Electrochemical Na Insertion and Solid Electrolyte Interphase for Hard-Carbon Electrodes and Application to Na-Ion Batteries

Authors

  • Shinichi Komaba,

    Corresponding author
    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
    • Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Wataru Murata,

    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Toru Ishikawa,

    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Naoaki Yabuuchi,

    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Tomoaki Ozeki,

    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Tetsuri Nakayama,

    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Atsushi Ogata,

    1. Department of Applied Chemistry, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku, Tokyo 162-8601, Japan, Fax: +81 3 5228 8749
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  • Kazuma Gotoh,

    Corresponding author
    1. Department of Chemistry, Okayama University, 3-1-1 Tsushima-naka, Kita, Okayama 700-8530, Japan, Fax: +81 86 251 7776S
    • Department of Chemistry, Okayama University, 3-1-1 Tsushima-naka, Kita, Okayama 700-8530, Japan, Fax: +81 86 251 7776S.
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  • Kazuya Fujiwara

    1. Department of Chemistry, Okayama University, 3-1-1 Tsushima-naka, Kita, Okayama 700-8530, Japan, Fax: +81 86 251 7776S
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Abstract

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/NaNi0.5Mn0.5O2 cell, demonstrates steady cycling performance as next generation secondary batteries and an alternative to Li-ion batteries.

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