Effects of the LiFePO4 content and the preparation method on the properties of (LiFePO4+AC)/Li4Ti5O12 hybrid battery capacitors
Effects of the LiFePO4 content and the preparation method on the properties of (LiFePO4+AC)/Li4Ti5O12 hybrid battery capacitors
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DOI：
10.2298/jsc091228105h
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发表时间：
2010-01-01
影响因子：
1
通讯作者：
Deng, Zheng Hua
中科院分区：
文献类型：
--
作者：
Hu, Xue Bu;Lin, Zi Ji;Deng, Zheng Hua
采用原位法和直接混合技术合成了两种含有LiFePO4和活性炭（AC）的复合正极材料，分别简称为LAC和DMLAC。然后组装混合电池电容器 LAC/Li4Ti5O12 和 DMLAC/Li4Ti5O12。研究了LiFePO4含量和制备方法对混合电池电容器循环伏安、充放电倍率和循环性能的影响。结果表明，当复合正极材料中LiFePO4的含量在11.8至28.5 wt范围内时，混合电池电容器的整体电化学性能最佳。 %，而制备方法对复合正极和混合电池电容器的电化学性能几乎没有影响。此外，混合电池电容器装置在高倍率下具有良好的循环寿命性能。 1000次循环后，DMLAC/Li4Ti5O12混合电池电容器装置在4C下的容量损失不超过4.8%。此外，在8C下循环2000次后，容量损失不超过9.6%。
Two composite cathode materials containing LiFePO4 and activated carbon (AC) were synthesized by an in-situ method and a direct mixing technique, which are abbreviated as LAC and DMLAC, respectively. Hybrid battery capacitors LAC/Li4Ti5O12 and DMLAC/Li4Ti5O12 were then assembled. The effects of the content of LiFePO4 and the preparation method on the cyclic voltammograms, the rate of charge discharge and the cycle performance of the hybrid battery capacitors were investigated. The results showed the overall electrochemical performance of the hybrid battery capacitors was the best when the content of LiFePO4 in the composite cathode materials was in the range from 11.8 to 28.5 wt. %, while the preparation method had almost no impact on the electrochemical performance of the composite cathodes and hybrid battery-capacitors. Moreover, the hybrid battery capacitor devices had a good cycle life performance at high rates. After 1000 cycles, the capacity loss of the DMLAC/Li4Ti5O12 hybrid battery capacitor device at 4C was no more than 4.8 %. Moreover, the capacity loss would be no more than 9.6 % after 2000 cycles at 8C.