title: Carbon Coated SnS/SnO2Heterostructures Wrapping on CNFs as an Improved-Performance Anode for Li-Ion Batteries: Lithiation-Induced Structural Optimization upon Cycling.
abstract: Carbon coated SnS/SnO2heterostructures wrapping on carbon nanofibers (C@SnS/SnO2@CNFs) was demonstrated to have excellent performance as an anode material for Li-ion batteries. C@SnS/SnO2@CNFs electrode delivers high reversible capacity of 826.8 mA h g-1(500th cycle) at the current density of 1.0 A g-1. However, an interesting phenomenon of increasing capacity on cycling can be observed. According to the analysis of the evolution of structure and electrochemical property, C@SnS/SnO2@CNFs is demonstrated to experience the progress of conversion from nanowalls containing polycrystals into amorphous nanosheets with high porosity and larger surface upon cycling. The above lithiation-induced structural optimization provides larger effective surface areas and encourages the conversion reactions, which can promote charge transfer and also enhance the reversibility of the conversion reactions of SnS and SnO2inducing the increasing reversible capacity. The study explains the progress of increasing capacity of C@SnS/SnO2@CNFs and likewise provides a perspective on optimization of the electrochemical performance of electrodes.
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Qingwang
authors: Q
authors: Lian
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Gang
authors: G
authors: Zhou
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Xiaohui
authors: X
authors: Zeng
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Chen
authors: C
authors: Wu
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Yuehua
authors: Y
authors: Wei
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Chao
authors: C
authors: Cui
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Weifeng
authors: W
authors: Wei
authors: State Key Laboratory of Powder Metallurgy, Central South University , Changsha 410083, China.
authors: Libao
authors: L
authors: Chen
authors: School of Chemical Engineering and Light Industry, Guangdong University of Technology , Guangzhou 523000, China.
authors: Chengchao
authors: C
authors: Li
keywords: C@SnS/SnO2@CNFs; carbon coated; heterostructures; increasing capacity; lithium-induced structural optimization; lithium-ion battery