窄粒径高镍单晶三元前驱体的制备与研究  

Preparation and Research of Narrow Particle Size High Nickel Single Crystal Ternary Precursor

作　　者：高策 张素良 吴志龙 杨洋 GAO Ce;ZHANG Su-liang;WU Zhi-long;YANG Yang

机构地区：[1]中冶瑞木新能源科技有限公司,河北唐山063200

出　　处：《有色设备》2023年第2期17-22,37,共7页Nonferrous Metallurgical Equipment

摘　　要：本文采用间断法工艺制备窄粒径高镍单晶三元前驱体,反应初期向反应釜内通入氮气保护防止晶核失控,然后通空气氧化前驱体以调节其微观形貌。探究了合成底液pH、氨浓度、空气流量等参数对前驱体物性指标的影响,得到最佳工艺条件:底液pH值11.2,氨浓度0.1~0.15 mol/L,空气流量0.5~1 m~3/h。在最佳工艺条件下制备三元前驱体Ni_(0.7)Co_(0.1)Mn_(0.2)(OH)_(2)具有粒度分布窄、结晶度高、一次颗粒形貌规则、二次颗粒内部呈放射状的特点,其混锂烧结后的正极材料在3.0~4.3 V,0.1C/0.1C充放电制度下,首次放电容量为180.1 mAh/g,首次效率为90.22%。The ternary precursor of high nickel single crystal with narrow particle size was prepared by discontinuous method.At the beginning of the reaction,nitrogen was introduced into the reactor to prevent the crystal nucleus from being out of control,and then the precursor was oxidized by air to modify its microstructure.The effects of pH,ammonia concentration and air flow rate on the physical properties of the precursor were investigated.The optimum conditions were as follows:pH 11.2,ammonia concentration 0.1~0.15 mol/L,air flow rate 0.5~1 m~3/h.The ternary precursor Ni_(0.7)Co_(0.1)Mn_(0.2)(OH)_(2) which prepared under optimal conditions has the characteristics of narrow particle size distribution,high crystallinity,regular primary particle morphology and radiate inside the secondary particle.The first discharge capacity of the cathode material sintered by the precursor and lithium is 180.1 mAh/g and the first efficiency is 90.22% under the charge-discharge system of 3.0~4.3 V,0.1C/0.1C.

关 键 词：三元前驱体 窄粒径 PH 氨浓度 氧化 形貌 

分 类 号：TM912[电气工程—电力电子与电力传动]