Energy Storage Science and Technology ›› 2020, Vol. 9 ›› Issue (2): 353-360.doi: 10.19799/j.cnki.2095-4239.2019.0222

Previous Articles     Next Articles

Electrochemical performance of β-Li0.3V2O5 as a lithium-ion battery cathode material

ZOU Jian, WANG Bojun, YANG Jiachao, NIU Xiaobin, WANG Liping()   

  1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China
  • Received:2019-10-07 Revised:2019-11-01 Online:2020-03-05 Published:2019-11-11
  • Contact: Liping WANG E-mail:lipingwang@uestc.edu.cn

Abstract:

With the development of lithium (Li) and all-solid-state batteries, high energy-density Li-free/deficient cathode materials have received considerable attention. In this study, well-crystallized micron-size Li-deficient cathode material β-Li0.3V2O5 is synthesized via a one-step high-temperature solid-state reaction with an electronic conductivity of 2.20 × 10-4 S/cm. This material exhibits good cycling performance. It delivers a specific capacity of 247 mA·h/g when charging/discharging at 0.5 C between 2.2 V and 4.0 V, with a residual specific capacity of 204 mA·h/g after 100 cycles. In addition, β-Li0.3V2O5 shows excellent rate capabilities, i.e., 160 mA·h/g at 10C. Ex situ X-ray diffraction is applied to study phase transformations during the Li insertion/extraction process; five different phases exist in the voltage range of 1.5—4.0 V: β(0<x<0.27) → β′(0.57<x<0.75) → β1(0.57<x<1.92) → β2(0.75<x<1.92) → β3(1.92<x<2.52). The volume undergoes a small change during the cycling

process

a increases by a maximum of 3.1% (β2) and c increases by a maximum of 4.5% (β3).

Key words: high energy density, lithium ion batteries, Li deficient cathodes, vanadium oxide bronzes, phase transformations

CLC Number: