Journal
JOURNAL OF POWER SOURCES
Volume 216, Issue -, Pages 42-47Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2012.05.052
Keywords
Lithium-ion batteries; High-safety/high-rate; Nonwoven composite separators; Colloidal silica particles; Evaporation-induced self-assembly; Nanoporous structure
Funding
- National Research Foundation of Korea Grant
- Korean Government (MEST) [NRF-2009-C1AAA001-2009-0093307]
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A facile approach to the fabrication of nanoporous structure-tuned nonwoven composite separators is demonstrated for application in high-safety/high-rate lithium-ion batteries. This strategy is based on the construction of silica (SiO2) colloidal particle-assisted nanoporous structure in a poly(ethylene terephthalate) (PET) nonwoven substrate. The nanoparticle arrangement arising from evaporation-induced self-assembly of SiO2 colloidal particles allows the evolution of the unusual nanoporous structure, i.e. well-connected interstitial voids formed between close-packed SiO2 particles adhered by styrene-butadiene rubber (SBR) binders. Meanwhile, the PET nonwoven serves as a mechanical support that contributes to suppressing thermal shrinkage of the nonwoven composite separator. The aforementioned structural novelty of the nonwoven composite separator plays a key role in providing the separator with advantageous characteristics (specifically, good electrolyte wettability, high ionic conductivity, and benign compatibility with electrodes), which leads to the better cell performance than a commercialized polyethylene (PE) separator. (c) 2012 Elsevier B.V. All rights reserved.
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