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Cathode Properties of Na3MnPO4CO3 Prepared by the Mechanical Ball Milling Method for Na-Ion Batteries

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Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
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Organization for Research Initiatives, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
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Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
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Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-0014, Japan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(23), 4534; https://doi.org/10.3390/en12234534
Received: 20 October 2019 / Revised: 16 November 2019 / Accepted: 25 November 2019 / Published: 28 November 2019
(This article belongs to the Section Advanced Energy Materials)
A novel carbonophosphate, Na3MnPO4CO3, was synthesized as a cathode material using a mechanical ball milling method with starting materials of MnCO3 and Na3PO4 without washing or drying. Duo to the formation of nano-size particles and good dispersion of the obtained Na3MnPO4CO3, the initial discharge capacity in an organic electrolyte of 1 M NaPF6/ethylene carbonate (EC): dimethyl carbonate (DMC) (1:1 v/v) was 135 mAh∙g−1 and 116 mAh∙g−1 at 1/30 C and 1/10 C, respectively. We also investigated the cathode properties of Na3MnPO4CO3 in an aqueous electrolyte of 17 m NaClO4. This is the first investigation of the electrochemical performance of Na3MnPO4CO3 with aqueous electrolyte. Na3MnPO4CO3 achieved a discharge capacity as large as 134 mAh g−1 even at a high current density of 2 mA cm−2 (0.5 C), because of the high ionic conductivity of the aqueous electrolyte of 17 m NaClO4. View Full-Text
Keywords: Na-ion battery; carbonophosphate; mechanical ball milling; aqueous electrolyte Na-ion battery; carbonophosphate; mechanical ball milling; aqueous electrolyte
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Xie, B.; Sakamoto, R.; Kitajou, A.; Nakamoto, K.; Zhao, L.; Okada, S.; Kobayashi, W.; Okada, M.; Takahara, T. Cathode Properties of Na3MnPO4CO3 Prepared by the Mechanical Ball Milling Method for Na-Ion Batteries. Energies 2019, 12, 4534.

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