Electrochemical performance of MCMB/(AC+LiFePO4) lithium-ion capacitors
Electrochemical performance of MCMB/(AC+LiFePO4) lithium-ion capacitors
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MCMB/(AC LiFePO4)锂离子电容器的电化学性能
DOI：
10.1007/s11434-012-5456-9
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发表时间：
2013-02
影响因子：
--
通讯作者：
wang chengyang
中科院分区：
文献类型：
--
作者：
LiNa Ping;J iaMing Zheng;ZhiQiang Shi;Qi jie;wang chengyang
采用中间相碳微珠（MCMB）作为负极，活性炭（AC）和LiFePO4的混合物作为正极（简称LAC）制备了锂离子电容器（LIC）。通过 X 射线衍射 (XRD) 和场发射扫描电子显微镜 (FESEM) 对 LAC 样品的相结构和形貌进行了表征。使用循环伏安法、充放电速率测量和循环性能测试研究了LIC的电化学性能。发现含有 30 wt% LiFePO4 的 LIC 具有最佳电化学性能，在 4 C 倍率下经过 100 次循环后比能量密度仍为 69.02 W h kg−1。与纯交流正极系统相比，LICs的实际容量与理论计算容量之比从42.22%提高到56.59%。事实证明，在交流电极中添加LiFePO4不仅增加了正极的容量，而且通过Li+预掺杂改善了整个LICs的电化学性能。
Lithium-ion capacitors (LICs) were fabricated using mesocarbon microbeads (MCMB) as a negative electrode and a mixture of activated carbon (AC) and LiFePO4as a positive electrode (abbreviated as LAC). The phase structure and morphology of LAC samples were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). The electrochemical performance of the LICs was studied using cyclic voltammetry, charge-discharge rate measurements, and cycle performance testing. A LIC with 30 wt% LiFePO4was found to have the best electrochemical performance with a specific energy density of 69.02 W h kg−1remaining at 4 C rate after 100 cycles. Compared with an AC-only positive electrode system, the ratio of practical capacity to theoretical calculated capacity of the LICs was enhanced from 42.22% to 56.59%. It was proved that adding LiFePO4to AC electrodes not only increased the capacity of the positive electrode, but also improved the electrochemical performances of the whole LICs via Li+pre-doping.
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影响因子：
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通讯作者：
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