材料科学
电化学
锰
阴极
热稳定性
电极
析氧
氧化还原
化学工程
氧化物
离子
锂(药物)
冶金
物理化学
化学
工程类
医学
有机化学
内分泌学
作者
Biao Li,Huijun Yan,Jianzhong Ma,Pingrong Yu,Dingguo Xia,Weifeng Huang,Wei Chu,Wu Zhang
标识
DOI:10.1002/adfm.201400436
摘要
Lithium‐rich manganese‐based layered oxides show great potential as high‐capacity cathode materials for lithium ion batteries, but usually exhibit a poor cycle life, gradual voltage drop during cycling, and low thermal stability in the highly delithiated state. Herein, a strategy to promote the electrochemical performance of this material by manipulating the electronic structure through incorporation of boracic polyanions is developed. As‐prepared Li[Li 0.2 Ni 0.13 Co 0.13 Mn 0.54 ](BO 4 ) 0.015 (BO 3 ) 0.005 O 1.925 shows a decreased M‐O covalency and a lowered O 2p band top compared with pristine Li[Li 0.2 Ni 0.13 Co 0.13 Mn 0.54 ]O 2 . As a result, the modified cathode exhibits a superior reversible capacity of 300 mA h g −1 after 80 cycles, excellent cycling stability with a capacity retention of 89% within 300 cycles, higher thermal stability, and enhanced redox couple potentials. The improvements are correlated to the enhanced oxygen stability that originates from the tuned electronic structure. This facile strategy may further be extended to other high capacity electrode systems.
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