Development of MnO<sub>2</sub> Based Cathodes for Alkaline Batteries via Combinatorial Approach

Daricioglu N. O., Akbas Y., ÖZTÜRK T.

JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol.169, no.12, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 169 Issue: 12
  • Publication Date: 2022
  • Doi Number: 10.1149/1945-7111/acad37
  • Journal Name: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Analytical Abstracts, Applied Science & Technology Source, Chemical Abstracts Core, Chimica, Compendex, Computer & Applied Sciences, INSPEC
  • Middle East Technical University Affiliated: Yes

Abstract

A combinatorial study is carried out to develop new cathode compositions in alkaline Zn-MnO2 secondary batteries. MnO2 is modified with ternary additions using Bi2O3, Na0.7MnO2, and NiO. A library of thick film cathodes over a wide compositional range is synthesized via sputter deposition. Thick film cathodes are investigated both electrochemically and structurally. Structural studies show that thick film cathodes are largely amorphous in the as-deposited state but upon charge-discharge cycling, are crystallized into delta-MnO2, i.e. layered polymorph of MnO2. The thick film cathodes are evaluated with cyclic voltammetry and charge-discharge cycling. Two compositional regions are noted as significant in terms of useful cathodes for rechargeable batteries. Compositions rich in NiO yield quite a reliable cell performance which might be considered as cathode material for Zn-NiO batteries. More importantly, there was also a region where Mn and Na had similar proportions doped by Bi and Ni, e.g. Bi0.08Na0.39Ni0.09Mn0.44Ox, which might be made the basis for improved cathode for Zn-MnO2 batteries.