High-Performance Cathode Based on Microporous Mo-V-Bi Oxide for Li Battery and Investigation by Operando X-ray Absorption Fine Structure

Zhenxin Zhang; Satoshi Ishikawa; Masaki Kikuchi; Hirofumi Yoshikawa; Qi Lian; Heng Wang; Toshiaki Ina; Akihiro Yoshida; Masahiro Sadakane; Futoshi Matsumoto; Wataru Ueda

doi:10.1021/acsami.7b07195

High-Performance Cathode Based on Microporous Mo-V-Bi Oxide for Li Battery and Investigation by Operando X-ray Absorption Fine Structure

ACS Appl Mater Interfaces. 2017 Aug 9;9(31):26052-26059. doi: 10.1021/acsami.7b07195. Epub 2017 Jul 31.

Authors

Affiliations

¹ Faculty of Engineering, Kanagawa University , Rokkakubashi, Kanagawa-ku, Yokohama-shi, Kanagawa 221-8686, Japan.
² Materials and Structures Laboratory, Tokyo Institute of Technology , Nagatsuta-cho 4259, Midori-ku, Yokohama-city, Kanagawa 226-8503, Japan.
³ School of Science and Technology, Kwansei Gakuin University , 2-1 Gakuen, Sanda, Hyogo 669-1337, Japan.
⁴ School of Material and Chemical Engineering, Zhengzhou University of Light Industry , Zhengzhou 450002, China.
⁵ Japan Synchrotron Radiation Research Institute , Sayo-gun, Hyogo 679-5198, Japan.
⁶ Department of Applied Chemistry, Graduate School of Engineering, Hiroshima University , 1-4-1 Kagamiyama, Higashi Hiroshima 739-8527, Japan.

PMID: 28718620
DOI: 10.1021/acsami.7b07195

Abstract

The development of cathode-active material of Li battery is important for the current emerging energy transferring and saving problems. A stable crystalline microporous complex metal oxide based on Mo, V, and Bi is an active and suitable material for Li battery. High capacity (380 Ah/kg) and stable cycle performance are achieved. X-ray absorption near-edge structure analyses demonstrate that the original Mo⁶⁺ and V⁴⁺ ions are reduced to Mo⁴⁺ and V³⁺ in the discharging process, respectively, which results in a 70-electron reduction per formula. The reduced metal ions can be reoxidized reversibly in the next charging process. Furthermore, extended X-ray absorption fine structure analyses reveal that the Mo-O bonds in the material are lengthened in the discharging process probably due to interaction with Li⁺ without change of the basic structure.

Keywords: Li battery; electrochemical property; operando XAFS; redox property; transition metal oxide.