钒氧基电极材料特点及其改性方法

Characterization and Modification Method of Oxovanadium-Based Electrode Materials

钒氧基化合物作为钒基化合物中重要的一员,其具有比容量高、价格低廉等特点,是一种极具有前景的电极材料,然而其电导率低、可溶解于电解液,造成充放电过程中倍率、循环稳定性差。本文介绍了钒氧基化合物作为锂离子/钠离子电池电极材料的研究进展,重点介绍了钒氧基化合物电化学性能降低的原因。综述了针对钒氧基化合物问题所采用的离子掺杂、表面包覆、导电物质复合解决办法,并讨论了一些具有代表性的改性后电极材料的制备方法、电化学性能及相应机制,且展望了钒氧基化合物未来的研究方向。

Among various vanadium-based materials, oxovanadium-based materials are promising candidates for lithium-ion battery electrodes because of their high capacity and low price. However, due to their fairly low conductivity and dissolution in electrolyte, the practical usage of oxovanadium-based materials shows poor rate capability and cycling stability. In this review, the recent progress in oxovanadium-based materials for lithium/ sodium ion batteries is introduced and focused on their storage and capacity fading mechanisms. To overcome the low conductivity and irreversible phase transition, metal-doped, surface coating and conductive material composite are reviewed. Synthesis method, electrochemical performance and possible mechanism of typical modified electrode materials are discussed and the prospects of oxovanadium-based materials are also discussed.