ISSN 1608-4039 (Print)
ISSN 1680-9505 (Online)

For citation:

Rybakov K. S., Ushakov A. V. Application of operando X-ray diffraction to evaluate phase transformations of a LiCoVO₄ cathode. Electrochemical Energetics, 2022, vol. 22, iss. 4, pp. 161-169. DOI: 10.18500/1608-4039-2022-22-4-161-169, EDN: VVLBGN

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
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Language: 
Russian
Heading: 
Lithium electrochemical systems
Article type: 
Article
UDC: 
544.64
DOI: 
10.18500/1608-4039-2022-22-4-161-169
EDN: 
VVLBGN

Application of operando X-ray diffraction to evaluate phase transformations of a LiCoVO₄ cathode

Autors: 
Rybakov Kirill Sergeevich, Saratov State University
Ushakov Arseni Vladimirovich, Saratov State University
Abstract: 

Characterization by in situ or operando methods is very important to deeper understand the chemical and electrochemical processes, as well as the degradation processes that occur during the operation of a lithium-ion battery.

A variant of the operando electrochemical cell for the simultaneous study of the structural and electrochemical behavior of electrode materials was proposed. In designing the cell, special attention was paid to the simplicity of assembly, as well as to the use of the materials that provide high chemical and electrochemical stability when cycling in the potential range from 0 to 5 V vs. Li+/Li.

The paper presents the first results of the X-ray diffraction studies of the operando material of cobalt (II)-lithium vanadate (V) (LiCoVO4) with the inverted spinel structure. The new results concerning the structural behavior of LiCoVO4 showed a single-phase mechanism of lithium de/intercalation with a reversible change of the unit cell volume in the first cycle of about 3.7%. The reversibility of the volume change decreases in the second cycle along with the decrease of the cycling capacity, which is explained by rearrangement in the cationic sublattices of the inverted spinel.

Key words: 
lithium-ion battery
cathode material
cobalt(II)-lithium vanadate(V)
LiCoVO₄
x-ray diffraction
operando
Acknowledgments: 
The authors of the article express their gratitude to the General Director of OJSC “SRTI-Tesar” Afanasiy Khon and design engineer of LLC “Tesar-EKOGAL” Andrei O. Semenov for assistance in the fabrication of the electrochemical cell.
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Received: 
08.11.2022
Accepted: 
12.12.2022
Published: 
23.12.2022