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NANOSYSTEMS: PHYSICS, CHEMISTRY, MATHEMATICS, 2021, 12 (2), P. 182–187

Layer-by-layer synthesis of Zn-doped MnO2 nanocrystals as cathode materials for aqueous zinc-ion battery

A. A. Lobinsky – Saint Petersburg State University, Peterhof, 198504 Saint Petersburg, Russia; lobinsky.a@gmail.com
M.V. Kaneva – Saint Petersburg State University, Peterhof, 198504 Saint Petersburg, Russia

This work first described the new oxidation-reduction route for the synthesis of Zn-doped MnO2 nanocrystals via layer-by-layer method as cathode material for an aqueous zinc-ion battery. The obtained nanolayers were characterized by SEM, XRD, XPS and FTIR spectroscopy. The results show the synthesized nanolayers were formed from two-dimensional nanocrystals Zn0.3MnO2 the thickness of about 3–8 nm and the morphology of “nanosheets” with the birnessite-like crystal structure. Benefiting from the aqueous 2M ZnSO4 electrolyte and Zn0.3MnO2 nanocrystals-based cathode, the zinc-ion battery delivers a high specific capacity (216 mAh/g at 1 A/g) and excellent cycling stability (95% capacity retention after 1000 charge-discharge cycles). The obtained results demonstrate the manganese oxide-based aqueous zinc-ion battery is a promising technology for powering next-generation electronics.

Keywords: Manganese oxide, zinc, nanocrystals, layer-by-layer, electrode materials, zinc-ion battery.

PACS 81.07.Bc

DOI 10.17586/2220-8054-2021-12-2-182-187

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