LiStableNanoporousSilicon.pdf

Citeable URL: https://ir.library.oregonstate.edu/concern/articles/2r36v0354

Descriptions

Attribute Name	Values
Creator	Li, Xiaolin Yan, Pengfei Arey, Bruce W. Luo, Wei Ji, Xiulei Wang, Chongmin Liu, Jun Zhang, Ji-Guang
Abstract	Porous silicon prepared by low-cost and scalable magnesiothermic reactions is a promising anode material for Li-ion batteries; yet, retaining good cycling stability for such materials in electrodes of practical loading remains a challenge. Here, we engineered the nanoporous silicon from a modified magnesiothermic reaction by controlled surface oxidization forming a <5 nm oxide layer on the 10–20 nm Si nanocrystallites. High loading electrodes of ~3 mAh/cm² demonstrates stable cycling with ~80% capacity retention over 150 cycles. The specific discharge capacity based on the total electrode weight is ~1000 mAh/g at the lithiation/delithiation current density of 0.5/0.75 mA/cm². This work reveals the importance of the surface treatment on nanostructured Si, which will lead to a well-controlled ratio of silicon and surface oxide layer and provide guidance on further improvement on silicon-based anode materials. Keywords: Porous silicon, Magnesiothermic reaction, Silicon anode, Lithium ion batteries
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