Secondary battery, negative pole piece and electric device
By using polyrotaxane as a binder in the conductive coating of the secondary battery, the problem of uneven sodium deposition was solved, the cycle stability and safety of the battery were improved, and the growth of metal dendrites was suppressed.
CN121506960APending Publication Date: 2026-02-10CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information
- Application Number
- CN202511649743.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-06-15
- Publication Date
- 2026-02-10
AI Technical Summary
Technical Problem
In sodium-metal batteries without a negative electrode, sodium deposition is uneven during cycling, forming sodium dendrites, which leads to poor cycle stability and poses safety hazards.
Method used
A conductive coating containing polyrotaxane as a binder is used. Polyrotaxane is composed of linear and cyclic molecules. The cyclic molecules can rotate freely to form a highly elastic polymer network, which serves as a nucleation layer for the deposition of metals such as sodium and lithium, and inhibits the growth of metal dendrites.
Benefits of technology
It improves the cycle performance and safety performance of secondary batteries, suppresses the growth of metal dendrites, and prevents battery short circuits and thermal runaway.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention relates to a secondary battery, a negative pole piece and an electric device. The secondary battery comprises a negative pole piece, the negative pole piece comprises a negative current collector and a conductive coating arranged on at least one surface of the negative current collector, the conductive coating comprises a conductive agent and a first binder, and the first binder comprises polyrotaxane.
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