A positive electrode sheet, a secondary battery, and an electronic device

By adding phosphate ester compounds to the cathode material layer of lithium-ion batteries, residual alkali is neutralized and cathode film formation is promoted, thus solving the problem of excessive residual alkali content in the cathode material layer of ternary materials and improving the high-temperature cycle performance and thermal safety performance of lithium-ion batteries.

CN119673957BActive Publication Date: 2026-01-06NINGDE AMPEREX TECHNOLOGY LTD +1
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Patent Information

Application Number
CN202411783443.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-12-05
Publication Date
2026-01-06
Estimated Expiration
2044-12-05

AI Technical Summary

Technical Problem

When ternary materials are used as positive electrode active materials in lithium-ion batteries, excessive residual alkali content in the positive electrode material layer leads to high-temperature gas generation, interface adhesion, reduced initial efficiency, decreased cycle performance, and thermal safety risks.

Method used

Adding phosphate ester compounds as the first compound to the positive electrode material layer neutralizes residual alkali through infrared spectrum characteristic peaks, reducing the residual alkali content on the surface of the positive electrode material layer. It also forms a film on the negative electrode through C=C unsaturated bonds, reducing side reactions and improving the thermal stability of the positive electrode interface.

Benefits of technology

It improves the high-temperature cycle performance of lithium-ion batteries, while taking into account low-temperature performance and impedance performance, enhances the thermal stability of the positive electrode interface, and strengthens the thermal safety performance of secondary batteries.

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Abstract

The application provides a positive electrode sheet, a secondary battery and an electronic device, comprising a positive electrode current collector and a positive electrode material layer located on at least one surface of the positive electrode current collector, the positive electrode material layer comprising a positive electrode active material and a first compound, the first compound comprising at least one of ethylene phosphate, allyl phosphate, vinylidene phosphate, diallyl phosphate, phenylethylene phosphate, diphenyl phosphate or diphenyl ethylene phosphate, and the infrared spectrum of the positive electrode material layer has infrared characteristic peaks at any two of 1150 cm ‑1 ±10 cm ‑1 , 1085 cm ‑1 ±10 cm ‑1 , 1600 cm ‑1 ±10 cm ‑1 , 1640 cm ‑1 ±10 cm ‑1 or 1500 cm ‑1 ±10 cm ‑1 . Through the above setting, the high-temperature cycle performance and thermal safety performance of the secondary battery are improved, and the low-temperature and impedance performance are considered.
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