Effects of Various Elements Doping on LiNi0.6Co0.2Mn0.2O2 Layered Materials for Lithium-Ion Batteries

被引：15
作者：
Lu, Yang [1 ,2 ]
Mo, Yan [1 ,2 ]
Chen, Yong [1 ,2 ,3 ]
Yu, Feng [2 ]
机构：
[1] Foshan Univ, Guangdong Key Lab Hydrogen Energy Technol, Sch Mat Sci & Hydrogen Energy, Foshan 528000, Peoples R China
[2] Hainan Univ, State Key Lab Marine Resource Utilizat South Chin, Hainan Prov Key Lab Res Utilizat Si Zr Ti Resourc, Haikou 570228, Hainan, Peoples R China
[3] Nankai Univ, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
来源：
ENERGY TECHNOLOGY | 2021年 / 9卷 / 07期
基金：
中国国家自然科学基金;
关键词：
cathode materials; cycle performance; doping; Li-ion batteries; structural stability; CATHODE MATERIAL; ELECTROCHEMICAL PROPERTIES; DOPED LINI0.5CO0.2MN0.3O2; STRUCTURAL-CHANGES; LI; FE; CU; PERFORMANCE; CHALLENGES; AL;
D O I：
10.1002/ente.202100074
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：
Ni-rich LiNi0.6Co0.2Mn0.2O2 (NCM622) and doped LiNi0.6-x Co0.2Mn0.2M x (M = Cr, Cu, Fe, Sn, and Zn) are synthesized and investigated for lithium-ion batteries. The doping effects on morphology, crystal structure, and electrochemical performance are evaluated. These results suggest that introducing elements of Cu, Sn, and Zn is favorable for the structural integrity because the cation mixing of Li+/Ni2+ is reduced. Extended cycle life is obtained for these Cu- and Sn-doped electrodes. When operated at the cutoff voltage of 4.4 V, about 86% and 99% of the initial capacity can be maintained within 200 cycles for LiNi0.59Co0.2Mn0.2Cu0.01O2 and LiNi0.59Co0.2Mn0.2Sn0.01O2, respectively. Possible factors for capacity decay involving structural properties, polarization degree, and impedance increment are discussed. Meanwhile, Cu looks promising as a novel dopant for layered NCM622 cathode materials with improved structures and properties, in which the optimized doping amount is also discussed in detail.
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页数：7
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