Journal
PLASMA SCIENCE & TECHNOLOGY
Volume 18, Issue 4, Pages 424-429Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1009-0630/18/4/16
Keywords
microporous polypropylene membrane; lithium-ion battery; plasma treatment and SiOx coating
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Funding
- National Natural Science Foundation of China [11175024, 11375031]
- Beijing Institute of Graphic and Communication Key Project of China [23190113051]
- Shenzhen Science and Technology Innovation Committee of China [JCYJ20130329181509637]
- BJNSFC [KZ201510015014]
- State Key Laboratory of Electrical Insulation and Power Equipment of China [EIPE15208]
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To reduce the thermal shrinkage of the polymeric separators and improve the safety of the Li-ion batteries, plasma treatment and plasma enhanced vapor chemical deposition (PECVD) of SiOx-like are carried out on polypropylene (PP) separators, respectively. Critical parameters for separator properties, such as the thermal shrinkage rate, porosity, wettability, and mechanical strength, are evaluated on the plasma treated PP membranes. O-2 plasma treatment is found to remarkably improve the wettability, porosity and electrolyte uptake. PECVD SiOx-like coatings are found to be able to effectively reduce the thermal shrinkage rate of the membranes and increase the ionic conductivity. The electrolyte-philicity of the SiOx-like coating surface can be tuned by the varying O-2 content in the gas mixture during the deposition. Though still acceptable, the mechanical strength is reduced after PECVD, which is due to the plasma etching.
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