Title: The structure transformation and electrochemical mechanism of cathode material Li_0.86V_0.8O₂

Authors: Fang Hu; Fenghui Gong; Fang Wang; Yinling Jin; Xiang Wu

Addresses: School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China ' School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China ' School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China ' School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China ' School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

Abstract: Li_0.86V_0.8O₂ cathode materials were prepared by a simple hydrothermal route. The results showed the as-obtained product had a layered hexagonal structure with the Li/V site disorder. The electrochemical tests in the rechargeable lithium batteries presented a capacity fading during the cycling. The crystal structure and local structure of the material during the cycles were also studied by X-ray diffraction and infrared spectrum, which demonstrated the capacity fading during the electrochemical cycling could be attributed to small irreversible structure change in the first charging process, and the loss of the first discharge can be assigned to the short-range disorder of V ions in the oxygen layers.

Keywords: lithium-ion batteries; Li0.86V0.8O2; cathode materials; electrochemical performance; hydrothermal method; capacity fading; short-range disorder; structure transformation; vanadium oxide; LiVO2; rechargeable batteries.

DOI: 10.1504/IJNM.2016.079216

International Journal of Nanomanufacturing, 2016 Vol.12 No.3/4, pp.278 - 285

Received: 08 May 2015
Accepted: 07 Dec 2015
Published online: 23 Sep 2016 *

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