A safe and high-rate negative electrode for sodium-ion batteries: Hard carbon in NaFSA-C1C3pyrFSA ionic liquid at 363 K

JOURNAL OF POWER SOURCES

卷:246

Article

Fukunaga, Atsushi^1,2  Nohira, Toshiyuki¹  Hagiwara, Rika¹  Numata, Koma²  Itani, Eiko²  Sakai, Shoichiro²  Nitta, Koji²  Inazawa, Shinji² 

[1] Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Kyoto 6068501, Japan

[2] Sumitomo Elect Ind Ltd, Konohana Ku, Osaka 5540024, Japan

关键词: Hard carbon;    Sodium secondary battery;    Ionic liquid;    Bis(fluorosulfonyl)amide;    N-Methyl-N-propylpyrrolidinium;   

DOI  :  10.1016/j.jpowsour.2013.07.112

来源: Elsevier

【 摘 要 】

Charge-discharge properties of hard carbon (HC) for sodium secondary batteries using NaFSA-C(1)C(3)pyrFSA (FSA: bis(fluorosulfonyl)amide, C(1)C(3)pyr: N-methyl-N-propylpyrrolidinium) ionic liquids were investigated. A Na/NaFSA-C(1)C(3)FSA/HC cell showed reversible capacity of 260 mAh (g-HC)(-1) at a constant rate of 50 mA (g-HC)(-1) at 363 K, maintaining cell capacities of approximately 95.5% of the initial capacity after 50 cycles. Coulombic efficiency was higher than 99.5% except for the initial few cycles, reaching 99.9% after 40 cycles. The Na/NaFSA-C(1)C(3)pyrFSA/HC cell also exhibited a high rate capability of 211 mAh (g-HC)(-1) at a rate of 1000 mA (g-HC)(-1), which corresponds to a charge rate of approximately 4C. (C) 2013 Elsevier B.V. All rights reserved.

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