Electrochemical Na insertion and solid electrolyte interphase for hard-carbon electrodes and application to Na-ion batteries

Shinichi Komaba, Wataru Murata, Toru Ishikawa, Naoaki Yabuuchi, Tomoaki Ozeki, Tetsuri Nakayama, Atsushi Ogata, Kazuma Gotoh, Kazuya Fujiwara

Research output: Contribution to journalArticlepeer-review

1625 Citations (Scopus)


Recently, lithium-ion batteries have been attracting more interest for use in automotive applications. Lithium resources are confirmed to be unevenly distributed in South America, and the cost of the lithium raw materials has roughly doubled from the first practical application in 1991 to the present and is increasing due to global demand for lithium-ion accumulators. Since the electrochemical equivalent and standard potential of sodium are the most advantageous after lithium, sodium based energy storage is of great interest to realize lithium-free high energy and high voltage batteries. However, to the best of our knowledge, there have been no successful reports on electrochemical sodium insertion materials for battery applications; the major challenge is the negative electrode and its passivation. In this study, we achieve high capacity and excellent reversibility sodium-insertion performance of hard-carbon and layered NaNi0.5Mn0.5O2 electrodes in propylene carbonate electrolyte solutions. The structural change and passivation for hard-carbon are investigated to study the reversible sodium insertion. The 3-volt secondary Na-ion battery possessing environmental and cost friendliness, Na+-shuttlecock hard-carbon/NaNi0.5Mn0.5O 2 cell, demonstrates steady cycling performance as next generation secondary batteries and an alternative to Li-ion batteries. Based upon high capacity and reversibility Na insertion of hard-carbon and layered Na xNi0.5Mn0.5O2 electrodes, the novel Na-ion battery of hard-carbon/NaNi0.5Mn0.5O2 is fabricated and electrochemically tested in organic electrolyte solutions. The 3-volt Na-ion battery with environmentally and cost friendly materials demonstrates steady cycling performance and is expected to be an alternative to secondary Li-ion batteries.

Original languageEnglish
Pages (from-to)3859-3867
Number of pages9
JournalAdvanced Functional Materials
Issue number20
Publication statusPublished - Oct 21 2011


  • Na-ion battery
  • electrochemistry
  • hard-carbon
  • insertion
  • sodium

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics


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