % propylene carbonate, 52.7 wt % ethylene carbonate, 4.1 wt % vinylene carbonate and 2 wt % fluoroethylene carbonate;
- g) 1.6 wt % lithium bis(oxalato) borate, 21.8 wt % lithium bis(fluorosulfonyl)imide, 17.5 wt % propylene carbonate, 52.7 wt % ethylene carbonate, 4.1 wt % vinylene carbonate and 2 wt % fluoroethylene carbonate;
- h) 0.8 wt % lithium bis(oxalato) borate, 22.6 wt % lithium bis(fluorosulfonyl)imide, 17.5 wt % propylene carbonate, 52.7 wt % ethylene carbonate, 4.1 wt % vinylene carbonate and 2 wt % fluoroethylene carbonate;
- and
- i) 3.2 wt % lithium 2-trifluoromethyl-4,5-dicyanoimidazolide, 1.6 wt % lithium bis(oxalato) borate, 18.7 wt % lithium bis(fluorosulfonyl)imide, 17.5 wt % propylene carbonate, 52.7 wt % ethylene carbonate, 4.1 wt % vinylene carbonate and 2 wt % fluoroethylene carbonate.
8 more elements
7:
- The electrolyte composition according to claim 6, wherein the electrolyte composition consists of 3.2 wt % lithium 2-trifluoromethyl-4,5-dicyanoimidazolide, 12.5 wt % lithium bis(fluorosulfonyl)imide, 19.4 wt % propylene carbonate, 58.2 wt % ethylene carbonate, 4.5 wt % vinylene carbonate and 2.2 wt % fluoroethylene carbonate.
8:
- An extruded battery component comprising the electrolyte composition according to claim 1.
9:
- A method of forming a battery component, including a processing step which requires heating the composition according to claim 1 to a temperature in excess of about 55° C.
10:
- The method according to claim 9, wherein the processing step includes extruding the composition.