Facile manufacture technique for lithium-ion batteries composite separator via online construction of fumed SiO2 coating

Lei Ding; Ning Yan; Sihang Zhang; Ruizhang Xu; Tong Wu; Feng Yang; Ya Cao; Ming Xiang

Materials & Design (Mar 2022)

Facile manufacture technique for lithium-ion batteries composite separator via online construction of fumed SiO2 coating

Lei Ding,
Ning Yan,
Sihang Zhang,
Ruizhang Xu,
Tong Wu,
Feng Yang,
Ya Cao,
Ming Xiang

Affiliations

Lei Ding: Shandong Key Laboratory of Chemical Energy Storage and New Battery Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, China; Corresponding author.
Ning Yan: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, China
Sihang Zhang: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, China
Ruizhang Xu: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, Sichuan University, Chengdu, China
Tong Wu: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, China
Feng Yang: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, China
Ya Cao: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, China
Ming Xiang: State Key Laboratory of Polymer Materials Engineering, College of Polymer Science and Engineering, Sichuan University, Chengdu, China

Journal volume & issue: Vol. 215
p. 110476

Abstract

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Booming aspiration of advanced energy storage equipment elevates lithium-ion batteries vastly. Whereas separator with inferior porous structure and compatibility mismatches battery internal medium and raises ion transference rampart. Herein, fumed SiO2 compound separator is designed via ingenious bidirectional drawing technique to optimize the porous structure and realize fumed SiO2 coating online construction during the pore formation process of β-crystal polypropylene (β-iPP) synchronously. Crystal structure measurement, pore construction diagnosis, and physical properties tests disclose that the fumed SiO2 thins coarse fibril structure and homogenizes porous construction of separator. The de-bonding of fumed SiO2/β-iPP interfaces also remains SiO2 on the top-surface and pore internal wall of separator and thus realizes the SiO2 coating online construction, which eliminate the steps required by coating after fabrication of the separator and greatly reduce the production difficulty and cost. Also, the prepared composite separators present reinforced thermal dimensional stability and electrolyte wettability benefited by the SiO2 coating. Electrochemical impedance spectroscopy and cycle tests further uncover that hydrophilic SiO2 nanoparticles lower lithium-ion migration rampart within separator and enhance compatibility with electrodes, which stifles cell resistances and gives LIBs superior high ratio discharge property and cycling durability.

Published in Materials & Design

ISSN: 0264-1275 (Print); 1873-4197 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/materials-and-design

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