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US 10,096,859 B2Granted
Electrolytes with ionic liquid additives for lithium ion batteries
AssigneeStoreDot Ltd.
InventorsDoron Burshtain, Nir Kedem, Daniel Aronov
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AssigneeStoreDot Ltd.
InventorsDoron Burshtain, Nir Kedem, Daniel Aronov
Estimating the term…
Electrolytes, anodes, lithium ion cells and methods are provided for preventing lithium metallization in lithium ion batteries to enhance their safety. Electrolytes comprise up to 20% ionic liquid additives which form a mobile solid electrolyte interface during charging of the cell and prevent lithium metallization and electrolyte decomposition on the anode while maintaining the lithium ion mobility at a level which enables fast charging of the batteries. Anodes are typically metalloid-based, for example include silicon, germanium, tin and/or aluminum. A surface layer on the anode bonds, at least some of the ionic liquid additive to form an immobilized layer that provides further protection at the interface between the anode and the electrolyte, prevents metallization of lithium on the former and decomposition of the latter.
An electrolyte for a lithium ion battery having an anode made of anode material particles and a cathode, said electrolyte consisting of carbonate containing electrolyte, at least one lithium salt and an additive present in an amount up to 10 volume percent of the electrolyte, the additive consisting of at least one ionic liquid which consists of cations and anions, wherein, while operating the battery:
An electrolyte for a lithium ion battery having an anode made of anode material particles and a cathode, said electrolyte consisting of carbonate containing electrolyte, at least one lithium salt and an additive present in an amount up to 10 volume percent of the electrolyte, the additive consisting of at least one ionic liquid which consists of cations and anions, wherein the at least one ionic liquid consists of at least one sulfonylimide, substituted or unsubstituted, and at least one piperidinium, substituted or unsubstituted, selected to have a melting temperature below 10° C.
Dependencies are inferred from the claim text.