Preparation of Cation-Disordered Li3V2O5 Nanorod Cathode Materials and Improvement of Their Electrochemical Stability

被引：0

作者：

Wang C. ^{[1
]}

Cao S. ^{[1
]}

Li A. ^{[1
]}

Hu C. ^{[1
]}

Wang G. ^{[1
]}

Liu Z. ^{[2
]}

Chen K. ^{[2
]}

Wang C. ^{[1
]}

Chen Z. ^{[1
]}

机构：

[1] School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei

[2] CNSG Anhui Hongsifang CO., LTD., Hefei

来源：

Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2023年 / 51卷 / 07期

关键词：

cathode material; cation disordered; lithium vanadate; lithium-ion battery;

D O I：

10.14062/j.issn.0454-5648.20230145

中图分类号：

学科分类号：

摘要：

It is important for the further improvement of lithium-ion battery energy densities to develop high-specific-capacity cathode materials. Li3V2O5 has attracted much attention due to its high specific capacity, even exceeding 240 mA·h/g. However, its low electrochemical cycling stability induced by the low Li+ transport dynamics and irreversible phase transition restricts the application of Li3V2O5 cathode materials in lithium-ion batteries. In this paper, co-doped Li3V2O5 nanorod cathode materials were prepared. The one-dimensional structure can relieve the accumulation of strain during charging and discharging process. Also, Co3+ doping can stabilize the structure of Li3V2O5 by forming the more intense Co—O bonds. Furthermore, Co3+ doping expands the cell volume and ratio of V4+ in Li3V2O5. These collectively result in the improved Li+ diffusion coefficient and cycling stability of Li3V2O5. The 1% Co-doped Li3V2O5 (i.e., 1%Co–LVO sample) has a specific discharge capacity of 256.43 mA·h/g at a current density of 50 mA/g and a capacity retention rate of 77.3% after 100 cycles, which is 28% greater than that of the pristine Li3V2O5. 1%Co–LVO sample shows a superior capacity fading (i.e., 0.23%/cycle). This paper can provide an effective method for the preparation and performance regulation of high-energy-density lithium-ion cathode material (i.e., Li3V2O5). © 2023 Chinese Ceramic Society. All rights reserved.

引用

页码：1670 / 1679

页数：9

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