Characterization of Si/Artificial Graphite Composite Made by Mechanical Alloying for Li-Ion Cells

Abstract:

Graphite is the widely used material as anode materials for Li-ion cells with a low theoretical capacity of 372 mAhg^-1. Silicon has a high theoretical capacity of 4212 mAhg^-1, but has a low intrinsic conductivity and its lower cycling life makes it unpractical. In this paper, silicon/artificial graphite composite was prepared by mechanical alloying to improve the cycle property of Si. On one hand, a new kind of alloy SiC was composited and composed as a coacervate, and the particle sizes of the silicon was reduced settled by mechanical alloying but the size of the new material become larger and larger with the proportion of artificial graphite increasing. On the other hand, the new material exhibits a better electrochemical performance, with the rate of its cyclic discharge capacity decreasing slowly.

• Periodical: Materials Science Forum (Volume 814)
• Pages: 71-75
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.814.71
• Online since: March 2015
• Authors: Ya Nan Guo, Xun Yong Jiang*, Ya Feng Ang
• Keywords: Artificial Graphite Composite, Electrochemical Performance, Mechanical Alloying, Silicon Graphite Composite

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