Journal
JOURNAL OF POWER SOURCES
Volume 195, Issue 24, Pages 8306-8310Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2010.06.112
Keywords
Lithium-ion batteries; Composite separators; Polyethylene; Binary nanoparticles; Silica; Poly(methyl methacrylate)
Funding
- Ministry of Education, Science and Technology [2009-0082083]
- Korean Government (MEST) [NRF-2009-C1AAA001-2009-0093307]
- Korean Government [2009-0066986]
- National Research Foundation of Korea [2009-0082083, 2009-0066986] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In an endeavour to improve not only the thermal shrinkage but also the electrochemical performance of separators in lithium-ion batteries, a novel composite separator is developed, i.e., a close-packed SiO2/poly(methyl methacrylate) (PMMA) binary nanoparticles-coated polyethylene (PE) separator. The introduction of SiO2 nanoparticles to the coating layer effectively suppresses thermal shrinkage of the composite separator. In contrast to a SiO2/PMMA coating layer having a film-shaped PM MA binder, the SiO2/PMMA binary nanoparticle coating layer employs PMMA particles as a binder. As a consequence, a highly porous structure. i.e., well-connected interstitial voids, is formed between the binary SiO2 and PMMA nanoparticles. The unique porous morphology allows favourable liquid electrolyte wettability and facile ionic conduction, which play a crucial role in improving cell performance such as the discharge capacity and the C-rate capability of the composite separator. (c) 2010 Elsevier B.V. All rights reserved.
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