Enhanced wettability and thermal stability of polypropylene separators by organic–inorganic coating layer for lithium‐ion batteries

ABSTRACT Organic–inorganic coating polypropylene separators were developed by introducing SiO2 nanoparticles through sol–gel process, where polydopamine was used as an intermediate layer. Scanning electron microscopy results showed the coating layers have highly porous structure, which was beneficia...

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Bibliographic Details
Published in:Journal of applied polymer science 2018-07, Vol.135 (28), p.n/a
Main Authors: Chao, Chun‐Ying, Feng, Ye‐Fei, Hua, Kai, Li, Hao, Wu, Li‐Jun, Zhou, Yi‐Sha, Dong, Zhen‐Wei
Format: Article
Language:English
Subjects:
ceramic coating
Electrolytic cells
Inorganic coatings
Interface stability
Ion currents
Lithium-ion batteries
lithium‐ion battery
Materials science
Polymers
Polypropylene
Scanning electron microscopy
separator
Separators
Silicon dioxide
Sol-gel processes
Thermal stability
Wettability
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Summary:ABSTRACT Organic–inorganic coating polypropylene separators were developed by introducing SiO2 nanoparticles through sol–gel process, where polydopamine was used as an intermediate layer. Scanning electron microscopy results showed the coating layers have highly porous structure, which was beneficial for liquid electrolyte uptake. Compared with pristine polypropylene separator, the ceramic separators showed improved thermal stability, higher ionic conductivity, and lower interfacial impedance. The cells employing the ceramic separators delivers excellent discharge capacity (retention = 75%) and coulombic efficiency up to 98% at 2 °C rate after 100 cycles. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46478.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.46478