TY - JOUR
T1 - Metal–organic framework for dendrite-free anodes in aqueous rechargeable zinc batteries
AU - Kim, Eunji
AU - Choi, Inyoung
AU - Nam, Kwan Woo
N1 - Funding Information:
K.W.N. acknowledges support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (ABML) (NRF- 2022R1C1C1007133 ). This work was also supported by the Ewha Womans University Research Grant of 2021. The Korea Basic Science Institute is also acknowledged for the SEM measurement.
Funding Information:
K.W.N. acknowledges support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (ABML) (NRF-2022R1C1C1007133). This work was also supported by the Ewha Womans University Research Grant of 2021. The Korea Basic Science Institute is also acknowledged for the SEM measurement.
Publisher Copyright:
© 2022
PY - 2022/9/1
Y1 - 2022/9/1
N2 - 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.
AB - 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.
KW - Aqueous rechargeable zinc batteries
KW - Composite protective layer (CPL)
KW - Metal-organic framework (MOF)
KW - PVDF-HFP copolymer
KW - Zinc dendrites
UR - http://www.scopus.com/inward/record.url?scp=85131454114&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2022.140648
DO - 10.1016/j.electacta.2022.140648
M3 - Article
AN - SCOPUS:85131454114
SN - 0013-4686
VL - 425
JO - Electrochimica Acta
JF - Electrochimica Acta
M1 - 140648
ER -