Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 302, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201700241
Keywords
coating; lithium-ion batteries; separator; shutdown temperature
Funding
- National Natural Science Foundation of China and Guangdong Province [U1401246]
- National Natural Science Foundation of China [51276044]
- Science and Technology Program of Guangdong Province of China [2014B010106005, 2015B010135011, 2015A050502047, 2016A020221031]
- Science and Technology Program of Guangzhou City of China [201508030018, 2016201604030040]
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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 approximate to 80 degrees 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.
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