Pseudocapacitance effect in Al-C batteries with expanded graphite positive electrode at different temperatures
Pseudocapacitance effect in Al-C batteries with expanded graphite positive electrode at different temperatures
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不同温度下膨胀石墨正极Al-C电池的赝电容效应
DOI：
10.1016/j.jpowsour.2020.228323
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发表时间：
2020-08
影响因子：
9.2
通讯作者：
Zhang Wenming
中科院分区：
文献类型：
--
作者：
Li Zhanyu;Li Jianling;Li Xiaoxiao;Zhang Wenming
在Al-C电池中，石墨和铝分别在室温离子液体alcl3 /1-乙基-3-甲基咪唑氯（[EMIm]Cl）中作为正极和负极。由于电化学储能是由电解液中的阴离子和阳离子来完成的，因此系统地分析了Al-C电池在不同温度下的电化学性能和赝电容特性。在1 mV s−1时，在20°C、40°C和60°C时，赝电容率分别为36.9%、19.8%和15.2%。此外，聚铝阴离子的扩散系数随温度的升高而提高。这一有趣的现象可归因于高温加速了电解液中聚铝阴离子的扩散和传递，充分发挥了电极材料的优势。这将增加放电容量，加速离子和电子的输运，并显示出更占优势的传统电池特性。但过高的温度会加速电解液对铝金属的腐蚀作用，因此膨胀石墨在40℃时在Al-C电池中表现出优异的循环性能。该工作对铝二次电池的发展具有指导作用。
In Al-C batteries, graphite and aluminum are used as positive electrode and negative electrode in room temperature ionic liquid AlCl3/1-ethyl-3-methylimidazolium chloride ([EMIm]Cl), respectively. Due to that the electrochemical energy storage is performed by the anions and cations in the electrolyte, the electrochemical properties and pseudocapacitance characteristics of Al-C batteries at different temperatures are systematically analyzed. At 1 mV s−1, the ratio of pseudocapacitance are 36.9%, 19.8% and 15.2% at 20 °C, 40 °C and 60 °C, respectively. In addition, the diffusion coefficient of polyaluminium anions improved with the increase of temperature. This interesting phenomenon can be attributed to the fact that high temperature accelerates the diffusion and transmission of polyaluminium anions in the electrolyte and takes full advantages of electrode materials. This will increase the discharge capacity, accelerate the transport of ions and electrons and show more dominant traditional battery characteristics. However, too high temperature may accelerate the corrosion effect of electrolyte to aluminum metal, so expanded graphite shows excellent cycling performance in Al-C batteries at 40 °C. This work plays a guiding role in the development of aluminum secondary batteries.
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影响因子：
16.6
作者：
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