阳极
材料科学
碳化
化学工程
碳纤维
双功能
普鲁士蓝
复合数
纳米技术
电极
化学
复合材料
电化学
有机化学
催化作用
扫描电子显微镜
物理化学
工程类
作者
Yefeng Yang,Jiajia Hu,Gaoya Ren,Yi Wen,Qipu Lin,Zhujun Yao
标识
DOI:10.1002/zaac.202300158
摘要
Abstract Pyrite FeS 2 has emerged as promising anode material for sodium‐ion batteries (SIBs). Nevertheless, low electrical conductivity, large volume variation and shuttling effect generally lead to low specific capacity and inferior rate capability, greatly impeding its practical application. Here, heterostructured CoS 2 /FeS 2 particles anchored on ultrathin carbon nanosheets (denoted as CoS 2 /FeS 2 /C) have been fabricated using a simple and facile co‐precipitation combined with carbonization and gas sulfurization processes. The combination of bifunctional N‐doped carbon nanosheets and unique heterostructure can provide better electrical conductivity, enhanced ion diffusion kinetics and offer reinforced structural integrity. Benefitting from the compositional and structural advantages, the as‐prepared CoS 2 /FeS 2 /C hybrid composite exhibits boosted sodium storage properties, including outstanding rate capability (500.4 mA h g −1 at 5 A g −1 ) and cycling stability with a retention of 95.8 % after 700 cycles.
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