电容式钛酸锂电池的设计及制备方法

Design and Preparation Method of Capacitive Lithium-Titanate Battery

为解决现有钛酸锂电池在低温下电池容量衰减和充放电过程中的电池胀气问题,从电池内外部结构和制备工艺流程两方面提出新型钛酸锂电池结构设计.在电池内部模仿电容式结构,融合电容器的物理储能方式和蓄能电池的化学储能方式,提升电池在低温环境下的充放电性能.在制备工艺上采取柱形锂离子电池含浸新技术,提高含浸效率,减少电池内部水分,部分解决电池胀气问题,并进行相关性能测试.结果表明,新型钛酸锂电池容量保持率可在9 548次充放电循环下达到92.5%,低温环境下电池容量保持率大于75%,该方法有效提升了钛酸锂电池性能.

In order to solve the problem of battery bulging and capacity fading,this paper proposes an innovative battery capacitor structure and the related preparation process.This method integrates the physical energy storage method of the capacitor and the chemical energy storage method of the energy storage battery.In the preparation process,a novel technology of columnar lithium-ion battery soaking is adopted,which improves the soaking efficiency and reduces the internal moisture of the battery.The related performance tests show that the capacity retention rate of the new lithium-titanate battery can reach 92.5%after 9548 cycles,and the battery capacity can be maintained above 75%at a low temperature.The proposed method provides an effective means for improving the performance of the lithium-titanate battery.