Optimizing the function of SiOx in the porous Si/SiOx network via a controllable magnesiothermic reduction for enhanced lithium storage

doi:10.1016/j.jallcom.2021.159914

	Optimizing the function of SiOx in the porous Si/SiOx network via a controllable magnesiothermic reduction for enhanced lithium storage
	Zhou, Chunyue 1,2,3; Liu, Jiuhao 1,3; Gong, Xuzhong 1,3; Wang, Zhi 1,2,3
刊名	JOURNAL OF ALLOYS AND COMPOUNDS
	2021-09-05
卷号	874 页码:10
关键词	Lithium-ion batteries Thermal reduction Regulation Silicon anodes
ISSN号	0925-8388
DOI	10.1016/j.jallcom.2021.159914
英文摘要	Silicon anodes hold promise to be a possible candidate to replace graphitic carbon used in practical applications. However, it undergoes a huge volume change in the process of electrochemical alloying, which leads to electrical isolation in the long-term cycle. In this work, we focus on regulating the thermal reduction reaction to change the distribution and relative content of residual SiOx in the network of active materials. By analyzing the structure and composition of the product under different reaction conditions combined with electrochemical performances, it is confirmed that there is still a small amount of residual SiOx embedded in the reduced silicon nanoparticles for the completely reduced products which have a positive effect on the cycle stability, while the SiOx core accelerates the particle breakage under the incomplete reduction condition, which is further confirmed by micrograph of the electrode after cycling. Specifically, 628 mAh g-1 of specific capacity can be retained after 100 cycles for almost pure silicon products reduced by 8 h at 660 degrees C, which is better than commercial nanometer silicon anodes. This work provides a theoretical guidance for the construction of silicon anode by thermal reduction, and is conducive to the expansion of this method for the synthesis of practical silicon matrix. (c) 2021 Elsevier B.V. All rights reserved.
资助项目	National Key R&D Program of China[2018YFC1901801] ; National Natural Science Foundation of China[52074255] ; National Natural Science Foundation of China[51704271] ; National Natural Science Foundation of China[U1702251]
WOS关键词	ION BATTERY ANODES ; AT-C ; NANOSTRUCTURED SILICON ; PERFORMANCE ; CARBON ; COMPOSITES ; STRATEGY
WOS研究方向	Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
语种	英语
出版者	ELSEVIER SCIENCE SA
WOS记录号	WOS:000653090500004
资助机构	National Key R&D Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.ipe.ac.cn/handle/122111/48739]
专题	中国科学院过程工程研究所
通讯作者	Liu, Jiuhao; Wang, Zhi
作者单位	1.Chinese Acad Sci, Inst Proc Engn, Key Lab Green Proc & Engn, Natl Engn Lab Hydromet Cleaner Prod Technol, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Chem Engn, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Innovat Acad Green Manufacture, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Zhou, Chunyue,Liu, Jiuhao,Gong, Xuzhong,et al. Optimizing the function of SiOx in the porous Si/SiOx network via a controllable magnesiothermic reduction for enhanced lithium storage[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2021,874:10.
APA	Zhou, Chunyue,Liu, Jiuhao,Gong, Xuzhong,&Wang, Zhi.(2021).Optimizing the function of SiOx in the porous Si/SiOx network via a controllable magnesiothermic reduction for enhanced lithium storage.JOURNAL OF ALLOYS AND COMPOUNDS,874,10.
MLA	Zhou, Chunyue,et al."Optimizing the function of SiOx in the porous Si/SiOx network via a controllable magnesiothermic reduction for enhanced lithium storage".JOURNAL OF ALLOYS AND COMPOUNDS 874(2021):10.