Boosting the Rate Performance and Capacity of Sb<sub>2</sub>S<sub>3</sub> Nanorods Cathode by Carbon Coating in All‐Solid‐State Lithium Batteries
Hongjun Ye, Zaifa Wang, Jitong Yan, Zhenyu Wang, Jingzhao Chen, Qiushi Dai, Yong Su, Baiyu Guo, Hui Li, Lin Geng, Congcong Du, Jing Wang, Yongfu Tang, Liqiang Zhang, Lingyun Zhu, Jianyu Huang
Abstract
Abstract Antimony sulfide (Sb 2 S 3 ) is a promising electrode material. However, its poor electronic/ionic conductivity severely hinders its practical application. Herein, carbon‐coated Sb 2 S 3 nanorods (Sb 2 S 3 @C) are synthesized to address this issue. The electrochemical performance of the Sb 2 S 3 @C is evaluated in all‐solid‐state lithium batteries (ASSLBs) using InLi anode and Li 10 Si 0.3 PS 6.7 Cl 1.8 solid‐state electrolytes. The Sb 2 S 3 @C cathode delivers the 1st cycle discharge capacity of 711 mAh g ‐1 and a stable cycling capacity of 431 mAh g ‐1 , which are much higher than the 1st cycle discharge capacity of 125 mAh g ‐1 and a stable cycling capacity of 320 mAh g ‐1 for the uncoated Sb 2 S 3 cathode. In situ transmission electron microscopy reveals that the carbon coating layer acts as an electronic/ionic conductive conduit, which boosts the charge transfer in the electrode dramatically. Consequently, the Sb 2 S 3 @C electrochemistry quickly evolves from intercalation to conversion to full alloying. However, the Sb 2 S 3 nanorods without carbon coating undergo sluggish intercalation and conversion reactions, and the alloying reaction is almost impeded, severely limiting the capacity. Therefore, the Sb 2 S 3 @C electrode is fully utilized thus delivering much higher capacity and rate performance than the non‐coated Sb 2 S 3 electrode. These results demonstrate that Sb 2 S 3 @C is a promising high‐energy‐density cathode for ASSLBs.