锰酸锂电池正极材料晶体图像分析及性能测试

Crystal image analysis and performance test of cathode material for lithium manganese battery

由于尖晶石锰酸锂电池的锰易溶于电解液中,使电池的储藏性能差、循环寿命短,尤其在高温下(60℃以上)这种现象更为明显。由于锰酸锂的表面结构及其界面的反应对锰的溶解影响较大,为了减小其晶界的面积进而减少锰的溶解,利用计算机设计了一种类球形的锰酸锂颗粒,通过这一方法提高锰酸锂材料晶体结构的稳定性和高温循环性能。研究表明,所设计的类球形锰酸锂正极材料为原料制备成的电池具有较好的循环性能,常温下1 C放电循环2 000次后,电池容量保持率约为82%,在高温下进行500次循环后,容量保持率仍高达82%左右。

The manganese spinel lithium manganate battery was easy to dissolve in the electrolyte, so the battery storage performance was poor and life cycle was short, especially at high temperatures（above 60 ℃） this kind of phenomenon was more obvious. Due to the surface structure of lithium manganate and its interface reaction of manganese dissolution of larger, in order to reduce the grain boundary area and thus reduce the manganese dissolution, a type of spherical lithium manganate particles were designed by computer. Then the structure stability and high temperature cycling performance of manganese oxide crystal were improved. Research shows that, in the design of the spherical lithium manganate cathode material as the raw material for preparing a battery has good cycle performance, after discharge cycle for 2000 times at 1 C at room temperature, the capacity keeping rate of battery is about 82%, after 500 cycles at high temperature, the capacity retention rate is as high as 82%.