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Lithium supercapacitors with environmentally-friend water-processable solid-state hybrid electrolytes of zinc oxide/polymer/lithium hydroxide

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  • Murukadas, Deepu
  • Cho, Yeonhwa
  • Lee, Woongki
  • Lee, Sooyong
  • Kim, Hwajeong
  • Kim, Youngkyoo

Abstract

Environment-friendly and safe solid-state electrolytes are of utmost importance for energy storage devices, but no study has been reported on water-processable hybrid electrolytes that take advantage of both organic and inorganic components. Here, for the first time, we demonstrate that novel water-processable hybrid films, consisting of zinc oxide (ZnO) nanoparticle, lithium hydroxide (LiOH), and branched-poly(ethylene imine) (bPEI), act as efficient solid-state electrolytes for lithium supercapacitors. The ZnO:bPEI:LiOH (ZPL) hybrid solutions were prepared using water by varying ZnO molar ratios up to 60 mol% to the repeating unit of bPEI. The enhanced ionic conductivity (∼1.36 mS/cm), which is higher than that of bPEI:LiOH electrolytes, was achieved at ZnO = 30 mol%. The best ZPL supercapacitors, exhibiting high performances of peak potential (2.0 V) and energy density (3.38 mWh/kg) upon charging at 0.4 mA/g only, could be stably operated over 1000 charging/discharging cycles. Series connection of multiple ZPL supercapacitors delivered increased output potentials (∼4.5 V from three devices in series) with reproducible charging/discharging performances. The experimental result supports that the present ZPL hybrid electrolyte technology paves the way for eco-friendly processes of next-generation solid-state electrolytes that can be a key in safe energy storage devices for applications to electrical vehicles etc.

Suggested Citation

  • Murukadas, Deepu & Cho, Yeonhwa & Lee, Woongki & Lee, Sooyong & Kim, Hwajeong & Kim, Youngkyoo, 2024. "Lithium supercapacitors with environmentally-friend water-processable solid-state hybrid electrolytes of zinc oxide/polymer/lithium hydroxide," Energy, Elsevier, vol. 290(C).
    • Handle: RePEc:eee:energy:v:290:y:2024:i:c:s0360544223033789
    DOI: 10.1016/j.energy.2023.129984
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    References listed on IDEAS

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