Uniform core–shell nanobiscuits of Fe7S8@C for lithium-ion and sodium-ion batteries with excellent performance. Issue 17 (19th April 2018)

• Record Type: Journal Article
• Authors: Shi, Ludi; Li, Dongzhi; Yu, Jiali; Liu, Huichao; Zhao, Yong; Xin, Hailin; Lin, Yemao; Lin, Chengdong; Li, Cuihua; Zhu, Caizhen
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 17(2018)
• Page Start: 7967
• Page End: 7976
• Publication Date: 2018-04-19
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c8ta00985f
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The as-prepared Fe7 S8 @C exhibits outstanding electrochemical performance as anode materials for LIBs and SIBs owing to the biscuit-like nanostructure and conformal surface coating with carbon. Abstract : Iron sulfides, as promising anode materials, have been intensively studied, but still encounter problems due to their limited cycle life caused by huge volume changes. In the present work, a facile method has been presented to prepare Fe2 O3 nanobiscuits followed by poly(dopamine) coating. After thermally induced sulfurization, Fe7 S8 @C nanobiscuits have been successfully obtained, which show high specific capacities, excellent rate capabilities and stable cycling stability as anodes for lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs). They exhibit high reversible capacities of 547.3 mA h g −1 after 600 cycles and 530.8 mA h g −1 after 1000 cycles at a high current density of 5 A g −1 for LIBs and SIBs, respectively. This outstanding electrochemical performance may be attributed to the stress-buffering effect owing to the biscuit-like nanostructure and conformal surface coating with carbon.