Non-aqueous electrolyte and batteries containing the same

EP4771694A1Pending Publication Date: 2026-07-08EAGLEPICHER TECHNOLOGIES LLC
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Patent Information

Authority / Receiving Office
EP · EP
Patent Type
Applications
Current Assignee / Owner
EAGLEPICHER TECHNOLOGIES LLC
Filing Date
2024-08-28
Publication Date
2026-07-08

AI Technical Summary

Technical Problem

Lithium-ion batteries face challenges in maintaining effective performance at low temperatures, as cold conditions increase electrolyte viscosity, lower lithium ion conductivity, and can cause the electrolyte to freeze, inhibiting lithium ion mobility.

Method used

A non-aqueous electrolyte composition for lithium-ion cells, including a base electrolyte of lithium hexafluorophosphate or lithium bis(fluorosulfonyl)imide in methyl propionate, with additives such as vinylene carbonate and lithium difluorophosphate, which improves conductivity and stability at low temperatures.

Benefits of technology

The described non-aqueous electrolyte achieves superior battery performance at temperatures as low as -60°C while maintaining good cycle life at ambient temperatures, significantly outperforming conventional batteries that often become inoperable below -20°C.

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Abstract

A. non-aqueous electrolyte for a lithium-ion cell includes a base electrolyte consisting of lithium hexafluorophosphate or lithium bis(tluorosulfonyl)imide or a combination thereof in methyl propionate; about 2 to about 15 parts by weight, preferably about 6 to about 15 parts by weight of vinylene carbonate; and about 0.5 to about 5 parts by weight, preferably about 2. to about 5 parts by weight of an additive comprising lithium difluorophosphate, lithium difluoro(oxalate)borate, lithium bis(oxalate)borate, or a combination thereof, wherein the content of the vinylene carbonate and. the additive are each based on a total weight of the base electrolyte, the vinylene carbonate, and the additives.
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