Abstract

The results of studying the structure and phase composition of thin-film positive electrodes of a lithium-ion battery based on vanadium oxides are presented. It is shown that initially polycrystalline films contain higher V₂O₅ and V₃O₇ oxides, the proportion of which increases with the time of oxygen annealing. As a result of charge–discharge cycling, the higher vanadium oxides are amorphized, while the content of the VO₂ and V₂O₃ phases decreases slightly, and the proportion of VO oxide remains unchanged. These data are in good agreement with the change in the capacity of the films during their cycling, which suggests that the main reason for the decrease in the capacity of the films is the amorphization of the higher vanadium oxides with the highest specific capacity.

中文翻译：

---

锂可逆插入过程中钒氧化物的非晶化

摘要

给出了研究基于钒氧化物的锂离子电池薄膜正极的结构和相组成的结果。结果表明，最初的多晶膜含有较高的V ₂ O ₅和V ₃ O ₇氧化物，其比例随着氧退火时间的增加而增加。充放电循环的结果是，高级钒氧化物被非晶化，而VO ₂和V ₂ O ₃的含量相稍微降低，并且VO氧化物的比例保持不变。这些数据与薄膜在其循环期间的容量变化非常吻合，这表明薄膜容量降低的主要原因是具有最高比容量的高级钒氧化物的非晶化。