Synthesis and Characterization of Si/C Composite Anode by Electrostatic Spinning Method

doi:10.3724/SP.J.1077.2014.13256

Abstract

Abstract: Si/C composite anode material was successfully fabricated by an electrospinning method using PVP as macromolecule polymer collocation. The carbon derived from sintering PVP at high temperature plays a role in buffering size skeleton of silicon, which can effectively improve the volume expansion and pulverization problem of silicon at charge-discharge. The structure and morphology of the as-prepared samples were characterized by X-ray diffraction (XRD), Raman spectrum (Raman) and scanning electron microscope (SEM). The results show that the distribution of composite material is fibrous with diameter in the range of 300–400 nm. A “wheat like” structure is formed by Si particles distributed on the amorphous carbon fibers. The electrochemical test demonstrates that the irreversible capacity at first charge-discharge process is 294.9 mAh/g, which is due to the formation of solid electrolyte interface (SEI) film between the electrode and electrolyte. In addition, this composite material has very high columbic efficiency and excellent cycle stability, both at a low (0.1C, 0.2C and 0.5C) and high (1.0C and 2.0C) rates.

Key words: lithium-ion battery, Si/C composite anode, electrostatic spinning, nanofibers

CLC Number:

TM912

QU Chao-Qun, WANG Yu-Hui, JIANG Tao, BIE Xiao-Fei. Synthesis and Characterization of Si/C Composite Anode by Electrostatic Spinning Method[J]. Journal of Inorganic Materials, 2014, 29(2): 197-202.

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