期刊
JOURNAL OF POWER SOURCES
卷 189, 期 1, 页码 121-126出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2008.10.041
关键词
Silicon-nickel-graphite; Lithium ion battery; Anode; Composite; HEMM
A new type of nanosized silicon-nickel-graphite (Si-Ni-G) composite was prepared by high energy mechanical milling (HEMM) and pyrolysis using SiO as the precursor of Si for the first time. X-ray diffraction (XRD), high-resolution transmission electron microscope (H RTEM) and scanning electron microscopy (SEM) were used to determine the phases obtained and to observe the microstructure and distribution of the composite. The composite powders consisted of Si, Ni, SiO2, NiO and a series of Si-Ni alloys. The formation of the inactive SiO2 and Si-Ni alloy phases could accommodate the large volume changes of the active particles during cycling. In addition, cyclic voltammetry (CV) and galvanostatic discharge/charge tests were carried out to characterize the electrochemical properties of the composite. The composite electrodes exhibited an initial discharge and charge capacity of 1450.3 and 956.4 mAh g(-1), respectively, maintaining a reversible capacity of above 900 mAh g(-1) for nearly 60 cycles. (C) 2008 Elsevier B.V. All rights reserved.
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