Enhanced Electrochemical Performance of LiNi0.6Co0.2Mn0.2O2 by a Negative-Thermal-Expansion Material at Elevated Temperature

被引：7
作者：
Xu, Sheng [1 ]
Jing, Nana [1 ]
Hao, Huming [1 ]
Wang, Mengyao [1 ]
Wang, Zhiqiang [1 ]
Yang, Liangxuan [1 ]
Wang, Guan [1 ]
Chen, Jianyue [1 ]
Wang, Guixin [1 ]
机构：
[1] Sichuan Univ, Sch Chem Engn, Chengdu 610065, Peoples R China
来源：
ENERGY TECHNOLOGY | 2021年 / 9卷 / 08期
基金：
中国国家自然科学基金;
关键词：
cathode materials; electrochemical performances; LiNi0; 6Co0; 2Mn0; 2O2; negative thermal expansion; zirconium tungstate; LINI0.5CO0.2MN0.3O2 CATHODE MATERIAL; NI-RICH LINI0.8CO0.1MN0.1O2; SINGLE-CRYSTAL MORPHOLOGY; HIGH-ENERGY; SURFACE MODIFICATION; RATE CAPABILITY; OXIDE CATHODE; LONG-LIFE; LITHIUM; STABILITY;
D O I：
10.1002/ente.202100183
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
More measures are being developed to enhance the electrochemical stability of single-crystal LiNi0.6Co0.2Mn0.2O2 (NCM622), but few focus on improving the stability of NCM622 through heat and deformation management. Herein, a negative-thermal-expansion (NTE) material of zirconium tungstate ZrW2O8 is adopted to modify NCM622 via a facile method, and the sample with a proper content of ZrW2O8 exhibits superior cycle performance and rate capability. The capacity retention ratio of modified NCM622 is 86.2% (from 193.6 to 166.8 mAh g(-1)) after 100 cycles at 2 C between 2.8 and 4.5 V at 60 degrees C, whereas that of the pristine NCM622 is only 77.5% (from 183.8 to 142.4 mAh g(-1)). According to various analysis results, the possible enhancing mechanisms of ZrW2O8 for NCM622 are discussed. It is an alternative for the remaining good structure of energy materials using NTE materials.
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页数：8
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