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Novel Core–Shell PS‐ co ‐PBA@SiO 2 Nanoparticles Coated on PP Separator as “Thermal Shutdown Switch” for High Safety Lithium‐Ion Batteries
Author(s) -
Liao Haiyang,
Zhang Haiyan,
Qin Gai,
Hong Haoqun,
Li Zhenghui,
Lin Yingxi,
Li Liuqing
Publication year - 2017
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201700241
Subject(s) - thermal runaway , materials science , separator (oil production) , coating , nanoparticle , composite material , chemical engineering , nanotechnology , battery (electricity) , power (physics) , physics , quantum mechanics , engineering , thermodynamics
Thermal runaway is a hazardous behavior of lithium‐ion batteries under extreme conditions and is mainly cause for restraint of its commercial applications in development of high‐power and high‐rate lithium‐ion batteries. In this paper, a new dual‐functions coating layer fabricated from polystyrene‐poly(butyl acrylate) copolymer encapsulated silica nanoparticles as “thermal shutdown switch” with a reasonable shutdown temperature of ≈80 °C is designed and coated on polypropylene separator. The shell polymer owing to its self‐adhesion upon glass transition temperature ( T g ) can retard off the Li + conduction between the electrodes, thus prevents cell from thermal runaway, the core nanoparticles protect the separator from significantly thermal shrinkage when the cell temperature keeps going up. Moreover, the coated separator has no negative affection on the normal electrochemical performance of the batteries, thereby implying that this coating layer provides a simple and effective approach to control the safety of commercial lithium‐ion batteries by internal self‐protecting.