超低温圆柱形磷酸铁锂电池的研发

Research on LiFePO_(4) Li-ion Battery Used in Super-Low Temperature

本文针对26650型圆柱电池的低温性能解决方案进行了系统研究。针对磷酸铁锂电池低温性能较差的特点,采用具有纳米片层结构的磷酸铁锂正极、具有硬碳结构的负极材料和低温电解液体系,应用高电导率炭黑添加剂,成功设计并制造出具有良好低温性能的26650圆柱磷酸铁锂锂离子电池。电池在-50℃可以实现96%的放电容量,且在-30℃的1C充放循环寿命达到100次以上。

The low temperature performance solution of type 26650 cylindrical cells was studied systematically.In view of the characteristics of poor low temperature performance of lithium iron phosphate,lithium iron phosphate cathode with nanosheet structure,negative materials with hard carbon structure and low-temperature electrolyte system,high conductivity carbon additives,system adhesive and thin coating design,26650 cylindrical lithium iron phosphate battery with good low temperature properties.The battery can achievea 96%discharge capacity at-50℃,and the life of 1C charge discharge cycle at-30℃can reach more than 100 times.