电解液中添加LiBOB改善LiMn2O4的高温性能

摘要

Adding lithium bisoxalatoborate( LiBOB) into electrolyte could improve high temperature performance of lithium manganese oxide ( LiMn2O4) by the research of galvanostatic charge-discharge and electrochemical impedance spectroscopy. When charged-discharged with 0.5 C in 3.0 ~ 4.2 V,the capacity retention rate was improved from 82.6% to 90.5% after 300 cycles at 45℃,improved from 73.0% to 88.6% after 400 cycles,improved from 76.5% to 87.0% after 300 cycles at 60℃.The solid electrolyte interface(SEI)film formation voltage was lowered to 2.0 V.%由恒流充放电和电化学阻抗等研究发现,向电解液中添加双草酸硼酸锂(LiBOB)能改善锰酸锂(LiMn2O4)的高温性能.以0.5 C在3.0～4.2V充放电,在45℃循环300次,容量保持率从82.6％提高到90.5％,循环400次,从73.0％提高到88.6％；在60℃循环300次,从76.5％提高到87.0％.固体电解质相界面(SEI)膜的初始形成电位降至2.0V.