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

被引:70
作者
Fukunaga, Atsushi [1 ,2 ]
Nohira, Toshiyuki [1 ]
Hagiwara, Rika [1 ]
Numata, Koma [2 ]
Itani, Eiko [2 ]
Sakai, Shoichiro [2 ]
Nitta, Koji [2 ]
Inazawa, Shinji [2 ]
机构
[1] Kyoto Univ, Grad Sch Energy Sci, Sakyo Ku, Kyoto 6068501, Japan
[2] Sumitomo Elect Ind Ltd, Konohana Ku, Osaka 5540024, Japan
基金
日本科学技术振兴机构;
关键词
Hard carbon; Sodium secondary battery; Ionic liquid; Bis(fluorosulfonyl)amide; N-Methyl-N-propylpyrrolidinium; SECONDARY BATTERY; NAFSA-KFSA; POSITIVE ELECTRODE; CRYSTAL-STRUCTURES; PERFORMANCE; NACRO2; SYSTEM;
D O I
10.1016/j.jpowsour.2013.07.112
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
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.
引用
收藏
页码:387 / 391
页数:5
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