LITHIUM-ION BATTERY

By optimizing the molar ratio of LiFSI to DMeTFSA in the electrolyte solution, the lithium-ion battery's cycle characteristics are enhanced through a more stable SEI formation, addressing the cracking issue in silicon-based anode materials.

DE102025150243A1Undetermined Publication Date: 2026-07-09TOYOTA JIDOSHA KK
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Applications
Current Assignee / Owner
TOYOTA JIDOSHA KK
Filing Date
2025-12-03
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Existing lithium-ion batteries with silicon-based anode active materials and electrolyte solutions containing LiFSI and DMeTFSA do not adequately improve cycle characteristics due to cracking of the solid electrolyte interface (SEI) caused by the expansion and contraction of the silicon-based anode active material during charging and discharging.

Method used

A lithium-ion battery design with a specific molar ratio of lithium bis(fluorosulfonyl)imide (LiFSI) to N,N-dimethyltrifluoromethanesulfonamide (DMeTFSA) in the electrolyte solution, ranging from 1/16 to 1/4, which forms a less prone to cracking SEI, thereby improving cycle characteristics.

Benefits of technology

The specified molar ratio of LiFSI to DMeTFSA in the electrolyte solution enhances the battery's cycle characteristics by maintaining the integrity of the SEI, leading to improved discharge capacity retention and average current efficiency.

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Abstract

A lithium-ion battery according to the present disclosure comprises an anode active material layer, a separator layer, and a cathode active material layer in the specified order, and the anode active material layer, the separator layer, and the cathode active material layer are impregnated with an electrolyte solution. The anode active material layer contains a silicon-based anode active material. The electrolyte solution contains (A) lithium bis(fluorosulfonyl)imide and (B) N,N-dimethyltrifluoromethanesulfonamide. The molar ratio of component (A) to component (B) is 1 / 16 or more and 1 / 4 or less, respectively.
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