负极对锂离子电池电液浸润及电性能的影响

Influence of anode on LIB electrode plate wettability and electrical performance

通过电解液浸润性测试及压汞分析方法表征评估了负极活性物质对极片电解液浸润性、电池陈化时间和倍率放电性能的影响。结果表明:不同形貌及粒径的负极活性物质对极片的浸润性、陈化时间以及电池倍率性能有显著影响。原材料的粒径越大,越接近于球形,其电解液渗透速率越大,浸润时间越短;采用不同形貌、不同体密度的负极活性物质,电池的陈化工艺时间需要有所差异;通过改变负极活性物质的形貌,可以有效改善电池的倍率放电性能。

The influence of negative electrode active material on electrolyte infiltration of the electrode plate, battery aging time and battery rate performance by electrolyte infiltrating test and mercury penetration analysis was assessed. According to the result, anode active materials with different morphologies and particle sizes affect the wettability of the electrode plate, battery aging time and battery rate performance markedly. Larger material particle size and closer spherical shape lead to the increasing electrolyte osmotic rate and shorter infiltration time. Adopting negative electrode active materials with different morphologies and bulk density, battery aging techniques are different accordingly. By changing the shape of anode active material, the rate performance of battery can be improved effectively.