期刊
JOURNAL OF POWER SOURCES
卷 256, 期 -, 页码 32-36出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2014.01.036
关键词
Li-ion batteries; Silicon electrodes; Si wafer; Ball milling
资金
- Agence Nationale de la Recherche (ANR) of France (BASILIC project)
- Natural Science and Engineering Research Council (NSERC) of Canada
High-energy ball milling is used to recycle Si wafers to produce Si powders for negative electrodes of Li-ion batteries. The resulting Si powder consists in micrometric Si agglomerates made of cold-welded submicrometric nanocrystalline Si particles. Silicon-based composite electrodes prepared with ball-milled Si wafer can achieve more than 900 cycles with a capacity of 1200 mAh g(-1), of Si (880 mAh g(-1) of electrode) and a coulombic efficiency higher than 99%. This excellent electrochemical performance lies in the use of nanostructured Si produced by ball milling, the electrode formulation in a pH 3 buffer solution with CMC as binder and the use of FEC/VC additives in the electrolyte. This work opens the way to an economically attractive recycling of Si wastes. (C) 2014 Elsevier B.V. All rights reserved.
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