前驱体合成工艺对高镍三元正极材料性能的影响  

Influence of Precursor Synthesis Process on Nickel-Rich NCM Cathodes

作　　者：白立雄 贡浩天 甘柏瑶 周春仙 朱健 周友元 杨亚辉 杨立山 BAI Lixiong;GONG Haotian;GAN Boyao;ZHOU Chunxian;ZHU Jian;ZHOU Youyuan;YANG Yahui;YANG Lishan(Minmetals New Energy Materials(Hunan)Co.,Ltd.,Changsha 410205,Hunan,China;School of Chemistry and Chemical Engineering,Hunan Normal University,Changsha 410081,Hunan,China)

机构地区：[1]五矿新能源材料(湖南)股份有限公司,湖南长沙410205 [2]湖南师范大学化学化工学院,湖南长沙410081

出　　处：《矿冶工程》2025年第1期133-137,142,共6页Mining and Metallurgical Engineering

基　　金：国家自然科学基金重点项目(52234001);湖南省教育厅科学重点研究项目(22A0045)。

摘　　要：研究了连续法和半连续法前驱体合成工艺对前驱体材料和高镍三元正极材料结构与性能的影响。结果表明,2种工艺合成的前驱体一次颗粒形貌存在显著差异,导致合成的正极材料一/二次颗粒结构及其电化学性能有所不同。2种前驱体制备的正极材料在扣式半电池中的性能差异较小,但在软包电池中却呈现出显著差异:采用半连续法制备的高镍正极在低荷电状态下具有较低的阻抗,45℃下循环750次后容量保持率为87.61%,显著优于连续法制备的高镍正极的容量保持率(77.65%)。半连续前驱体合成工艺在高镍正极材料生产中具备更大优势。The effects of continuous and semi-continuous synthesis processes of precursor on the structure and performance of precursor materials and nickel-rich NCM cathode materials were explored.The results show that primary particles of the precursors synthesized by these two processes are quite different in morphology,leading to the difference in structure of primary/secondary particles and electrochemical property of the correspondingly synthesized cathode materials.These two cathode materials present little different performance in a button half cell,but significant difference in a soft pack battery.The nickel-rich cathode synthesized by the semi-continuous process has a lower impedance at a low state of charge,and retains 87.61%of its capacity after 750 cycles at 45℃,much higher than the retention rate(77.65%)of the nickel-rich cathode synthesized by the continuous process.It is concluded that the semi-continuous synthesis process for precursor is superior in the production of nickel-rich cathode materials.

关 键 词：锂离子电池 前驱体 正极材料 循环稳定性 高镍三元正极 连续法 半连续法 

分 类 号：TM911[电气工程—电力电子与电力传动]