Enhanced electrochemical performance of La and F co-modified Ni-rich cathode

被引:14
作者
Wang, Ruo [1 ]
Zhang, Tesen [1 ]
Zhang, Qianru [1 ]
Zheng, Mingwen [1 ]
Xu, Kai [1 ]
Yan, Weitao [1 ]
机构
[1] Fuzhou Univ, Coll Chem, Fuzhou 350116, Fujian, Peoples R China
关键词
Ni-rich; Cathode; LiNi0; 8Co(0); 1Mn(0); 1O(2); Coating; Doping; LITHIUM-ION BATTERIES; 010 ACTIVE PLANES; LINI0.8CO0.1MN0.1O2; CATHODE; CYCLING PERFORMANCE; RATE CAPABILITY; LINI0.8CO0.15AL0.05O2; LINI1/3CO1/3MN1/3O2; KINETICS; VOLTAGE; SURFACE;
D O I
10.1007/s11581-019-03316-7
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
With the development of the times, the energy density of cathodes can no longer meet the requirement of the society, which has greatly limited the commercialization process of Ni-rich cathodes. Doping combined with coating is a perfect approach to improve the performance of Ni-rich cathodes. In this paper, La was used as a modified element to realize doping in the layered host structure as well as La2O3 coating on the surface. To further enhance the interface stability of LiNi0.8Co0.1Mn0.1O2, F was also employed to modify the surface, so as to change the coating layer from oxide (La2O3) to fluoride (LaF3), which further improved the surface stability. Additionally, a series of testing instruments, including XRD, EDS mapping, and HRTEM, were employed, which suggested that a small amount of La was introduced into the host structure as a pillar to the stable layered structure, and there was an uniform LaF3 coating layer covered on the Ni-rich cathodes. As a result, the electrochemical performance of the cathodes was greatly improved, with the capacity retention of 86.63% and 80.79% after 200 cycles at 1 C rate and 300 cycles at 8 C rate, respectively; besides, the kinetics of lithium diffusion was also improved.
引用
收藏
页码:1165 / 1171
页数:7
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