Статья

Ultrathin Si Nanosheets Dispersed in Graphene Matrix Enable Stable Interface and High Rate Capability of Anode for Lithium‐ion Batteries

Yang RenMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaLizhi XiangMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaXucai YinMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaRang XiaoMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaPengjian ZuoMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaYunzhi GaoMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaGeping YinMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. ChinaChunyu DuMIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage and Institute of Advanced Chemical Power Sources School of Chemistry and Chemical Engineering Harbin Institute of Technology Harbin 150001 P. R. China

2022en

ABI

Аннотация

Abstract Owing to the thinness and large lateral size, 2D Si materials exhibit very promising prospects as the high‐performance anodes of lithium‐ion batteries (LIBs). However, the facile synthesis of ultrathin 2D Si nanosheets (Si‐NSs) and their efficient application still remain a great challenge. Herein, the fabrication of ultrathin Si‐NSs with the average thickness of < 2 nm is demonstrated using a unique etching‐reduction protocol. After hybridizing with graphene, the as‐prepared Si‐NSs@rGO material delivers ultrahigh rate capability (2395.8 mAh g −1 at 0.05 A g −1 and 1727.3 mAh g −1 at 10 A g −1 ), long cycling lifespan (1000 cycles at 2 A g −1 with a capacity decay rate of 0.05% per cycle) and high average Coulombic efficiency (99.85% during 1000 cycles). The superior performance is attributed to the ultrathinness of Si‐NSs that greatly improves the diffusivity and reversibility of Li + ions. This work provides a strategy for fabricating a high‐rate‐capability anode material to meet the growing demand for high power density LIBs.

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Идентификаторы

DOI: 10.1002/adfm.202110046

Цитирования и источники

Цитирований: 2Использованных источников: 0

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