石墨烯
材料科学
氧化物
阳极
碳纳米纤维
化学工程
纳米纤维
纳米颗粒
静电纺丝
电解质
复合数
环氧树脂
电化学
纳米技术
复合材料
碳纳米管
电极
化学
物理化学
冶金
工程类
聚合物
作者
Jungwoo Shin,Kyusung Park,Won‐Hee Ryu,Ji Won Jung,Il Doo Kim
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2014-08-21
卷期号:6 (21): 12718-12726
被引量:45
摘要
Carbon nanofibers encapsulating Si nanoparticles (CNFs/SiNPs) were prepared via an electrospinning method and chemically functionalized with 3-aminopropyltriethoxysilane (APS) to be grafted onto graphene oxide (GO). As a result, the thin and flexible GO, which exhibits a negative charge in aqueous solution, fully wrapped around the APS-functionalized CNFs with a positive surface charge via electrostatic self-assembly. After the formation of chemical bonds between the epoxy groups on GO and the amine groups in APS via an epoxy ring opening reaction, the GO was chemically reduced to a reduced graphene oxide (rGO). Electrochemical and morphological characterizations showed that capacity loss by structural degradation and electrolyte decomposition on Si surface were significantly suppressed in the rGO-wrapped CNFs/SiNPs (CNFs/SiNPs@rGO). Superior capacities were consequently maintained for up to 200 cycles at a high current density (1048 mA h g−1 at 890 mA g−1) compared to CNFs/SiNPs without the rGO wrapping (304 mA h g−1 at 890 mA g−1). Moreover, the resistance of the SEI layer and charge transfer resistance were also considerably reduced by 24% and 88%, respectively. The described graphene wrapping offers a versatile way to enhance the mechanical integrity and electrochemical stability of Si composite anode materials.
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