通过葡萄糖辅助低温燃烧制备ZnO包覆型LiMn2O4,利用X射线衍射仪、扫描电子显微镜、循环伏安、交流阻抗以及恒流充放电测试等手段,研究了温度对产物晶体结构、微观形貌及电化学性能的影响.XRD结果表明所有产物均为单相尖晶石型LiMn2O4结构.SEM结果表明产物的颗粒尺寸随温度的升高而增大.电化学性能测试表明400℃和500℃制备的LiMn2O4/ZnO具有相对优异的电化学性能,室温1C条件下首次放电比容量分别为119.3 mAh/g、116.3 mAh/g,循环100次后容量保持率分别85.6%、87.8%.尖晶石LiMn2O4电极的阻抗谱特征与温度有关,电池的电化学性能主要受电荷转移电阻(Rct)影响.
A low temperature glucose-assisted combustion method was applied to modify the surface of spinel LiMn2O4 cathode material by zinc oxide.The effects of calcination temperature on structure,particle size,morphology and electrochemical performance of the powders were studied in detail by X-ray diffraction (XRD),scanning electron microscopy (SEM),cyclic voltammetry (CV),electrochemical impedance spectroscopy (EIS)and galvanostatic charge-discharge test.XRD pattern indicated that all the powders were a single-phase crystal.It could be observed that the particle size increased with calcination temperature from the SEM images.The materials calcined at 400 ℃and 500 ℃ demonstrated excellent electrochemical performance with initial discharge specific capacities of 119.3 mAh/g and 116.3 mAh/g,and capacity retentions of 85.6% and 87.8% after 100 cycles at 1C,respectively.The analyses inferred that,the Nyquist plots of spinel LiMn2O4 electrode related to the temperature,and the electrochemical per-formance mainly depended on the charge-transfer resistance (Rct ).
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