A copolymer microspheres-coated separator to enhance thermal stability of lithium-sulfur batteries

Zhuangzhuang Wei, Nanxiang Zhang, Tao Feng, Feng Wu, Teng Zhao*, Renjie Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)

Abstract

To enhance the thermal stability of lithium-sulfur batteries, separators are coated by ethylene-vinyl acetate copolymer microspheres (EVAs) and the thermal response behavior of ethylene-vinyl acetate copolymer microspheres/polypropylene separator (EVAs/PP) in lithium-sulfur batteries are investigated. The EVAs have a suitable melting point and a fast kinetic rate of thermal reaction. Thermal safety tests show that the prepared EVAs/PP thermal shutdown separators can quickly respond to the temperature change inside the lithium-sulfur battery under overheating conditions (85 °C), forming an insulating layer to protect the lithium-sulfur battery from thermal runaway hazards. In addition, EVAs/PP thermal shutdown separators have excellent porosity and electrolyte wettability compared to commercial PP separators. Conventional electrochemical performance tests indicate that EVAs/PP thermal shutdown separators applied in lithium-sulfur batteries exhibit electrochemical performance almost similar to that of PP separators. Due to the simple preparation and low cost, EVAs/PP thermal shutdown separator is expected to be a safe and excellent performance separator for lithium-sulfur battery applications.

Original languageEnglish
Article number132678
JournalChemical Engineering Journal
Volume430
DOIs
Publication statusPublished - 15 Feb 2022

Keywords

  • Lithium-sulfur battery
  • Microspheres
  • Thermal Stability
  • Thermal shutdown separator

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Wei, Z., Zhang, N., Feng, T., Wu, F., Zhao, T., & Chen, R. (2022). A copolymer microspheres-coated separator to enhance thermal stability of lithium-sulfur batteries. Chemical Engineering Journal, 430, Article 132678. https://doi.org/10.1016/j.cej.2021.132678