3D carbon-coated stannous sulfide-molybdenum disulfide anodes for advanced lithium-ion batteries. Issue 7 (16th September 2020)

• Record Type: Journal Article
• Authors: Luo, Yuanyi; Chen, Chunxia; Sun, Weicheng; Shi, Ludi; Lin, Yemao; Cong, Guangtao; Yu, Jiali; Zhu, Caizhen; Xu, Jian
• Is Part Of: Materials advances. Volume 1:Issue 7(2020)
• Page Start: 2323
• Page End: 2331
• Publication Date: 2020-09-16
• Subjects: 620.11
• DOI: 10.1039/d0ma00493f
• Languages: English
• ISSNs: 2633-5409

Abstract

Abstract : A strategy has been developed to fabricate 3D SnS–MoS2 @C, which significantly improves the electrochemical performance of metal sulfide anodes. Abstract : Metal sulfides have been extensively studied as alternative anodes for lithium-ion batteries (LIBs) due to their high specific capacity, which comes from their combined conversion and alloying/de-alloying reactions with lithium, forming Li2 S and corresponding lithium alloys, respectively. However, the large volume fluctuation during cycling, low electronic/ionic conductivities of both metal sulfides and Li2 S, and the electrochemical inactivity of Li2 S lead to poor reversibility and stability. Here, we report a facile way to synthesize a three-dimensional carbon-coated stannous sulfide-molybdenum disulfide composite (3D SnS–MoS2 @C) which is proposed to alleviate the aforementioned problems. 3D SnS–MoS2 @C exhibits a highly porous structure, which enhances the contact between the electrode and the electrolyte, promotes the transport of both electrons and Li +, and buffers the volume change during cycling. MoS2 contributes to the specific capacity and catalyzes the oxidation of Li2 S. The 3D SnS–MoS2 @C anode demonstrates a capacity of 887.1 mA h g −1 for the first cycle at 200 mA g −1 and achieves a capacity retention of 97.1% over 200 cycles. In addition, the ternary composite exhibits a superior rate performance and cycling lifespan, achieving a gravimetric capacity of 651.2 mA h g −1 at 1000 mA g −1 after 500 cycles. The proposed facile and effective strategy could be universally applied to other metal sulfide-based electrodes.