An electrolyte and its lithium-ion battery
By adding a compound A with a specific structure to the electrolyte of lithium-ion batteries, HF is captured and a stable electrode interface film is formed, which solves the problems of poor high-temperature cycling and storage performance of lithium-ion batteries under high voltage, and improves the high-temperature stability and lifespan of the batteries.
CN115207466BActive Publication Date: 2026-05-26HIGHPOWER TECH HUIZHOU
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HIGHPOWER TECH HUIZHOU
- Filing Date
- 2022-07-13
- Publication Date
- 2026-05-26
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Figure CN115207466B_ABST
Abstract
This invention discloses an electrolyte and its lithium-ion battery, comprising a lithium salt, an organic solvent, and an additive; the additive includes at least compound A, the content of which is 0.5% to 8% of the total weight of the electrolyte; the general structural formula of compound A is as follows: In formula I, at least one of R1, R2, and R3 is an alkoxyalkyl group with 1 to 20 carbon atoms, at least one of which is O-TMS, and the remaining one is selected from one of an alkoxyalkyl group with 1 to 20 carbon atoms, CN-, -CH2C, -CH2CH2CN, -CH2CH2CH2CN, -CH2CH2CH2CH2CN, and O-TMS, wherein TMS is Si-(CH3)3. In this invention, compound A is added to the electrolyte, and the PF5 generated from LiPF6 in the electrolyte reacts with trace amounts of water to generate HF. The HF is cleared by the siloxane functional groups in compound A, wherein the fluoride (F... ‑ ) is captured by silicon (Si) to generate TMSF, H + It is also captured by oxygen (O) to form HPO, thereby improving high-temperature cycling performance and high-temperature storage performance under high voltage.
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