期刊
ELECTROCHIMICA ACTA
卷 403, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2021.139580
关键词
Lithium-ion battery; Anode; Rice husks; Waste coffee grounds; Si@SiOx/C
资金
- SiLiKa Co. LTD [108A0244J4]
- Young Scholar Fellowship Program of the Ministry of Science and Technology (MOST), Taiwan [MOST110-2636-E-007-007]
- National Tsing Hua University [110Q2708E1]
- MOST [108B6120J4]
- Instrumentation Center at National Tsing Hua University [110Q2730E1]
In this study, Si@SiOx/C composite anode materials were synthesized using rice husks and waste coffee grounds as precursors. The optimized Si@SiOx/WCGC demonstrated high reversible capacity and good cycling stability, along with improved lithium-ion diffusivity when compared to pristine Si@SiOx. A full cell consisting of Si@SiOx/WCGC as the anode and LiNi0.5Mn1.5O4 as the cathode exhibited a high energy density.
In this study, rice husks and waste coffee grounds (WCGs) are utilized as precursors for synthesizing Si@SiOx/C composite anode materials. The magnesiothermic method is applied to reduce the nano-sized silica derived from rice husks to Si@SiOx. The Si@SiOx product is then mixed with WCGs and carbonized at a high temperature to produce Si@SiOx/WCGC. After optimization, the Si@SiOx/WCGC with a precursor ratio of 1:2 provides a high reversible capacity of 1125 mA h g(-1) at 100 mA g(-1). The capacity retention of Si@SiOx/WCGC (1:2) is 80% after 100 cycles at 1 A g(-1), which is considerably higher than that of pristine Si@SiOx (only 1.8%). In addition, the lithium-ion diffusivity of Si@SiO(x)increased from 2.7 x 10(-12) to 4.5 x 10(-11) cm2 s(-1) after it is combined with the WCGC. Furthermore, a full cell using Si@SiOx/WCGC (1:2) as the anode and LiNi0.5Mn1.5O4 as the cathode is assembled, which exhibits a high energy density of 396 W h kg(-1). This demonstrates that biowaste-derived Si@SiOx/WCGC is a promising and environ-mentally friendly anode material for lithium-ion batteries. (c) 2021 Elsevier Ltd. All rights reserved.
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