尖晶石
材料科学
锰酸盐
电化学
阴极
溶解
化学工程
氧气
锰
锂(药物)
煅烧
空位缺陷
无机化学
电池(电)
电极
冶金
热力学
物理化学
结晶学
催化作用
化学
有机化学
功率(物理)
内分泌学
工程类
物理
医学
生物化学
作者
Yan Ren,Jiayi He,Shengyu Jiang,Rui He,Qi Liang,Bin Zhu,Yanfen Wen,Shuxin Zhuang
标识
DOI:10.1016/j.matlet.2023.135765
摘要
Octahedral spinel lithium manganate dioxide (LiMn2O4, LMO) achieves remarkable electrochemical properties, but manganese dissolution during extended cycling process still cannot be well avoided. Herein, the oxygen vacancies within LiMn2O4 can be effectively modulated by extending the calcination duration. The density functional theory (DFT) calculation and experiments verified that appropriate oxygen vacancy not only promotes the structural stability, but also accelerates the charge transfer to improve the cycle performance under high C rate. Among them, the LMO sintered at 750 °C for 10 h (LMO-10) presented prominent electrochemical performance, delivering 114.58 mAh/g with the capacity retention rate of 95.90 % after 500 cycles at 5C, while the unmodified sample only exhibits 64.46 mAh/g with low retention of 63.75 %. This highly effective and facile approach to manipulate oxygen vacancy of spinel LiMn2O4 would facilitate to develop advanced cathode materials for lithium-ion batteries.
科研通智能强力驱动
Strongly Powered by AbleSci AI