Interfacial engineering of polypropylene separator with outstanding high-temperature stability for highly safe and stable lithium-sulfur batteries

Mao Yang; Jue Nan; Wei Chen; Anjun Hu; He Sun; Yuanfu Chen; Chunyang Wu

Electrochemistry Communications (Apr 2021)

Interfacial engineering of polypropylene separator with outstanding high-temperature stability for highly safe and stable lithium-sulfur batteries

Mao Yang,
Jue Nan,
Wei Chen,
Anjun Hu,
He Sun,
Yuanfu Chen,
Chunyang Wu

Affiliations

Mao Yang: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Jue Nan: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Wei Chen: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Anjun Hu: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
He Sun: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Yuanfu Chen: State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China
Chunyang Wu: Corresponding author.; State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China

Journal volume & issue: Vol. 125
p. 106971

Abstract

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The thermal shrinkage of commercial polypropylene (PP) separator at high temperature seriously restricts the development of safe and stable lithium-sulfur (Li-S) batteries. To address such issue, herein, we present an interfacial engineering strategy by coating conductive polypyrrole (PPY) modified lithium-montmorillonite (PPY/Li-MMT) on the PP separator. The PPY/Li-MMT can service as an effective heat release layer to enhance the high-temperature stability of Li-S batteries. The engineered PP separator exhibits superior performance: it shows nearly no thermal shrinkage even up to 150 °C. Most importantly, the interface engineered separator has not be punctured during the hot piercing testing and the Li-S batteries deliver outstanding thermal stability even at 80 °C. In addition, the PPY/Li-MMT modified PP separator owns very high electrolyte uptake of 348.6%, large ionic conductivity of 3.63 mS cm−1 and stable performance over 600 cycles. This work provides an effective interfacial engineering strategy by coating PPY/Li-MMT interlayer to significantly improve the electrochemical performance and particularly the high-temperature stability of Li-S batteries.

Published in Electrochemistry Communications

ISSN: 1388-2481 (Print); 1873-1902 (Online)
Publisher: Elsevier
Country of publisher: United States
LCC subjects: Technology: Chemical technology: Industrial electrochemistry; Science: Chemistry
Website: https://www.journals.elsevier.com/electrochemistry-communications

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