铝箔涂碳层厚度对锂离子电池性能的影响

Effect of carbon-coated thickness of aluminum foil on performance of Li-ion battery

通过SEM、电化学阻抗谱(EIS)和循环伏安(CV)等测试,研究铅箔涂碳层厚度对锂离子电池性能的影响。与光铝箔比,双面涂碳铝箔的EIS阻抗值小,且随着涂碳层厚度的增加,先变小再增大;当涂碳层总厚度为2.0μm时,电池的阻值最小;在低温下,涂碳层总厚度为2.0μm时电池的放电平台最高,极化最轻,释放的电量最多。全电池测试表明:在常温0.5C和2.0C下循环(100%DOD),性能由高到低,使用涂碳层总厚度分别为2.0μm、3.0μm、1.0μm和0的电池,在常温1.0C下循环(100%DOD),性能由高到低,使用涂碳层总厚度分别为0、2.0μm、3.0μm和1.0μm。

SEM,electrochemical impedance spectroscopy(EIS)and cyclic voltammetry(CV)tests were used to analyze the effect of carbon-coated thickness of cathode collector on the performance of Li-ion battery.Compared with the foil without carbon-coated,the EIS impedance of carbon-coated aluminum foil was smaller.With the increase of the carbon coating thickness,the impedance of the positive plate became smaller and then increased.When the total thickness of carbon-coated layer was 2.0μm,the resistance value of battery was the minimum.Used the foil with a total carbon-coated layer thickness of 2.0μm,the battery had the highest discharge platform,the lightest polarization and the maximum power at low temperatures.When cycled with 0.5C,2.0C(100%DOD)at room temperature,the battery performance from high to low was as follows:the total thickness of carbon-coated layer was 2.0μm>3.0μm>1.0μm>0,that of 1.0C 100%DOD cycle was 0>2.0μm>3.0μm>1.0μm.