Alkaline earth metal vanadates as sodium-ion battery anodes

作者：Xiaoming Xu, Chaojiang Niu, Man-Yi Duan, Xuanpeng Wang, Lei Huang, Junhui Wang, Liting Pu, Wenhao Ren, Changwei Shi, Jiasheng Meng, Bo Song, Liqiang Mai · 发表于：Nature Communications · 年份：2017 · DOI：10.1038/s41467-017-00211-5 · 被引用次数：164 · 研究领域：Advancements in Battery Materials、Advanced Battery Materials and Technologies、Advanced battery technologies research

Abstract The abundance of sodium resources indicates the potential of sodium-ion batteries as emerging energy storage devices. However, the practical application of sodium-ion batteries is hindered by the limited electrochemical performance of electrode materials, especially at the anode side. Here, we identify alkaline earth metal vanadates as promising anodes for sodium-ion batteries. The prepared calcium vanadate nanowires possess intrinsically high electronic conductivity (> 100 S cm −1 ), small volume change (< 10%), and a self-preserving effect, which results in a superior cycling and rate performance and an applicable reversible capacity (> 300 mAh g −1 ), with an average voltage of ∼1.0 V. The specific sodium-storage mechanism, beyond the conventional intercalation or conversion reaction, is demonstrated through in situ and ex situ characterizations and theoretical calculations. This work explores alkaline earth metal vanadates for sodium-ion battery anodes and may open a direction for energy storage.