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Electrochemistry_Y. Shimbori et al._Supporting infomation.docx (2.23 MB)

Application of 3DOM PI Separator to Li Metal Battery with Highly Concentrated Ionic Liquid Electrolyte (Supporting Information)

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posted on 2023-12-14, 06:34 authored by Yuma SHIMBORI, Kei NISHIKAWA, Koichi KAJIHARA, Kiyoshi KANAMURA
Highly concentrated ionic liquid electrolytes (ILEs) have garnered considerable attention because of the safety of Li metal batteries. However, the use of highly concentrated electrolytes including ILEs is limited by the low affinity to separators. The separator directly contacts the surface of the Li metal anode, which significantly affects the morphology of deposited Li metal. In this study, a three-dimensionally ordered macroporous polyimide (3DOM PI) was proposed as a high-affinity separator for highly concentrated ILE ([lithium bis(fluorosulfonyl)imide]1[N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide]1). The 3DOM PI separator is made of polyimide and has a high porosity with a 3D-ordered uniform pore structure. These properties resulted in a higher affinity for highly concentrated ILE and higher ionic conductivity compared with that of conventional separators, making it possible to improve the reversibility of Li deposition/dissolution and the rate capability of the full cells. Moreover, the 3DOM PI separator improved the uniform Li deposition/dissolution and enabled the non-dendritic deposition of Li metal. The 3DOM PI with ILE provided more stable Li metal deposition/dissolution (charge/discharge reaction).

Funding

Next generation battery team

Japan Science and Technology Agency

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Advanced storage battery research and development base

Japan Science and Technology Agency

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Development of nonflammable lithium metal battery using three-dimensional ordered porous structure polyimide separator

Japan Society for the Promotion of Science

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Corresponding author email address

kanamura-kiyoshi@tmu.ac.jp

Copyright

© 2023 The Author(s).

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