A new concept hybrid electrochemical surpercapacitor: Carbon/LiMn2O4 aqueous system
A new concept hybrid electrochemical surpercapacitor: Carbon/LiMn2O4 aqueous system
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DOI：
10.1016/j.elecom.2005.08.017
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发表时间：
2005-11
影响因子：
5.4
通讯作者：
Yonggang Wang;Yongyao Xia
中科院分区：
文献类型：
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作者：
Yonggang Wang;Yongyao Xia
提出了一种新概念的混合电化学超级电容器技术，在温和的Li 2SO 4水溶液电解液中，以活性炭为负极，锂离子插层化合物LiMn 2 O 4为正极。充/放电过程与两个电极之间的锂离子转移有关。该混合电池表现出从0.8到1.8V的倾斜电压分布，并提供了估计的比能量约为。35 Wh/kg，基于活性电极材料的总重量。该电池表现出优异的循环性能，在10 C充电/放电速率下超过20，000次循环的容量损失小于5%。新型混合型水性超级电容器技术克服了传统混合型超级电容器在充电过程中电解液耗尽的缺点，也解决了锂离子电池电极材料在水性电解液中循环寿命差的主要问题。
We present a new concept hybrid electrochemical surpercapacitor technology in which the activated carbon was used as a negative electrode and a lithium-ion intercalated compound LiMn2O4as a positive electrode in a mild Li2SO4aqueous electrolyte. The charge/discharge process is associated with the transfer of Li-ion between two electrodes. The hybrid cell exhibits a sloping voltage profile from 0.8 to 1.8V, and delivers an estimated specific energy of ca. 35Wh/kg based on the total weight of the active electrode materials. The cell exhibits excellent cycling performance with less than 5% capacity loss over 20,000 cycles at 10C charge/discharge rate. The new state-of-the-art hybrid aqueous supercapacitor technology overcomes the drawbacks of electrolyte depletion during charge process of conventional hybrid supercapcitors, and also solved the major problems of poor cycling life of lithium-ion battery electrode materials in aqueous electrolyte.