Metamorphosis of Seaweeds into Multitalented Materials for Energy Storage Applications

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, repor...

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Bibliographic Details
Published in:Advanced energy materials 2019-05, Vol.9 (19), p.n/a
Main Authors: Shin, Myoungsoo, Song, Woo‐Jin, Han, Jung‐Gu, Hwang, Chihyun, Lee, Sangyeop, Yoo, Seokkeun, Park, Sewon, Song, Hyun‐Kon, Yoo, Seungmin, Choi, Nam‐Soon, Park, Soojin
Format: Article
Language:English
Subjects:
Agar
Cathodes
Chelation
Electrochemical analysis
Electrode materials
Energy storage
high temperature stability
high‐energy density
Hydrofluoric acid
Ion currents
Lithium manganese oxides
Lithium-ion batteries
nonsolvent‐induced phase separation
Phase separation
Potential energy
seaweed
Seaweeds
Separators
Thermal stability
Transition metals
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Summary: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. A seaweed‐extracted multitalented biomaterial for lithium‐ion battery components including a separator membrane and binder is demonstrated as a promising material for the Mn‐based cathode materials with highly stable cycling performance (84%) even at high‐voltage operation (3.5–5.0 V) under high temperature (>55 °C) at a high charge/discharge rate (1 C/1 C).
ISSN:1614-6832
1614-6840
DOI:10.1002/aenm.201900570