Journal
ENERGY
Volume 219, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2020.119513
Keywords
Multi-electron reaction; V2O5-Li3PO4 glass; CaC2; Li-ion battery; Cathode
Categories
Funding
- National Natural Science Foundation of China [51562008]
- Key Scientific & Technological Project of Hainan Province [ZDKJ2017011]
- Research Lab construction of Hainan University [ZY2019HN09]
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The vanadium-based amorphous electrode material can increase its specific capacity through multi-electron reaction and valence state conversion. Research shows that nanocrystallinity and controllable multi-electron reaction are crucial for designing new electrode materials with high capacity and long cycle life.
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 V2O5-Li3PO4 glass with a strong reducing agent CaC2, 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 CaC2 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 LiV2O5'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. (C) 2020 Elsevier Ltd. All rights reserved.
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