Hybrid separator containing reactive, nanostructured alumina promoting in-situ gel electrolyte formation for lithium-ion batteries with good cycling stability and enhanced safety
- Authors
- Ahn, Jun Hwan; You, Tae-Sun; Lee, Sang-Min; Esken, Daniel; Dehe, Daniel; Huang, Yuan-Chang; Kim, Dong-Won
- Issue Date
- Oct-2020
- Publisher
- ELSEVIER
- Keywords
- Reactive alumina; Gel electrolyte; Lithium-ion cell; Enhanced safety; Cycling performance
- Citation
- JOURNAL OF POWER SOURCES, v.472, pp.1 - 9
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POWER SOURCES
- Volume
- 472
- Start Page
- 1
- End Page
- 9
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/32739
- DOI
- 10.1016/j.jpowsour.2020.228519
- ISSN
- 0378-7753
- Abstract
- The thermal instability of conventional polyolefin separators and the high flammability of organic electrolytes are the primary safety-related concerns of high-energy-density lithium-ion batteries. To address these issues, reactive Al2O3 nanostructured materials are coated onto a polyethylene (PE) separator to promote the formation of gel electrolyte and enhance the thermal stability of the separator. The Al2O3 nanostructured materials are surface-treated by 3-methacryloxypropyl trimethoxysilane to induce radical polymerization with tetra(ethylene glycol) diacrylate (TEGDA) in liquid electrolyte. The three-dimensional network formed by cross-linking reactive alumina nanostructured materials and TEGDA reduces the electrolyte leakage from the cell and enhances the interfacial adhesion between separator and electrodes. Thermal shrinkage of the reactive alumina-coated separator is also significantly reduced at 140 degrees C, providing enhanced thermal stability. In addition to improved thermal safety, lithium-ion cells employing a reactive alumina-coated PE separator exhibit stable cycling at both ambient and high temperatures.
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