Co2+/Co0 enhances the capacity of lithium-ion batteries in vanadium-based glass anode. (March 2022)

• Record Type: Journal Article
• Authors: Liang, Xue; Kong, Fanhou; Wang, Dan; Yi, Lanlin; Zhang, Ruixiang; Rao, Yinzhao; Jiang, Hong; Chen, Zelin; Yu, Xiaolong; Chen, Yongjun; Li, Changjiu
• Is Part Of: Materials today communications. Volume 30(2022)
• Publication Date: 2022-03
• Subjects: Multi-electron reaction -- V2O5-TeO2-CoO glass -- Anode -- Lithium-ion battery; Materials science -- Periodicals; 620.11
• DOI: 10.1016/j.mtcomm.2021.103047
• Languages: English
• ISSNs: 2352-4928

Abstract

Abstract: Amorphous vanadates are of increasing interest for use as electrode materials in lithium ion batteries. A series of (100-x)(40 V2 O5 -60TeO2 )-xCoO (x = 0, 5, 10, 15, 20, 25) glasses were obtained by traditional melt quenching method. The initial discharge capacity of the 40 V2 O5 -60TeO2 glass was 416.0 mAh g −1, while the initial discharge capacity of the 34 V2 O5 -51TeO2 -15CoO (x = 15) glass reached 726.4 mAh g −1 . Among all glass samples, 34V2O5–51TeO2–15CoO glass had the highest V 4+ content (52.26%) and showed the best electrical conductivity. The addition of CoO increases the content of V 4+, realizing a multi-electron reaction of Co 2+ /Co 0, which enhances the electronic conductivity and capacity. It also increases the content of NBO as well as the number of VO5 units decreases with a corresponding increase in the number of VO4 units, leading to an inferior connection between structural units of glasses and loosening the glass structure. Consequently, the space for Li + transmission increases, thereby providing more sites for Li + insertion-extraction. This work provides a novel multi-electron reaction ternary glass anode material for the preparation of lithium-ion battery. Highlights: The addition of CoO increases the content of V 4+ and improves the transport of electrons. On the basis of V 5+ /V 4+ /V 3+ electron reaction, the addition of CoO provides Co 2+ /Co 0, a multi-electron reaction, which enhances the electronic conductivity and capacity. Compared with V2 O5 -TeO2, the increase of VO4 units and NBO ions leads to a looser structure of V2 O5 -TeO2 -CoO, improves ions diffusion coefficient and provides more channels and sites for Li + transport and insertion-extraction.