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

被引：21

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

来源：

JOURNAL OF MATERIALS CHEMISTRY A | 2020年 / 8卷 / 40期

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

页码：20979 / 20986

页数：8

共 34 条

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