1. Multi-electron reactions for the synthesis of a vanadium-based amorphous material as lithium-ion battery cathode with high specific capacity.
- Author
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Kong, Fanhou, Liang, Xue, Yi, Lanlin, Fang, Xiaohui, Yin, Zhongbin, Wang, Yulong, Zhang, Ruixiang, Liu, Longyang, Chen, Qing, Li, Minghan, Li, Changjiu, Jiang, Hong, and Chen, Yongjun
- Subjects
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AMORPHOUS substances , *LITHIUM-ion batteries , *VANADIUM oxide , *LIMIT cycles , *REDUCING agents - Abstract
The vanadium-based amorphous electrode material can realize the valence state conversion and increase its specific capacity through the multi-electron reaction. We have obtained V 2 O 5 –Li 3 PO 4 glass with a strong reducing agent CaC 2 , realizing a multi-electron reaction of V5+ to V4+ and then to V3+ in the model system. Moreover, we have explored the relationship between valence state, crystallinity, and conductivity limit to compare the cycle performances of amorphous glass batteries. The CaC 2 content of 20%, V4+ presented the dominating valence state with a content of 77.5%. VP-C20% exhibited a maximum specific capacity of 319.3 mAh g−1, and the specific capacity after 100 cycles was 280.3 mAh g−1, corresponding to a retention capacity of 87.8%. The electrochemical performance of amorphous vanadium oxide decreased with the increase of the LiV 2 O 5 's nanocrystallinity. Crystallinity and the controllable multi-electron reaction could provide an important reference for designing other new electrode materials with high capacity and long cycle life. Image 1 • Vanadium-based amorphous electrode material could realize valence state conversion. • V5+ was reduced to V4+, then to V3+ with CaC 2 , as reducing agent. • V4+ enhanced ion and electron transport and cycling stability. • The performance decreased with the increase of LiV 2 O 5 's nanocrystallinity. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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