Preparation of Si-PPy-Ag composites and their electrochemical performance as anode for lithium-ion batteries |
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Authors: | Jinhan Yao Zhitao Jia Pinjie Zhang Chaoqi Shen Jianbo Wang Kondo-Francois Aguey-Zinsou Lianbang Wang |
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Institution: | 1. State Key Laboratory Breeding Base of Green Chemistry Synthesis Technology, College of Chemical Engineering and Material Science, Zhejiang University of Technology, Hangzhou, Zhejiang, People’s Republic of China 2. School of Chemical Engineering, University of New South Wales, Sydney, Australia
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Abstract: | The nanosilicon connected by polypyrrole (PPy) and silver (Ag) particles was simply synthesized by a chemical polymerization process in order to prepare Si-based anodes for Li-ion batteries. The phase structure, surface morphology, and electrochemical properties of the as-synthesized powders were analyzed by X-ray diffraction, FT-IR, scanning electron microscopy, and galvanostatic charge/discharge measurements. The cycle stability of the Si-PPy-Ag composites was greatly enhanced compared with the pure nanosilicon. A high capacity of more than 823 mA h g?1 was maintained after 100 cycles. The improved electrochemical characteristics are attributed to the volume buffering effect as well as effective electronic conductivity of the polypyrrole and silver in the composite electrode. |
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