Electrode properties of P2-Na2/3MnyCo 1- yO2 as cathode materials for sodium-ion batteries

Xianfen Wang, Mao Tamaru, Masashi Okubo, Atsuo Yamada

Research output: Contribution to journalArticlepeer-review

140 Citations (Scopus)

Abstract

The development of high-performance Na-ion intercalation electrodes has been required recently because Na-ion batteries hold much promise for inexpensive and efficient energy storage, which can be deployed in a power grid. For both optimization and better understanding of the electrode materials, it is indispensable to clarify the relationship between the electronic state and electrochemical properties systematically. In this work, we studied the electrochemical properties of P2-Na2/3MnyCo 1-yO2 in detail. A series of the P2 phases was successfully synthesized by the conventional solid-state reaction. The solid solution P2 compounds showed that the redox potential of Co4+/Co 3+ and Mn4+/Mn3+ shifts systematically by the transition-metal substitution. The charge-discharge cycle tests revealed that with increasing y the initial specific capacity increases while the cycle stability degrades. The origin for the cycle degradation was analyzed by the electrochemical impedance spectroscopy, which evidenced that the substitution of Co for Mn accelerates the formation of the passivating layer at the electrode surface.

Original languageEnglish
Pages (from-to)15545-15551
Number of pages7
JournalJournal of Physical Chemistry C
Volume117
Issue number30
DOIs
Publication statusPublished - 2013 Aug 1
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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