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Electrochemical Performances of MCMB/(AC+LiFePO4) Lithium-Ion Capacitors  
Electrochemical Performances of MCMB/(AC+LiFePO4) Lithium-Ion Capacitors
資料類型: PDF文件
關鍵詞: lithium-ion  capacitors  mesocarbon  microbeads  activated  carbon  LiFePO4  
Li+  pre-doping  
資料大?。?/td> k
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簡介:
Lithium-ion capacitors (LICs) were fabricated using mesocarbon microbeads (MCMB) as a negative electrode and a mixture of activated carbon (AC) and LiFePO4 as 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% LiFePO4 was found to have the best electrochemical performance with a specific energy density of 69.02 W h kg?1 remaining 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 LiFePO4 to 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.
上傳人: shizhiqiang
上傳時間: 2014-05-22 10:18:15
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