Transformation of sludge Si to nano-Si/SiOx structure by oxygen inward diffusion as precursor for high performance anodes in lithium ion batteries

Nanoscale Research Letters

Xiaoshan Li¹  Tiezheng Lv¹  Rui Zhu¹  Haojie Liao¹  Fei Han¹  Qiqi Hua¹  Dongyang Dai¹  Shijie Wang¹  Chengzhi Zhang¹  Shiguo Zhang¹ 

[1] College of Materials Science and Engineering, Hunan University;

关键词: Si sludge;    Oxygen diffusion;    Anode;    Lithium-ion battery;   

DOI  :  10.1186/s11671-018-2549-7

来源: DOAJ

【 摘 要 】

Abstract Although several Si/C composite structures have been proposed for high-performance lithium-ion batteries (LIBs), they have still suffered from expensive and complex processes of nano-Si production. Herein, a simple, controllable oxygen inward diffusion was utilized to transform Si sludge obtained from the photovoltaic (PV) industry into the nano-Si/SiOx structure as a result of the high diffusion efficiency of O inside Si and high surface area of the sludge. After further process, a yolk/shell Si/C structure was obtained as an anode material for LIBs. This composite demonstrated an excellent cycling stability, with a high reversible capacity (∼ 1250 mAh/g for 500 cycles), by void space originally left by the SiOx accommodate inner Si expansion. We believe this is a rather simple way to convert the waste Si into a valuable nano-Si for LIB applications.

【 授权许可】

Unknown