Metal–organic framework for dendrite-free anodes in aqueous rechargeable zinc batteries

Eunji Kim, Inyoung Choi, Kwan Woo Nam

Research output: Contribution to journalArticlepeer-review

Abstract

Aqueous rechargeable zinc batteries (ZBs) have many advantages, such as eco-friendliness, low cost, and high-rate performance. However, the Zn dendrite growth on the Zn metal anode of ZBs causes a short-circuit problem between the cathode and anode of the battery, resulting in the degradation of the cell performance. In this study, we employed a Zr-based metal–organic framework (Zr-MOF; UiO-66(Zr)-(COOH)2) with a poly(vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) copolymer binder as a composite protective layer (CPL) to inhibit dendrite formation. The highly stable and porous metal–organic framework (MOF) in the CPL acted as a sieve allowing Znions to be uniformly deposited on the Zn anode. It effectively controlled the Zn dendrite formation during cycling. In addition, compared to a polyvinylidene fluoride (PVDF) homopolymer binder, the PVDF-HFP copolymer binder has a higher ionic conductivity and binding affinity with the Zr-MOF in the CPL, thus reducing the overpotential of the Zn symmetric cell and further improving its cyclability. As a result, the Zn symmetric cell, coated with the CPL composed of Zr-MOF and PVDF-HFP copolymer binder, exhibited stable operation for 2400 cycles at a high current density of 10 mA/cm2 without a short circuit. This result suggests that the combination of MOF materials and copolymer binders to design a CPL is efficient in suppressing Zn dendrites.

Original languageEnglish
Article number140648
JournalElectrochimica Acta
Volume425
DOIs
StatePublished - 1 Sep 2022

Keywords

  • Aqueous rechargeable zinc batteries
  • Composite protective layer (CPL)
  • Metal-organic framework (MOF)
  • PVDF-HFP copolymer
  • Zinc dendrites

Fingerprint

Dive into the research topics of 'Metal–organic framework for dendrite-free anodes in aqueous rechargeable zinc batteries'. Together they form a unique fingerprint.

Cite this