期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 2, 期 48, 页码 20494-20499出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta03448a
关键词
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资金
- 863 Project [2011AA050517]
- Natural Science Foundation of China [51002133]
- Zhejiang Provincial Natural Science Foundation of China [LY13E020003]
- Fundamental Research Funds for the Central Universities
We demonstrate the synthesis of Si@C three-dimensional porous structures derived from commercial magnesium silicide (Mg2Si) powder via simple annealing and acid pickling processes. When used as anode materials in lithium-ion batteries, the Si@C three-dimensional porous structures can give more lithiation sites and accommodate large volume changes during the lithiation/delithiation process, which leads to a high capacity and good cycling stability. As a result, a high reversible capacity of similar to 1700 mA h g(-1) was obtained at a current of 0.2 C (800 mA g(-1), 1 C = 4 A g(-1)) even after 70 cycles. The synthetic route described herein is a low-cost and large-scale method to produce high-performance Si anodes, which may facilitate their commercial applications.
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