Study of New Active Materials for Rechargeable Sodium-Ion Batteries

Abstract:

Na₄Co₃(PO₄)₂P₂O₇ is the unique crystal structure with multiple sodium-ion pathways in the structure. The electrochemical properties of Na₄Co₃(PO₄)₂P₂O₇ as a positive electrode for sodium-ion batteries were investigated. Na₄Co₃(PO₄)₂P₂O₇ had the multi redox couples in the highest potential region between 4.1 V and 4.7 V among ever reported sodium active materials and could deliver the reversible capacity of ca. 95 mAhg^-1, corresponding to ca. 2.2 Na⁺. Na₄Co₃(PO₄)₂P₂O₇ also exhibited the high rate capabilities and had a small polarization in the charge - discharge profile even at the high current densities, resulting in high energy efficiency of the battery. These performances indicate Na₄Co₃(PO₄)₂P₂O₇ can be one of the good candidates for a positive electrode material of sodium-ion batteries.

• Periodical: Advances in Science and Technology (Volume 93)
• Pages: 137-145
• DOI: https://doi.org/10.4028/www.scientific.net/AST.93.137
• Online since: October 2014
• Authors: Shinji Nakanishi, Masafumi Nose*, Hideki Nakayama, Hideki Iba
• Keywords: High Potential, High Rate Capability, Na₄Co₃(PO₄)₂P₂O₇, Sodium-Ion Battery

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