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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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Eco-friendly cellulose nanofiber paper-derived separator membranes featuring tunable nanoporous network channels for lithium-ion batteries

Cited 31 times inthomson ciCited 22 times inthomson ci
Title
Eco-friendly cellulose nanofiber paper-derived separator membranes featuring tunable nanoporous network channels for lithium-ion batteries
Author
Chun, Sang-JinChoi, Eun-SunLee, Eun-HoKim, Jung HyeunLee, Sun-YoungLee, Sang-Young
Keywords
Advanced materials; Application fields; Cell performance; Cellulose fiber; Cellulose nanofibers; Composition ratio; Crystalline domains; Dense packing; Eco-friendly; Electrochemical performance; Isopropyl alcohols; Labyrinth structure; Lithium-ion battery; Mechanical/thermal properties; Nano scale; Nano-meter-scale; Nanoporous networks; Nanoporous structures; Paper battery; Porous structures; Potential applications; Salient features; Solvent mixtures; Sustainable building
Issue Date
2012
Publisher
ROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY, v.22, no.32, pp.16618 - 16626
Abstract
Eco-friendly cellulose nanofibers (CNFs), a core constituent of cellulose, have garnered increasing attention as a promising sustainable building block source for advanced materials in various application fields. In the present study, we successfully fabricate a cellulose nanofiber paper from a CNF suspension and explore its potential application to a separator membrane for lithium-ion batteries. In contrast to macro/microscopic cellulose fibers that have been commonly used for typical papers, the CNFs are characterized by the nanometer-scale diameter/length up to several micrometers and highly crystalline domains, contributing to excellent mechanical/thermal properties and nanoporous structure evolution. A salient feature of the cellulose nanofiber paper-derived separator membrane (referred to as "CNP separator") is an electrolyte-philic, nanoscale labyrinth structure established between closely piled CNFs. The unusual porous structure is fine-tuned by varying the composition ratio of the solvent mixture (= isopropyl alcohol (IPA)-water) in the CNF suspension, wherein IPA is introduced as a CNF-disassembling agent while water promotes dense packing of CNFs. Based on a solid understanding of separator characteristics, electrochemical performances of cells assembled with the CNP separators are investigated. Notably, the CNP separator manufactured with IPA-water = 95/5 (vol/vol%) exhibits highly interconnected nanoporous network channels and satisfactory mechanical properties, which play a significant role in improving separator properties and cell performance. This study underlines that the porous structure-tuned cellulose nanofiber papers provide a promising new route for the fabrication of advanced separator membranes, which will also serve as a key component to boost the development of next-generation paper batteries.
URI
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DOI
http://dx.doi.org/10.1039/c2jm32415f
ISSN
0959-9428
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