Influences of oxygen content on the electrochemical performance of a-SiOx thin-film anodes

doi:10.1016/j.electacta.2018.06.095

	Influences of oxygen content on the electrochemical performance of a-SiOx thin-film anodes
	Meng, Xianglu 1,2; Huo, Hanyu 1; Cui, Zhonghui ; Guo, Xiangxin 3; Dong, Shaoming
刊名	ELECTROCHIMICA ACTA
	2018
卷号	283 页码:183
关键词	SiOx anodes Oxygen contents Cyclability and rate capability Lithium-ion batteries
ISSN号	0013-4686
DOI	10.1016/j.electacta.2018.06.095
英文摘要	Silicon suboxide (SiOx) is a promising anode material for lithium ion batteries (LIBs), due to its high specific capacity, small volume variation and superior cycle performance. Herein, we demonstrated the determining roles of oxygen contents on the behavior of SiOx upon lithium by means of thin-film type electrodes. The SiOx thin-film anodes with different oxygen contents were prepared by sputtering with Cu foil as substrates. XRD and Raman investigations reveal that these SiOx films are amorphous. As anodes, it is found that increasing oxygen contents in SiOx endows an enhanced cycle stability, but does harm to their initial Coulombic efficiency and capacity. Among all the a-SiOx film anodes (x = 0.4, 0.7, 1.1 and 1.5), the SiO0.7 electrode with a thickness of 450 nm exhibits excellent cycle performance and rate capability, with a high initial discharge capacity of 463 mu Ah cm(-2) mu m(-1) at the current density of 64 mu A cm(-2) and a high capacity retention of 90% after 300 cycles. This superior performance is ascribed to that the in-situ formed lithium oxide/silicates compounds during discharge effectively alleviates the large volume change of Si components, but also suppresses the electron leakage from the surface of active particles, shutting down the further decomposition of electrolytes and then the formation of thick solid interphase layer. These results will provide inspirations for designing high-performance Si based anodes for lithium ion batteries. (C) 2018 Elsevier Ltd. All rights reserved.
学科主题	Electrochemistry
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000441077900021
资助机构	The authors would like to thank the financial supports from the National Natural Science Foundation of China (Grant No. 51772314, 51771222, 51532002, and 51702346). ; The authors would like to thank the financial supports from the National Natural Science Foundation of China (Grant No. 51772314, 51771222, 51532002, and 51702346).
内容类型	期刊论文
源URL	[http://ir.sic.ac.cn/handle/331005/24692]
专题	中国科学院上海硅酸盐研究所
作者单位	1.Chinese Acad Sci, Shanghai Inst Ceram, State Key Lab High Performance Ceram & Superfine, Shanghai 200050, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.ShanghaiTech Univ, Coll Phys Sci & Technol, Shanghai 201210, Peoples R China 4.Qingdao Univ, Coll Phys, Ningxia Rd 308, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Meng, Xianglu,Huo, Hanyu,Cui, Zhonghui,et al. Influences of oxygen content on the electrochemical performance of a-SiOx thin-film anodes[J]. ELECTROCHIMICA ACTA,2018,283:183, 189.
APA	Meng, Xianglu,Huo, Hanyu,Cui, Zhonghui,Guo, Xiangxin,&Dong, Shaoming.(2018).Influences of oxygen content on the electrochemical performance of a-SiOx thin-film anodes.ELECTROCHIMICA ACTA,283,183.
MLA	Meng, Xianglu,et al."Influences of oxygen content on the electrochemical performance of a-SiOx thin-film anodes".ELECTROCHIMICA ACTA 283(2018):183.