4.5 Article

A sulfonated polyvinyl alcohol ionomer membrane favoring smooth electrodeposition of zinc for aqueous rechargeable zinc metal batteries

Journal

SUSTAINABLE ENERGY & FUELS
Volume 5, Issue 21, Pages 5557-5564

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/d1se00865j

Keywords

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Funding

  1. University Grants Commission (UGC), New Delhi, India
  2. CSIR, New Delhi, India
  3. Department of Science and Technology (DST), India [GAP328726, CRG/2019/000277]

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The study demonstrates the potential of an ionomer electrolyte membrane made by the physical cross-linking of PVS and PVA to inhibit dendrite and HSAZ-induced failure in AZMBs, enhancing battery performance and cycle life.
One of the failure mechanisms of aqueous rechargeable zinc metal batteries (AZMBs) involves high surface area zinc (HSAZ)/dendrite-like deposits over the Zn-metal anode during long-term cycling. Negatively charged (anionic) polymeric ionomer electrolyte membranes and separators are known for suppressing the dendrite-/HSAZ-induced failure of AZMBs. However, the preparation of cost-effective and non-fluorinated ionomers from cheap and environmentally friendly polymers is essential to leverage the feasibility of AZMBs. The current work demonstrates the potential of an ionomer electrolyte membrane (P-AS-C-Zn) made by the crystallization-induced physical cross-linking of sulfonated poly (vinyl alcohol) (PVS) and poly (vinyl alcohol) (PVA) as a dendrite-/HSAZ-inhibiting separator for AZMBs. The P-AS-C-Zn membranes exhibited excellent Zn plating/stripping behavior with a stable voltage vs. time profile beyond 1100 h, compared to their neutral PVA-C-Zn counterpart without any ionomer character (cell failure at close to 280 h). Applying the optimized P-AS-C-Zn membrane in a MnO2||Zn full cell helps retain about 50% of the initial capacity close to 600 cycles in the absence of extra manganese salt in the electrolyte, which is indeed promising.

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