Lithium ion storage behaviors of (100-x) V2O5-(x) P2O5 glass as novel anode materials for lithium ion battery
By Yu, Lü-qiang; Zhao, Shi-Xi; Wu, Xia; Li, Jing-Wei; Zhao, En-Lai; Wei, Guo-Dan
Published in Journal of Alloys and Compounds
2019
Abstract
A series of vanadium-phosphorus glass materials is prepared by a facile melt-quenching method and studied as anode materials for lithium ion battery. We systematically investigate lithium ion storage behaviors of these materials in surface capacitive and dynamics processes. The results show that the electrochemical performance of amorphous materials is much better than that of crystalline materials. Ex situ X-ray diffraction patterns show that the amorphous structure is maintained during the electrochemical process, which is beneficial for a stable long-term performance. 80V2O5–20P2O5 shows a reversible capacity of 377 mA h·g−1 after 600 cycles at 1 A·g−1. Moreover, the conductivity of these glass materials increases and the kinetics of lithium diffusion in glass materials shows limitations as the content of vanadium increases. The results indicate that further work to improve the conductivity and the diffusion of lithium ions could enhance the electrochemical performance of amorphous vanadium-phosphorus anode materials.