Electrolyte, secondary battery, and electric device

By using functional compounds containing phosphite, silicon and specific nitrogen-containing functional groups in the electrolyte of lithium metal batteries, the problem of oxidation reaction of traditional electrolyte during charging and discharging is solved, and the cycle performance and safety of the battery are significantly improved.

CN119725719AActive Publication Date: 2025-03-28CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202311279087.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-28
Publication Date
2025-03-28
Estimated Expiration
2043-09-28

AI Technical Summary

Technical Problem

The electrolyte of traditional lithium metal batteries is prone to oxidation reactions during charging and discharging, resulting in battery circulation and safety problems.

Method used

An electrolyte containing a functional compound of a specific structure, which contains a phosphite structure, a silicon-containing group and a specific nitrogen-containing functional group, is used, which can capture the oxidation product and promote the molding and toughness of the SEI film.

Benefits of technology

By capturing oxidation products and improving the toughness of SEI films, the circulation performance and safety of lithium metal batteries are significantly improved.

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Abstract

The invention relates to an electrolyte, a secondary battery and a power utilization device, the electrolyte comprises a functional compound shown in a formula (1), and T1-T3 are respectively and independently selected from any one of alkyl with the carbon atom number of 1-10, alkenyl with the carbon atom number of 2-10, alkynyl with the carbon atom number of 2-10 and groups shown in formulas (a)-(f); and at least one of T1-T3 is selected from the group represented by the formula (a), and at least one of T1-T3 is selected from the group represented by the formula (b), (c), (d) or (e). The functional compound shown in the formula (1) can capture oxidation products in the charging and discharging process of the electrolyte, meanwhile, the toughness of a formed SEI film is improved, and then the cycle performance of the secondary battery is improved.
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