SnS@C nanoparticles anchored on graphene oxide as high-performance anode materials for lithium-ion batteries
Jing Mei, Jinlu Han, Fujun Wu, Qichang Pan, Fenghua Zheng, Juantao Jiang, Youguo Huang, Hongqiang Wang, Kui Liu, Qingyu Li
Abstract
Tin (II) sulfide (SnS) has been regarded as an attractive anode material for lithium-ion batteries (LIBs) owing to its high theoretical capacity. However, sulfide undergoes significant volume change during lithiation/delithiation, leading to rapid capacity degradation, which severely hinders its further practical application in lithium-ion batteries. Here, we report a simple and effective method for the synthesis of SnS@C/G composites, where SnS@C nanoparticles are strongly coupled onto the graphene oxide nanosheets through dopamine-derived carbon species. In such a designed architecture, the SnS@C/G composites show various advantages including buffering the volume expansion of Sn, suppressing the coarsening of Sn, and dissolving Li 2 S during the cyclic lithiation/delithiation process by graphene oxide and N-doped carbon. As a result, the SnS@C/G composite exhibits outstanding rate performance as an anode material for lithium-ion batteries with a capacity of up to 434 mAh g −1 at a current density of 5.0 A g −1 and excellent cycle stability with a capacity retention of 839 mAh g −1 at 1.0 A g −1 after 450 cycles.