Rechargeable battery and electric apparatus

By setting active layers of silicon-based and graphite materials on the negative electrode of the secondary battery and adjusting their resistance and porosity ratio, the problem of balancing energy density and charging capability of the secondary battery is solved, achieving a balance between high energy density and excellent charging capability.

WO2026118580A1 Publication Date: 2026-06-11CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
Filing Date
2025-09-01
Publication Date
2026-06-11

AI Technical Summary

⚠Technical Problem

Existing rechargeable batteries struggle to balance high energy density and excellent charging capabilities, especially in silicon-containing systems where the addition of silicon deteriorates the battery's charging performance.

⚗Method used

A first negative electrode active layer and a second negative electrode active layer are provided on both sides of the negative electrode sheet. The first negative electrode active layer is composed of a first silicon-based material, and the second negative electrode active layer is composed of a first graphite material. By adjusting the resistance ratio and porosity ratio of the two, a specific relationship is achieved in the fully discharged state to improve the comprehensive ability to conduct electrons and ions.

🎯Benefits of technology

This technology enables secondary batteries to achieve both high energy density and improved charging capacity. By optimizing the relationship between the resistance and porosity of the active layer, the conductivity of both is ensured to be comparable, thereby improving the overall charging capacity of the negative electrode.

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Abstract

A rechargeable battery and an electric apparatus. The rechargeable battery comprises an anode electrode sheet, which comprises an anode current collector, and a first anode active layer and a second anode active layer, which are located on two opposite sides of the anode current collector, wherein the first anode active layer comprises a first silicon-based material, and the second anode active layer comprises a first graphite material; and the resistance ρ1 of the first anode active layer and the resistance ρ2 of the second anode active layer satisfy: 1.8≤ρ1 / ρ2≤5.4, and in a fully discharged state, the porosity φ1 of the first anode active layer and the porosity φ2 of the second anode active layer satisfy: 1.1≤φ1 / φ2≤2.9.
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