离子液体
电解质
电化学
循环伏安法
化学
电池(电)
锂(药物)
无机化学
锂离子电池
傅里叶变换红外光谱
化学工程
电极
有机化学
催化作用
物理化学
医学
功率(物理)
物理
量子力学
工程类
内分泌学
作者
Tao Dong,Suojiang Zhang,Liang Zhang,Shimou Chen,Xingmei Lü
摘要
Addressing capacity fading during electrochemical cycling is one of the most challenging issues of lithium-ion batteries based on LiMn2O4. Accordingly, in this work, an ester-functionalized ionic liquid, N-methylpyrrolidinium-N-acetate bis(trifluoromethylsulfonyl) imide ([MMEPyr][TFSI]), was designed as an additive to the electrolyte employed for Li/LiMn2O4 batteries to improve their electrochemical performance. A systematic comparative study was carried out using the LiTFSI-based electrolyte with and without [MMEPyr][TFSI] additive. After 100 cycles, the Li/LiMn2O4 half-cells retained 94 % of their initial discharge capacity in the electrolyte containing 10 wt-% [MMEPyr][TFSI]. However, the cycling capacity of the half-cells in the electrolyte without [MMEPyr][TFSI] decreased considerably to ~21 mAh g–1 within the first 10 cycles. One of the main reasons for the decrease is the stabilization of the Al current collector by the [MMEPyr][TFSI] additive, as demonstrated by scanning electron microscopy, cyclic voltammetry, and Fourier transform infrared spectroscopy. Moreover, the Li/LiMn2O4 cells in the electrolyte containing [MMEPyr][TFSI] displayed high-rate performance, whereby ~90 % of the cell initial discharge capacity was retained at 2.5C.
科研通智能强力驱动
Strongly Powered by AbleSci AI