Non-aqueous electrolyte and lithium ion battery thereof

By using a combination of fluorovinyl carbonate and fluorosulfonimide structural compound A in lithium-ion batteries, a stable SEI film is formed, which solves the problem of capacity attenuation and thickness growth of lithium-ion batteries at high temperatures, and improves the high-temperature circulation and storage performance of the battery.

CN120432644APending Publication Date: 2025-08-05HEFEI SMOOTHWAY ELECTRONIC MATERIALS CO LTD +2
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Patent Information

Application Number
CN202510605082.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-05-12
Publication Date
2025-08-05

AI Technical Summary

Technical Problem

When existing lithium-ion batteries use fluorovinyl carbonate (FEC) as additives, there are problems such as LiPF6 decomposition to produce PF5 or B-containing organic matter, which induces defluorescence, resulting in harmful acid substance HF, resulting in incomplete SEI, which in turn causes battery capacity attenuation and reduced calendar life.

Method used

A nonaqueous electrolyte containing fluorovinyl carbonate and Compound A with a fluorosulfonimide structure is used to form an inorganic SEI component with high lithium ion conductivity containing LiF and an organic SEI component rich in sulfonimide polymer, covering the silicon carbon negative electrode, reducing cell volume expansion, and removing HF through nitrogen atoms on Compound A to avoid corrosion of SEI alkaline components.

Benefits of technology

It improves the high-temperature cycling and high-temperature storage performance of lithium-ion batteries, reduces the growth of battery thickness, and improves the high-temperature cycling capacity retention rate and internal resistance growth rate of battery.

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Abstract

The invention discloses a non-aqueous electrolyte and a lithium ion battery thereof, and relates to the technical field of lithium ion batteries. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent and an additive, the additive comprises fluoroethylene carbonate and a compound A shown in a formula I, R1 and R2 are independently selected from hydrogen, substituted or unsubstituted C1-C12 alkyl, substituted or unsubstituted C2-C12 alkenyl and substituted or unsubstituted C2-C12 alkynyl, or R1 and R2 are combined to form a cyclic structure. The non-aqueous electrolyte contains fluoroethylene carbonate and an additive compound A with a fluorosulfonyl imide structure, so that the thickness increase of the battery can be effectively reduced, and the high-temperature cycle performance and the high-temperature storage performance of the lithium ion battery are improved. # imgabs0 #
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