Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/61507
Title: Synthesis of nano-sized silicon from natural halloysite clay and its high performance as anode for lithium-ion batteries
Authors: Zhou, X
Wu, L
Yang, J
Tang, J
Xi, L
Wang, B
Keywords: Halloysite clay
Lithium-ion battery anodes
Magnesiothermic reduction
Silicon
Issue Date: 2016
Publisher: Elsevier
Source: Journal of power sources, 2016, v. 324, p. 33-40 How to cite?
Journal: Journal of power sources 
Abstract: Recently, nanostructured Si has been intensively studied as a promising anode candidate for lithium ion batteries due to its ultrahigh capacity. However, the downsizing of Si to nanoscale dimension is often impeded by complicated and expensive methods. In this work, natural halloysite clay was utilized for the production of Si nanoparticles through selective acid etching and modified magnesiothermic reduction processes. The physical and chemical changes of these samples during the various processes have been analyzed. The as-prepared H-Si from halloysite clay is composed of many interconnected Si nanoparticles with an average diameter of 20-50 nm. Owing to the small size and porous nature, the H-Si nanoparticles exhibit a satisfactory performance as an anode for lithium ion batteries. Without further modification, a stable capacity over 2200 mAh g-1 at a rate of 0.2 C after 100 cycles and a reversible capacity above 800 mAh g-1 at a rate of 1 C after 1000 cycles can be obtained. As a result, this synthetic route is cost-effective and can be scaled up for mass production of Si nanoparticles, which may facilitate valuable utilization of halloysite clay and further commercial application of Si-based anode materials.
URI: http://hdl.handle.net/10397/61507
ISSN: 0378-7753
EISSN: 1873-2755
DOI: 10.1016/j.jpowsour.2016.05.058
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