Highly thermostable expanded polytetrafluoroethylene separator with mussel-inspired silica coating for advanced Li-ion batteries

doi:10.1016/j.jpowsour.2020.228403

CORC > 金属研究所 > 中国科学院金属研究所

	Highly thermostable expanded polytetrafluoroethylene separator with mussel-inspired silica coating for advanced Li-ion batteries
	Zhang, Kaiyue 2,3; Xiao, Wei 1,2; Li, Xiangrong 2; Liu, Jianguo 2,3; Yan, Chuanwei 2,3
刊名	JOURNAL OF POWER SOURCES
	2020-08-31
卷号	468 页码:10
关键词	Expanded polytetrafluoroethylene Dopamine Silica Li-ion battery separator Thermal stability
ISSN号	0378-7753
DOI	10.1016/j.jpowsour.2020.228403
通讯作者	Xiao, Wei(wxiao@imr.ac.cn)
英文摘要	The separator as an important component in Li-ion batteries faces increasing challenges with the next-generation batteries towards higher energy density and longer life. An urgent task is to simultaneously achieve fire resistance, high thermal stability and electrolyte affinity for polymeric separators. Herein, to address all these needs, we report a mussel-inspired silica-coated expanded polytetrafluoroethylene separator fabricated by a multi-step synthesis process of dopamine self-polymerization and subsequent silica in-situ self-assembly. The separator inherits the advantages of expanded polytetrafluoroethylene matrix in terms of significant fire resistance and unique porous structure, especially exhibiting superior thermal dimensional stability up to 300 degrees C. Additionally, the polydopamine layer acts as a double-sided tape sticking expanded polytetrafluoroethylene matrix and silica layer without any polymeric binders avoiding excessive pore blocking. More significantly, the in-situ grown silica layer combined with the polydopamine layer completely solves the Achilles' heel of polytetrafluoroethylene material to endow the separators with excellent electrolyte affinity. Benefiting from such structural uniqueness, the LiFePO4 half-cell assembled with the separator shows an enhanced discharge capacity of 157.1 mA h g(-1) at 0.2C and C-rate capacity of 115.6 mA h g(-1) at 5C. Therefore, this study provides inspiration for the expanded polytetrafluoroethylene-based separators facing the next-generation Li-ion batteries.
资助项目	National Natural Science Foundation of China[21676282] ; National Natural Science Foundation of China[21805290] ; Natural Science Foundation of Liaoning[20180510039] ; Shenyang Science and Technology Project[18013051]
WOS研究方向	Chemistry ; Electrochemistry ; Energy & Fuels ; Materials Science
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000543021900032
资助机构	National Natural Science Foundation of China ; Natural Science Foundation of Liaoning ; Shenyang Science and Technology Project
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/139443]
专题	金属研究所_中国科学院金属研究所
通讯作者	Xiao, Wei
作者单位	1.Liaoning Shihua Univ, Chem Engn & Environm Sci, Fushun 113001, Peoples R China 2.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China 3.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Kaiyue,Xiao, Wei,Li, Xiangrong,et al. Highly thermostable expanded polytetrafluoroethylene separator with mussel-inspired silica coating for advanced Li-ion batteries[J]. JOURNAL OF POWER SOURCES,2020,468:10.
APA	Zhang, Kaiyue,Xiao, Wei,Li, Xiangrong,Liu, Jianguo,&Yan, Chuanwei.(2020).Highly thermostable expanded polytetrafluoroethylene separator with mussel-inspired silica coating for advanced Li-ion batteries.JOURNAL OF POWER SOURCES,468,10.
MLA	Zhang, Kaiyue,et al."Highly thermostable expanded polytetrafluoroethylene separator with mussel-inspired silica coating for advanced Li-ion batteries".JOURNAL OF POWER SOURCES 468(2020):10.