Secondary batteries and electrical devices

CN121394518BActive Publication Date: 2026-05-26CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2025-12-25
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In existing secondary batteries, silicon-based materials have a high expansion rate, which leads to the compression of the positive electrode sheet and the extrusion of electrolyte, affecting the electrolyte wetting effect of the positive electrode sheet, increasing internal resistance, and limiting the improvement of low-temperature performance.

Method used

By adding porous lithium transition metal oxides and olivine-containing lithium phosphates to the positive electrode, and controlling the filling area ratio of primary particles in the cross-section of secondary particles to 60%-85%, continuous capillary channels are formed, which improves electrolyte wetting performance and reduces internal resistance.

Benefits of technology

The low-temperature performance and energy density of the secondary battery were improved. By optimizing the particle size distribution and pore structure, the electrolyte wetting performance of the positive electrode was enhanced, the internal resistance was reduced, and the lithium-ion transport efficiency was improved.

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Abstract

This application provides a secondary battery and an electrical device. The secondary battery includes a positive electrode and a negative electrode. The negative electrode active layer of the negative electrode includes a silicon-based material, and the positive electrode active layer of the positive electrode includes a lithium transition metal oxide and a lithium-containing phosphate with an olivine structure. The lithium-containing phosphate includes secondary particles I formed from primary particles I. The secondary particles I have pores between the primary particles I and have a porous structure. In the cross-section of the secondary particles I, the area filled by the primary particles I accounts for 60%-85%. The secondary battery prepared by this application balances low-temperature performance and energy density.
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