期刊
NANO ENERGY
卷 4, 期 -, 页码 31-38出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2013.12.002
关键词
Silica; Nano-silicon anode; Magnesiothermic reduction; Polyethyleneimine; Biomimetic
类别
资金
- NSFC [51325203]
- 085 Project of Shanghai University
- Grants-in-Aid for Scientific Research [25288058] Funding Source: KAKEN
Nanostructured silicon (Si) is a promising candidate for use in lithium ion batteries. In this work, one-dimensional SiO2 was obtained using linear polyethyleneimine (LPEI) as a biomimetic template/scaffold/catalyst, which was subsequently employed to fabricate nanostructured Si with a size of less than 10 nm in a SiO2 matrix using a solid-solid magnesiothermic reaction at a relatively low temperature of 500 C. This procedure proved to be cost-effective and highyielding and generated a product that could withstand a significant Si volume change during lithium insertion/extraction by combining the advantages of Si nanostructures with the buffer effect of the SiO2 matrix. In this manner, excellent cycling stability and a discharge capacity of more than 900 mAh/g were observed after 50 cycles. This work expands the structure-derived applications of bioinspired/biomimetic silica. (C) 2013 Elsevier Ltd. All rights reserved.
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