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Highly thermostable expanded polytetrafluoroethylene separator with mussel-inspired silica coating for advanced Li-ion batteries
Zhang, Kaiyue1,2; Xiao, Wei1,3; Li, Xiangrong1; Liu, Jianguo1,2; Yan, Chuanwei1,2
Corresponding AuthorXiao, Wei(wxiao@imr.ac.cn)
2020-08-31
Source PublicationJOURNAL OF POWER SOURCES
ISSN0378-7753
Volume468Pages:10
AbstractThe 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.
KeywordExpanded polytetrafluoroethylene Dopamine Silica Li-ion battery separator Thermal stability
Funding OrganizationNational Natural Science Foundation of China ; Natural Science Foundation of Liaoning ; Shenyang Science and Technology Project
DOI10.1016/j.jpowsour.2020.228403
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaChemistry ; Electrochemistry ; Energy & Fuels ; Materials Science
WOS SubjectChemistry, Physical ; Electrochemistry ; Energy & Fuels ; Materials Science, Multidisciplinary
WOS IDWOS:000543021900032
PublisherELSEVIER
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imr.ac.cn/handle/321006/139447
Collection中国科学院金属研究所
Corresponding AuthorXiao, Wei
Affiliation1.Chinese Acad Sci, Inst Met Res, Shenyang 110016, Peoples R China
2.Univ Sci & Technol China, Sch Mat Sci & Engn, Shenyang 110016, Peoples R China
3.Liaoning Shihua Univ, Chem Engn & Environm Sci, Fushun 113001, Peoples R China
Recommended Citation
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.
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