Comparative study of Li[Ni1/3Co1/3Mn1/3]O2 cathode material synthesized via different synthetic routes for asymmetric electrochemical capacitor applications

被引:30
作者
Yoon, J. -H. [1 ]
Bang, H. J. [1 ]
Prakash, Jai [2 ]
Sun, Y. -K. [1 ]
机构
[1] Hanyang Univ, Dept Chem Engn, Ctr Informat & Commun Mat, Seoul 133791, South Korea
[2] IIT, Dept Environm Chem & Engn, Ctr Electrochem Sci & Engn, Chicago, IL 60616 USA
关键词
asymmetric electrochemical capacitor; lithium transition metal oxide; pore size distribution; leakage current; voltage maintenance;
D O I
10.1016/j.matchemphys.2008.01.032
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Layered Li[Ni1/3Co1/3Mn1/3]O-2 cathode materials were synthesized by different synthesis routes using carbonate and hydroxide co-precipitation methods. Physical properties of the prepared Li[Ni1/3Co1/3Mn1/3]O-2 varied depending on the synthesis method employed. These materials were applied as a positive electrode to an asymmetric electrochemical capacitor with activated carbon as the negative electrode and the electrochemical properties of the capacitor were studied. Li[Ni1/3Co1/3Mn1/3]O-2 prepared by the carbonate co-precipitation exhibited higher capacitance and better rate capability with stable cycling retention over 500 cycles than Li[Ni1/3Co1/3Mn1/3]O-2 prepared by the hydroxide co-precipitation. The asymmetric electrochemical capacitor (AEC) cell (AC/Li[Ni1/3Co1/3Mn1/3]O-2) had a voltage slope from 0.2 to 2.2 V and delivered a capacity of 60 F g(-1) with a capacity retention of 88.4% during 500 cycles based on the overall active materials weight. The leakage current was largely decreased for the asymmetric electrochemical capacitor and the maintained voltage was 84.4% during 3 days. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:222 / 227
页数:6
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