启停锰酸锂电池表面材料改性及性能分析

Surface modification and performance analysis of start-stop lithium manganate battery

尖晶石型LiMn_2O_4作为启停电池的一种正极材料,因其价格低廉、环保无污染的特点受到汽车电气制造行业青睐,然而,该电池尚存在初始比容量较低、高温下循环使用容量衰减较快的问题。提高高温循环稳定性的一种常用方法就是对锰酸锂进行表面改性。主要通过在锰酸锂表面包覆诸如金属氧化物、含Li化合物、聚合物、金属、氟化物等化学物质显微图像来观察其变化,进而研究表面改性对其循环性能的影响。对比研究了不同的表面改性方法,分析其优缺点,并对此提出可行的改进方案。

Spinel LiMn2O4 as cathode material of start-stop battery,it is favored by the automotive electrical manufacturing industry,due to its low cost and environment friendly.However,the capacity of battery is low,and capacity decays fast in high temperature recycling.A common technique for improving high temperature recycling stability is modification of lithium manganate on the surface.This paper mainly studies that surface modification influences on the cycle performance through observing the changes of microscopic image after coating metal oxides such as Li,containing compounds,polymers,metals,fluoride and other chemical substances.The advantages and disadvantages of different surface modification methods are compared and analyzed,and the feasible improvement scheme is put forward.