Cathode Properties of Na 3 MnPO 4 CO 3 Prepared by the Mechanical Ball Milling Method for Na-Ion Batteries

Baowei Xie, Ryo Sakamoto, Ayuko Kitajou, Kosuke Nakamoto, Liwei Zhao, Shigeto Okada, Wataru Kobayashi, Masaki Okada and Toshiya Takahara
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Baowei Xie: Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
Ryo Sakamoto: Interdisciplinary Graduate School of Engineering Science, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
Ayuko Kitajou: Organization for Research Initiatives, Yamaguchi University, 2-16-1 Tokiwadai, Ube 755-8611, Japan
Kosuke Nakamoto: Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
Liwei Zhao: Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
Shigeto Okada: Institute of Materials Chemistry and Engineering, Kyushu University, 6-1, Kasuga Koen, Kasuga 816-8580, Japan
Wataru Kobayashi: Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-0014, Japan
Masaki Okada: Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-0014, Japan
Toshiya Takahara: Tosoh Corporation, 3-8-2, Shiba, Minato-Ku, Tokyo 105-0014, Japan

Energies, 2019, vol. 12, issue 23, 1-10

Abstract: A novel carbonophosphate, Na 3 MnPO 4 CO 3 , was synthesized as a cathode material using a mechanical ball milling method with starting materials of MnCO 3 and Na 3 PO 4 without washing or drying. Duo to the formation of nano-size particles and good dispersion of the obtained Na 3 MnPO 4 CO 3 , the initial discharge capacity in an organic electrolyte of 1 M NaPF 6 /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 Na 3 MnPO 4 CO 3 in an aqueous electrolyte of 17 m NaClO 4 . This is the first investigation of the electrochemical performance of Na 3 MnPO 4 CO 3 with aqueous electrolyte. Na 3 MnPO 4 CO 3 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 NaClO 4 .

Keywords: Na-ion battery; carbonophosphate; mechanical ball milling; aqueous electrolyte (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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