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Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems

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Colloidal silica nanoparticle-assisted structural control of cellulose nanofiber paper separators for lithium-ion batteries

Cited 2 times inthomson ciCited 2 times inthomson ci
Title
Colloidal silica nanoparticle-assisted structural control of cellulose nanofiber paper separators for lithium-ion batteries
Author
Kim, Jeong-HoonKim, Jung-HwanChoi, Eun-SunYu, Hyung KyunKim, Jong HunWu, QinglinChun, Sang-JinLee, Sun-YoungLee, Sang-Young
Keywords
Cellulose nanofibers; Colloidal silica; Lithium-ion battery; Porous structures; Spacer particles
Issue Date
201311
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v.242, no., pp.533 - 540
Abstract
Porous structure-tuned cellulose nanofiber paper separators (designated as S-CNP separators) are demonstrated as a promising alternative to commercial polyolefin separators for use in lithium-ion batteries. A new architectural strategy based on colloidal silica (SiO2) nanoparticle-assisted structural control is presented to overcome the difficulty in forming controllable porous structure of pure cellulose nanofiber paper separators (designated as CNP separators) from densely-packed cellulose nanofibers (CNFs). The new S-CNP separators proposed herein incorporate SiO2 nanoparticles as a CNF-disassembling agent (i.e., as non-conductive spacer particles). This structural uniqueness allows loose packing of CNFs, thereby facilitating the evolution of more porous structure. The unusual porous structure of S-CNP separators can be fine-tuned by varying SiO2 contents in the CNF suspension. Notably, the S-CNP separator (fabricated with 5 wt.% SiO2 content) exhibits the highest ionic conduction due to the well-balanced combination of nanoporous structure and separator thickness, thus contributing to excellent cell performance. This study underlines that the colloidal SiO2 nanoparticle-directed structural tuning of CNPs offers a promising route for the fabrication of advanced paper separators with optimized attributes and functionality.
URI
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DOI
http://dx.doi.org/10.1016/j.jpowsour.2013.05.142
ISSN
0378-7753
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