负极极片、二次电池和电子装置
By designing negative electrode active materials with high density and high porosity in the negative electrode sheet, the problem of rapid temperature rise during high-rate discharge of secondary batteries was solved, thereby improving battery performance and reducing costs.
CN117859212BActive Publication Date: 2026-07-17NINGDE AMPEREX TECHNOLOGY LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- NINGDE AMPEREX TECHNOLOGY LTD
- Filing Date
- 2022-08-30
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
Existing secondary batteries experience rapid temperature rise during high-rate discharge, leading to damage. Current methods that reduce electrode coating thickness and decrease active material particle size reduce energy density and are costly.
Method used
The negative electrode active material designed for the negative electrode sheet combines high solid density and high porosity. By controlling the size and distribution of the pores, the wettability of the electrolyte and the diffusion of active ions are improved, and the migration impedance is reduced.
Benefits of technology
It improves the high-rate discharge performance of secondary batteries, reduces temperature rise, maintains energy density, and reduces costs.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN117859212B_ABST
Abstract
提供一种负极极片，其包括负极集流体和设置于负极集流体上的负极活性材料层，负极活性材料层包括负极活性材料，该负极活性材料包括具有孔的第一颗粒和除第一颗粒外的第二颗粒，其中，在所述负极活性材料层的截面的200μm×200μm区域内，所述第一颗粒满足：0.10≤a / b≤0.85且0.89≤0.98×C‑(a / b)2≤1.86；其中，aμm表示所述第一颗粒中孔的最大费雷特直径平均值；bμm表示所述第一颗粒的最大费雷特直径平均值；C g / cm3表示负极活性材料在5t压力下的压实密度，其中，1.65≤C≤1.95。本申请的负极极片兼具高压实密度与高孔隙率，进而能够在保证二次电池高能量密度的基础上，有效改善二次电池的阻抗及放电温升。还提供包括该负极极片的二次电池。
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