Journal
CHEMICAL ENGINEERING JOURNAL
Volume 430, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132678
Keywords
Lithium-sulfur battery; Thermal shutdown separator; Microspheres; Thermal Stability
Categories
Funding
- National Key Research and Development Program of China New Energy Project for Electric Vehicle [2016YFB0100204]
- National Natural Science Foundation of China [51772030]
- Beijing Outstanding Young Scientists Program [BJJWZYJH01201910007023]
- Beijing Institute of Technology Research Fund Program for Young Scholars
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By coating separators with ethylene-vinyl acetate copolymer microspheres, the thermal stability of lithium-sulfur batteries is enhanced. The thermal shutdown separators made from EVA/PP have fast thermal response, excellent porosity, and electrolyte wettability, reducing the risk of thermal runaway effectively.
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 degrees 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.
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