Nano SiO2 particle formation and deposition on polypropylene separators for lithium-ion batteries

JOURNAL OF POWER SOURCES

卷:206

Article

Fu, Dong¹  Luan, Ben¹  Argue, Steve²  Bureau, Martin N.³  Davidson, Isobel J.² 

[1] Natl Res Council Canada, Inst Ind Mat, Ctr Automot Mat Mfg, London, ON N6G 4X8, Canada

[2] Natl Res Council Canada, Inst Chem Proc & Environm Technol, Ottawa, ON K1A 0R6, Canada

[3] Natl Res Council Canada, Inst Ind Mat, Boucherville, PQ J4B 6Y4, Canada

关键词: Lithium-ion batteries;    Separators;    Silica coating;    Rate capability;    Thermal shrinkage;   

DOI  :  10.1016/j.jpowsour.2011.10.130

来源: Elsevier

【 摘 要 】

The novelty of this work is the formation and deposition of SiO2, as opposed to deposition using commercially available SiO2 powder suspension in the solution, to form ceramic coating on polypropylene (PP) separators for lithium-ion battery. The formation of SiO2 nanoparticles with uniform particle size is accomplished through direct hydrolysis of tetraethyl orthosilicate (TEOS), while the deposition of the formed SiO2 on PP separators was conducted in the same solution containing polyvinylidene fluoridehexafluoropropylene (PVDF-HFP) as binders and acetone as the solvent. The effects of the ceramic coating on the surface morphology, tensile strength, contact angles, electrolyte uptake, thermal shrinkage of the PP separators and the cell performances such as battery rate capability and Coulombic efficiency were investigated. The coated separators show significant reduction in thermal shrinkage and improvement in tensile strength, contact angles, electrolyte uptake and battery performance as compared to the plain PP separator. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.

【 授权许可】

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