AlPO_4表面包覆对锂离子阴极材料LiFePO_4性能影响研究

本研究使用电化学惰性材料AlPO_4对锂离子电池阴极材料LiFePO_4表面进行改性。研究结果表明,在较低电流密度条件下,改性后的材料表现出较好的电化学性能,这主要归结于AlPO_4材料能够有效的减小电解液对电极材料的侵蚀,提高材料结构在循环过程中的稳定性。然而在较大电流密度条件下,改性后材料的电化学性能有较大幅度的下降,这主要是由于电化学惰性材料产生的内阻对快速充放电的影响较大。

In this study, lithium ion battery cathode material LiFePO4 was modified by electrochemical inert material AIPO4. The results show that the electrochemical performance of modified material is better at lower current density, which is mainly due to the fact that can ef-fectively reduce the erosion of the electrode material from the electrolyte and improve the structure stability of the material during the cycle. However, under the condition of large current density, the electrochemical performance of the modified material is greatly decreased, which is mainly due to the influence of the internal resistance of the electrochemical inert material ALPO4 on the rapid charge and discharge.