材料科学
阳极
法拉第效率
介孔材料
纳米结构
硅
纳米技术
锂离子电池
石墨烯
碳纤维
锂(药物)
光电子学
复合数
电化学
电极
电池(电)
复合材料
功率(物理)
生物化学
化学
量子力学
催化作用
物理化学
内分泌学
医学
物理
作者
Chenhui Fang,Jiaxing Liu,Xiaofeng Zhang,Wen Luo,Guoqing Zhang,Xinxi Li,Zhongyun Liu,Pengfei Yin,Wei Feng
标识
DOI:10.1021/acsami.1c07898
摘要
The low-cost and high-capacity micron silicon is identified as the suitable anode material for high-performance lithium-ion batteries (LIBs). However, the particle fracture and severe capacity fading during electrochemical cycling greatly impede the practical application of LIBs. Herein, we first proposed an in situ reduction and template assembly strategy to attain a weave cage-like carbon nanostructure, composed of short carbon nanotubes and small graphene flakes, as a flexible nanotemplate that closely wrapped micron-sized mesoporous silicon (PSi) to form a robust composite construction. The in situ formed weave cage-like carbon nanostructure can remarkably improve the electrochemical property and structural stability of micron-sized PSi during deep galvanostatic cycling and high electric current density owing to multiple attractive advantages. As a result, the rechargeable LIB applying this anode material exhibits improved initial Coulombic efficiency (ICE), excellent rate performance, and cyclic stability in the existing micron-sized PSi/nanocarbon system. Moreover, this anode reached an approximation of 100% ICE after only three cycles and maintains this level in subsequent cycles. This design of flexible nanotemplated platform wrapped micron-sized PSi anode provides a steerable nanoengineering strategy toward conquering the challenge of long-term reliable LIB application.
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