Effects of a solid electrolyte coating on the discharge kinetics of a LiCoO2 electrode: mechanism and potential applications

被引:19
作者
Charles-Blin, Youn [1 ]
Nemoto, Kazune [1 ]
Zettsu, Nobuyuki [1 ,2 ]
Teshima, Katsuya [1 ,2 ]
机构
[1] Shinshu Univ, Dept Chem Mat, 4-17-1 Wakasato, Nagano 3808553, Japan
[2] Shinshu Univ, Res Inst Supramat, 4-17-1 Wakasato, Nagano 3808553, Japan
关键词
ENHANCED ELECTROCHEMICAL PERFORMANCE; LITHIUM-ION TRANSFER; CATHODE MATERIAL; RATE CAPABILITY; LI; INTERFACE; SURFACE;
D O I
10.1039/d0ta05656a
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
The application of a Li+-conductive amorphous Li2B4O7 coating on a LiCoO2 electrode enhanced its discharge kinetics by increasing the local concentration of Li+ at the surface of LiCoO2 particles. The origin of internal resistance in Li+ intercalation steps was elucidated by electrochemical impedance spectroscopy (EIS)-based characterization of discharge kinetics for states of charges of 0, 50, and 100%, while the activation energies of intercalation steps were determined from EIS data collected at different temperatures (-10, 0, 20, and 40 degrees C). The activation energy of Li+ desolvation was smaller than that previously reported for bare LiCoO2 particles, which suggested that the significant changes in kinetics associated with polarization mitigation were due to the Li+ exchange reaction (Li+ adsorption and diffusion processes) on the surface of LiCoO2 particles. Finally, C-rate capability tests performed at -10 degrees C revealed that the capacity retention of the electrode comprising Li2B4O7-coated LiCoO2 particles exceeded that of the electrode comprising bare LiCoO2 particles (45% vs. 18%, respectively).
引用
收藏
页码:20979 / 20986
页数:8
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