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

Xianfen Wang, Mao Tamaru, Masashi Okubo, Atsuo Yamada*

*この研究の対応する著者

研究成果: Article査読

157 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)15545-15551
ページ数7
ジャーナルJournal of Physical Chemistry C
117
30
DOI
出版ステータスPublished - 2013 8月 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • エネルギー(全般)
  • 物理化学および理論化学
  • 表面、皮膜および薄膜

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