Controlled synthesis of iron sulfide coated by carbon layer to improve lithium and sodium storage

• DOI: 10.1016/j.electacta.2017.07.106
• Publication Date: 2017-07-19T19:15:39Z
• Authors: Shengyang Li; Baihua Qu; Hui Huang; Pan Deng; Chaohe Xu; Qiuhong Li; Taihong Wang
• Keywords: 02 engineering and technology; 0210 nano-technology; 7. Clean energy

Abstract Design and constructing hierarchical architecture nanostructure is very effective to achieve good electrochemical performance for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). Herein, uniform hierarchical Fe 7 S 8 nanostructures coated by thin carbon layer (Fe 7 S 8 /C) have been prepared by a facile Polyvinylpyrrolidone (PVP) assisting hydrothermal method and heat treatment. PVP is acting dual function as both a surfactant for self-assembly of the secondary structure, and also providing porous carbon layers equably coating on Fe 7 S 8 nanostructures after annealing process. Benefiting from the well-designed structure, a high reversible capacity of 751 mAh g −1 over 100 cycles at 100 mA g −1 is delivered for LIBs, and it also manifests superior sodium ion storage properties with a capacity of 497 mAh g −1 after 100 cycles at 100 mA g −1 . The remarkable electrochemical performance of the Fe 7 S 8 /C composite implies the great potential as high capacity anode for next generation energy storage.