ZnNixMnxCo2–2 xO4 Spinel as a High-Voltage and High-Capacity Cathode Material for Nonaqueous Zn-Ion Batteries

Chengsi Pan, Ruixian Zhang, Ralph G. Nuzzo, Andrew A. Gewirth

Research output: Contribution to journalArticle

Abstract

Nonaqueous Zn-ion batteries are regarded as one alternative for Li-ion batteries. Such batteries not only afford attractive attributes of cost, but also embody the advantages of the high-specific capacities of Zn anodes, as well as the wide potential window of nonaqueous electrolytes. To fully exploit these advantages, improved cathode materials are highly desired. In this manuscript, a new series of spinels, ZnNixMnxCo2–2 xO4, are reported as cathode materials for nonaqueous Zn-ion batteries. Full cells constructed using this new spinel (x = 1/2) as a cathode paired with a metal anode showed capacities over 200 cycles of 174 mAh g−1 and an open circuit potential of 2.05 V. The battery exhibits an energy density of 305 Wh kg−1, which is the highest energy density yet reported for a Zn-intercalation cathode. The data show that the Zn2+ ions reversibly intercalate into the spinel structure during the charge/discharge processes, a compositional transformation directly correlated with a multiply reversible conversion between Co4+/Co3+, Ni4+/Ni3+/Ni2+, and Mn4+/Mn3+ oxidation states within the lattice. The data suggest that Mn, Ni cosubstitution for Co in ZnCo2O4 is an efficient method to facilitate Zn-deintercalation and enhance discharge capacity, which may provide some guidelines for designing more attractive multivalent cathodes materials.

Original languageEnglish (US)
Article number1800589
JournalAdvanced Energy Materials
Volume8
Issue number22
DOIs
StatePublished - Aug 6 2018

Keywords

  • batteries
  • cathodes
  • energy storage
  • spinel
  • zinc

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

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