Li Bing, Yao Fei, Bae Jung Jun, Chang Jian, Zamfir Mihai Robert, Le Duc Toan, Pham Duy Tho, Yue Hongyan, Lee Young Hee
1] Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Sungkyunkwan University, Suwon 440-746, Korea [2] Department of Energy Science, Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.
Department of Energy Science, Department of Physics, Sungkyunkwan University, Suwon 440-746, Korea.
Sci Rep. 2015 Jan 7;5:7659. doi: 10.1038/srep07659.
Hollow carbon nanospheres/silicon/alumina (CNS/Si/Al₂O₃) core-shell films obtained by the deposition of Si and Al₂O₃ on hollow CNS interconnected films are used as the anode materials for lithium-ion batteries. The hollow CNS film acts as a three dimensional conductive substrate and provides void space for silicon volume expansion during electrochemical cycling. The Al2O3 thin layer is beneficial to the reduction of solid-electrolyte interphase (SEI) formation. Moreover, as-designed structure holds the robust surface-to-surface contact between Si and CNSs, which facilitates the fast electron transport. As a consequence, the electrode exhibits high specific capacity and remarkable capacity retention simultaneously: 1560 mA h g(-1) after 100 cycles at a current density of 1 A g(-1) with the capacity retention of 85% and an average decay rate of 0.16% per cycle. The superior battery properties are further confirmed by cyclic voltammetry (CV) and impedance measurement.
通过在中空碳纳米球（CNS）互连薄膜上沉积硅和氧化铝制备的中空碳纳米球/硅/氧化铝（CNS/Si/Al₂O₃）核壳薄膜用作锂离子电池的负极材料。中空CNS薄膜充当三维导电基底，并为电化学循环过程中硅的体积膨胀提供空隙空间。Al₂O₃薄层有利于减少固体电解质界面（SEI）的形成。此外，设计的结构使硅和CNS之间保持牢固的面对面接触，这有利于快速电子传输。因此，该电极同时表现出高比容量和出色的容量保持率：在1 A g(-1)的电流密度下循环100次后为1560 mA h g(-1)，容量保持率为85%，平均每循环衰减率为0.16%。循环伏安法（CV）和阻抗测量进一步证实了其优异的电池性能。
