Unraveling the LiNbO3 coating layer on battery performances of lithium argyrodite-based all-solid-state batteries under different cut-off voltages

Wei，Chaochao1,2; Yu，Chuang1; Chen，Shaoqing3; Chen，Shuai1; Peng，Linfeng1; Wu，Yuanke1; Li，Shuping4; Cheng，Shijie1; Xie，Jia1

2023-01-10

10.1016/j.electacta.2022.141545

ELECTROCHIMICA ACTA   Impact Factor & Quartile

0013-4686

1873-3859

The coating layer can effectively mitigate the undesirable side effects that occur at the active material/sulfide electrolyte interface in the cathode mixture. Plenty of research has reported the coating layer effect in the typical voltage window, while the influence at different voltage windows is unclear. Herein, the degradation mechanism of the bare and LiNbO coated LiCoO electrodes in all-solid-state batteries when cycled at different cut-off voltages has been systematically investigated. Thecoated electrodes exhibit superior electrochemical performance than the bare electrodes at different charging/discharging rates when the upper cut-off voltage is 3.6 V, while both electrodes show fast degradation of battery performance at higher cut-off voltages (3.9 and 4.2 V). The electrochemical performances are highly dependent on the interfacial stability between the active material and solid electrolyte in the cathode mixture and the structural instability of LiCoO at different voltage windows. The evolution of interfacial resistances is systematically investigated in combination of in-situ EIS, relaxation time distribution (DRT), TEM, and XPS. Structural changes of bare and coated LiCoO before and after cycled at different cut-off voltages are studied by XRD, TEM, and dQ/dV analysis. The clarification of complex interfaces and phase stability evolution of LiCoO provides a strong theoretical basis for constructing high-performance all-solid-state batteries.

All-solid-state batteries Chlorine-rich argyrodite LiCoO2 cathode LiNbO3 coating Voltage windows

SCI

English

Others

National Key Research and Development Program of China[2021YFB2400200];National Key Research and Development Program of China[2021YFB2500300];National Natural Science Foundation of China[52177214];

Electrochemistry

Electrochemistry

WOS:000929834000003

PERGAMON-ELSEVIER SCIENCE LTD

CHEMISTRY

2-s2.0-85142182825

Scopus

1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology,School of Electrical and Electronic Engineering,Huazhong University of Science and Technology,Wuhan,430074,China
2.School of Chemistry and Chemical Engineering,Huazhong University of Science and Technology,Wuhan,430074,China
3.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.CATARC Automotive Inspection Center (Wuhan) Co.,Ltd.,National New Energy Vehicle Quality Inspection Center,Wuhan,430056,China

Wei，Chaochao,Yu，Chuang,Chen，Shaoqing,et al. Unraveling the LiNbO3 coating layer on battery performances of lithium argyrodite-based all-solid-state batteries under different cut-off voltages[J]. ELECTROCHIMICA ACTA,2023,438.

Wei，Chaochao.,Yu，Chuang.,Chen，Shaoqing.,Chen，Shuai.,Peng，Linfeng.,...&Xie，Jia.(2023).Unraveling the LiNbO3 coating layer on battery performances of lithium argyrodite-based all-solid-state batteries under different cut-off voltages.ELECTROCHIMICA ACTA,438.

Wei，Chaochao,et al."Unraveling the LiNbO3 coating layer on battery performances of lithium argyrodite-based all-solid-state batteries under different cut-off voltages".ELECTROCHIMICA ACTA 438(2023).