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本文使用水热法制备纳米铁酸钴CoFe2O4材料,将其在不同温度(350℃、450℃、550℃、650℃、750℃)下焙烧,使用扫描电镜(SEM)、X射线衍射仪(XRD)、傅里叶红外光谱仪(FT-IR)与氮气吸附仪(BET)对CoFe2O4结构进行表征;利用恒电流充放电法对不同温度下焙烧的CoFe2O4作为锂空气电池氧气电极催化剂的性能进行检测。结果表明,水热法制备的CoFe2O4属于尖晶石型结构。当电压范围为2.3V4.5V,电流密度为0.02mA·cm-2,650℃焙烧的CoFe2O4催化剂与纯科琴碳混合,作为锂空气电池氧气电极,其表现最佳。首次放电容量为2943mAh/g(电极),过电位为0.95V。与纯科琴碳相比,首次放电容量提高了约6.7倍,过电位降低了0.37V。
Abstract：In this work,nano-sized CoFe2O4 was fabricated via a simple hydrothermal process and calcined at various temperatures,such as 350℃,450℃,550℃,650℃,750℃.The structure of asprepared CoFe2O4 was characterized by the Scan Electron Microscope(SEM),X-ray Diffraction(XRD),Fourier Transform Infrared Spectroscopy(FT-IR)and nitrogen adsorption method(BET).The performance of CoFe2O4 nano-materials as the catalyst in the lithium air batteries were investigated with the method of galvanostatic charge-discharge test.It exhibited that the structure of CoFe2O4 was the spinel type.The nano-sized CoFe2O4 samples were empolyed as the catalyst of the anode material,Ketjen carbon in the lithium air batteries.The electrochemical proformances of the lithium air batteries were anylysed in the voltage window of 2.3 V4.5 V.The battery with CoFe2O4 roasted at 650℃ has the largest initial discharge capacity of 2943 mAh/g(electrode),at the current density of 0.02 mA·cm-2,which is 6.7 times higher than that of Ketjen carbon without any catalysts.Futhermore,the over-potential of the battery with CoFe2O4 roasted at 650℃is 0.95 V,which is 0.37 Vhigher compared to the pure Ketjen carbon.
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基本信息:
DOI：
中图分类号:TM911.41
引用信息:
[1]崔雷杰,王相君,段梦雅等.纳米铁酸钴的制备及其在锂氧电池中的应用[J].电池工业,2018,22(02):72-77.
基金信息:
山西省青年科技研究基金(201701D221069,2015021042);; 山西省自然科学基金(2012011008-4);; 太原科技大学博士科研启动金(20162016)