Water-Repellent Ionic Liquid Skinny Gels Customized for Aqueous Zn-Ion Battery Anodes

Donggue Lee, Hong I. Kim, Won Yeong Kim, Seok Kyu Cho, Kyungeun Baek, Kihun Jeong, David B. Ahn, Sodam Park, Seok Ju Kang, Sang Young Lee

Research output: Contribution to journalArticlepeer-review

37 Citations (Scopus)


Despite the enormous potential of aqueous zinc (Zn)-ion batteries as a cost-competitive and safer power source, their practical applications have been plagued by the chemical/electrochemical instability of Zn anodes with aqueous electrolytes. Here, ionic liquid (IL) skinny gels are reported as a new class of water-repellent ion-conducting protective layers customized for Zn anodes. The IL skinny gel (thickness ≈500 nm), consisting of hydrophobic IL solvent, Zn salts, and thiol-ene polymer compliant skeleton, prevents the access of water molecules to Zn anodes while allowing Zn2+ conduction for redox reactions. The IL-gel-skinned Zn anode enables sustainable Zn plating/stripping cyclability under 90% depth of discharge (DODZn) without suffering from water-triggered interfacial parasitic reactions. Driven by these advantageous effects, a Zn-ion full cell (IL-gel-skinned Zn-anode||aqueous-electrolyte-containing MnO2 cathode) exhibits high charge/discharge cycling performance (capacity retention ≈95.7% after 600 cycles) that lies beyond those achievable with conventional aqueous Zn-ion battery technologies.

Original languageEnglish
Article number2103850
JournalAdvanced Functional Materials
Issue number36
Publication statusPublished - 2021 Sept 2

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program (2021R1A2B5B03001615, 2021M3D1A2043788, 2018M3D1A1058744, and 2016R1A5A1009926) through the National Research Foundation of Korea (NRF) funded by the Korean Government (MSIT) and Yonsei University Research Fund of 2020‐22‐0536.

Publisher Copyright:
© 2021 Wiley-VCH GmbH

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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