Ce包覆锂离子高镍正极材料的合成及改性研究

Study on Synthesis and Modification of Ce Coated Lithium Ion High Nickel Cathode Materials

将单水氢氧化锂和前驱体(化学式为:Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2))通过固相混合和高温烧结的工艺制备正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2),再通过液相法在材料表面包覆不同含量的Ce包覆层。用XRD,SEM,扣式电池对样品进行测试表征,分析Ce包覆量对材料结构,形貌,电化学性能的影响。实验结果表明:合成的高镍正极材料具有R-3m空间结构六方晶系a-NaFe0_(2)型结构,包覆量为0.5%时,容量达到最大216.55mAh/g,50次循环后保持率达到87.44%,综合性能最佳。

The cathode material Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2)is prepared by solid phase mixing and high-temperature sintering of Lithium oxide monohydrate and precursor(chemical formula:Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2)),and then the material surface is coated with Ce coating layers of different contents by liquid phase method.XRD,SEM,and Coin cell were used to test and characterize the effect of Ce coating amount on the material structure,morphology,and electrochemical performance.The experimental results show that the synthesized high nickel cathode material has a R-3m spatial structure with a-NaFe0_(2)type structure.When the coating amount is 0.05%,the maximum capacity reaches 216.55 mAh/g,and the retention rate reaches 87.44%after 50 cycles.The comprehensive performance is the best.