锂离子电池三维多孔硅/银复合材料负极设计及性能

doi:10.12066/j.issn.1007-2861.2061

Abstract

Abstract:

Silver-coated three-dimensional porous silicon (3D-porous-Si/Ag) composites were fabricated as anode materials for a lithium-ion battery via a metal-assisted chemical etching (MACE) method and an electroless plating method. Commercial silicon powders were used as substrate material. The composition, microstructure, and specific surface area of 3D-porous-Si and 3D-porous-Si/Ag were analysed via X-ray diffraction, field emission scanning electron microscopy, and surface area and porosity analyses. The electrochemical performance of the 3D-porous-Si/Ag composite was investigated. The results indicate that the aperture size and specific surface area of 3D-porous-Si were 12.5 nm and 6.083 m$^2$/g, respectively. These pores can be attributed to the narrow slit mesopores. The charge-discharge plot under a constant current of 420 mA/g indicates an initial discharge capacity of 2 822 mA$\cdot$h/g for the 3D-porous-Si/Ag electrode. The Coulombic efficiency reached 87.8% after the first cycle, and the capacity of the 3D-porous-Si/Ag electrode reached 832 mA$\cdot$h/g after 50 cycles. This is mainly because the 3D-porous microstructure and silver coating effectively restrain the volume expansion of silicon caused by the insertion of lithium ions. Moreover, the silver coating improves the electrical performance of the Si material.

Key words: metal-assisted chemical etching, electroless plating, silver-coated three-dimensional porous silicon composites, lithium-ion battery

CLC Number:

TM912

ZHU Delun, PENG Yuqing, BAI Ruicheng, LI Aijun, ZHAO Tianting, SUN Ningxia. Design and fabrication of silver-coated three-dimensional porous silicon composite anode with high performance for lithium ion battery[J]. Journal of Shanghai University（Natural Science Edition）, 2021, 27(1): 144-153.

Figures/Tables 9

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References 23

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Design and fabrication of silver-coated three-dimensional porous silicon composite anode with high performance for lithium ion battery

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