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Song, Hyun-Kon
eclat: ElectroChemistry Lab of Advanced Technology
Research Interests
  • Electrochemical analysis, electroactive materials, electrochemistry-based energy devices

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Metamorphosis of Seaweeds into Multitalented Materials for Energy Storage Applications

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Title
Metamorphosis of Seaweeds into Multitalented Materials for Energy Storage Applications
Author
Shin, MyoungsooSong, Woo-JinHan, Jung-GuHwang, ChihyunLee, SangyeopYoo, SeokkeunPark, SewonSong, Hyun-KonYoo, SeungminChoi, Nam-SoonPark, Soojin
Issue Date
2019-05
Publisher
Wiley-VCH Verlag
Citation
ADVANCED ENERGY MATERIALS, v.9, no.19, pp.1900570
Abstract
Transition metal ion dissolution due to hydrofluoric acid attack is a long‐standing issue in the Mn‐based spinel cathode materials of lithium‐ion batteries (LIBs). Numerous strategies have been proposed to address this issue, but only a fragmentary solution has been established. In this study, reported is a seaweed‐extracted multitalented material, namely, agar, for high‐performance LIBs comprising Mn‐based cathode materials at a practical loading density (23.1 mg cm−2 for LiMn2O4 and 10.9 mg cm−2 for LiNi0.5Mn1.5O4, respectively). As a surface modifier, 3‐glycidoxypropyl trimethoxysilane (GPTMS) is employed to enable the agar to have different phase separation behaviors during the nonsolvent‐induced phase separation process, thus eventually leading to the fabrication of an outstanding separator membrane that features a well‐defined porous structure, superior mechanical robustness, high ionic conductivity, and good thermal stability. The GPTMS‐modified agar separator membrane coupled with a pure agar binder to the LiNi0.5Mn1.5O4/graphite full cell leads to exceptional improvement in electrochemical performance outperforming binders and separator membrane in current commercial products even at 55 °C; this improvement is due to beneficial features such as Mn2+ chelation and PF5 stabilizing capabilities. This study is believed to provide insights into the potential energy applications of natural seaweeds.
URI
https://scholarworks.unist.ac.kr/handle/201301/26476
URL
https://onlinelibrary.wiley.com/doi/full/10.1002/aenm.201900570
DOI
10.1002/aenm.201900570
ISSN
1614-6832
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