Lithium secondary battery and electric device

CN119965358AActive Publication Date: 2025-05-09CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202510145942.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-10
Publication Date
2025-05-09
Estimated Expiration
2045-02-10

AI Technical Summary

Technical Problem

The charging capacity of lithium secondary batteries in low temperature environments decreases, resulting in poor fast charging performance.

Method used

Lithium iron phosphate salt particles including doped element Q are used as the positive electrode active material, and propylene carbonate and a compound of formula I with large Π bonds are added to the electrolyte to improve the low-temperature lithium ion liquid phase transfer speed and cycling stability of the electrolyte.

Benefits of technology

It improves the low-temperature fast charging performance and cycle stability of lithium secondary batteries, and at the same time enhances the structural stability and conductivity of the positive electrode active material.

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Abstract

The invention provides a lithium secondary battery and an electric device. The lithium secondary battery comprises a positive pole piece, a negative pole piece and an electrolyte, the positive pole piece comprises a positive current collector and a positive film layer arranged on at least one side of the positive current collector, the positive film layer comprises a positive active material, and the positive active material comprises lithium-containing transition metal phosphate particles; the lithium-containing transition metal phosphate particles comprise lithium iron phosphate particles, the lithium iron phosphate particles comprise a doping element Q, and the doping element Q comprises one or more of W, Al, Na, K, Mg, Cu, Mn, Cr, Zn, Pb, Ca, Co, Ni, Sr, Nb, V, Ti, B, S, Si, N, F, Cl, Br and Zr; the electrolyte comprises propylene carbonate and a compound with a formula I, R is selected from halogen, and n is an integer selected from 1-6. The lithium secondary battery provided by the invention has relatively good low-temperature fast-charging performance and also has excellent cycling stability.
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Citation Information

Patent Citations

  • Anode material made of doped lithium-iron phosphate active material and carbon and method for producing the same

    CN101212049A

  • Long-cycle-life lithium iron phosphate battery and preparation method thereof

    CN111342145A

  • Positive electrode material and preparation method thereof, positive plate and lithium ion battery

    CN113555537A

  • Preparation method and application of lithium iron phosphate battery with long cycle life

    CN114069054A

  • Graphite negative electrode PC-based electrolyte, preparation method thereof, lithium ion battery and application

    CN115377500A

Cited By

  • Battery cell, battery device and electric device

    CN121215859A

  • Lithium iron phosphate material and preparation thereof, positive plate, battery, battery pack and electric equipment

    CN121439781A

  • Lithium secondary battery and electrical device

    WO2026166217A1