尖晶石锰酸锂电池离子改性后的循环性能研究

Cycle performance research analysis of Li modified LiMn_2O_4

尖晶石结构的锰酸锂是通过电解二氧化锰(EMD)和碳酸锂高温固相合成的,合成后的锰酸锂与作为原材料之一的电解二氧化锰在颗粒粒度和形貌特征上很相似。实验发现,为了得到高温循环稳定性更好的锰酸锂,可以通过降低其中的超细颗粒以及增加锂含量使其改性这两种方式。结合这两种方式合成的改性锰酸锂材料,比容量低,且于50℃下循环170次后容量保持率高,约为87%,表现出良好的循环稳定性。

Spinel LiMn2O4 was synthesized by solid phase reaction under the high temperature with Electrolytic manganese dioxide and Lithium carbonate. LiMn2O4 with electrolytic manganese dioxide as one of raw materials were very similar on the grain size and morphology characteristics. Study found that, in order to get better high temperature cycle stability of LiMn2O4, it could be modified by reducing the amount of ultrafine particles and increasing the content of lithium. The modified LiMn2O4 was synthesized by these two ways, and it had low specific capacity and higher retention capacity of 87% after 170 cycles at 50 ℃.