A Bi 2 S 3 @CNT nanocomposite as anode material for sodium ion batteries

Bismuth sulfide (Bi2S3) has been considered a potential electrode material for Li storage due to its high theoretical capacity and intriguing reaction mechanism. In this work we have designed a Bi2S3@CNT nanocomposite as a sodium ion (Na-ion) battery anode material, and studied its electrochemical performance. The layer structured Bi2S3 provides host sites for insertion of Na-ion and the carbon nanotube (CNT) in the Bi2S3@CNT nanocomposite serves as a highly conducting network to promote electron transport. The results show that the Bi2S3@CNT nanocomposite exhibits a high and stable capacity in the 0.01–3V (vs. Na/Na+) voltage region, notably outperforming the bare Bi2S3 material. The Bi2S3@CNT nanocomposite as Na-ion anode material is able to discharge 84.4mAhg−1 capacity at 60mAg−1 over 60 full cycles.