Journal
IONICS
Volume 19, Issue 3, Pages 401-407Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-012-0762-4
Keywords
Lithium ion batteries; Anode materials; Nanosilicon; Polypyrrole; Silver
Funding
- National Natural Science Foundation of China (NSFC) [20506024]
- State Key Development Program for Basic Research of China [2007CB216409]
- Zhejiang Provincial Natural Science Foundation of China [LQ12B01003]
- Zhejiang University of Technology start-up fund [101009529]
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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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