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In Situ-Formed Hollow Cobalt Sulfide Wrapped by Reduced Graphene Oxide as an Anode for High-Performance Lithium-Ion Batteries

Lu, Shi-jie, Wang, Zhi-teng, Zhang, Xia-hui, He, Zhen-jiang, Tong, Hui, Li, Yun-jiao, Zheng, Jun-chao
ACS applied materials & interfaces 2020 v.12 no.2 pp. 2671-2678
anodes, cobalt sulfide, electrochemistry, graphene, graphene oxide, grinding, lithium batteries
Transition-metal sulfides have been considered as promising anode materials for lithium-ion batteries (LIBs) due to their high theoretical specific capacity and superior electrochemical performance. However, the large volume change during the discharge/charge process causes structural pulverization, resulting in rapid capacity decline and the loss of active materials. Herein, we report Co₁–ₓS hollow spheres formed by in situ growth on reduced graphene oxide layers. When evaluated as an anode material for LIBs, it delivers a specific capacity of 969.8 mAh·g–¹ with a high Coulombic efficiency of 96.49% after 90 cycles. Furthermore, a high reversible capacity of 527.2 mAh·g–¹ after the 107th cycle at a current density of 2.5 A g–¹ is still achieved. The results illustrate that in situ growth on the graphene layers can enhance conductivity and restrain volume expansion of cobalt sulfide compared with ex situ growth.