共沉淀法合成高镍三元Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2)前驱体的可控制备  

Controlled Fabrication of High Nickel Ternary Ni_(0.8)Co_(0.1)Mn_(0.1)(OH)_(2) Precursors by Co-precipitation Method

作　　者：张业男 王韵珂 戴永年[1] 姚耀春[1] 李永梅[1] ZHANG Yenan;WANG Yunke;DAI Yongnian;YAO Yaochun;LI Yongmei(National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学真空冶金国家工程实验室,昆明650093

出　　处：《有色金属工程》2021年第11期111-118,共8页Nonferrous Metals Engineering

基　　金：国家自然科学基金资助项目(51364201);云南省自然科学基金资助项目(2018HB012)。

摘　　要：影响高镍三元材料性能的关键步骤在于前驱体的制备,利用共沉淀法制备前驱体,底液氨水浓度作为三元前驱体制备的重要控制条件,可以对前驱体的形貌产生非常大的影响,从而影响成品正极材料的电化学性能。通过控制共沉淀制不同氨水底液浓度制备了三组样品材料。利用SEM、XRD考察了对结构的影响,并进一步探究了材料的电化学性能。结果表明,底液氨水浓度对合成组分均一、形貌均匀的前躯体十分重要,且直接影响烧结后的LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料的电化学性能。利用相同的共沉淀反应条件,在底液氨水浓度0.5 mol/L条件下合成得到的前躯体材料表现出更为优异的倍率和循环性能,在0.1、0.2、0.5、1、2、5和10C下的放电比容量分别为168.8、161.6、153.2、144.4、133.2、88.5和5.7 mAh/g。The preparation of precursors is the pivotal step to affect the properties of high nickel ternary materials.The concentration of ammonia in the bottom liquid is an important control condition for the preparation of ternary precursor system,during the precursors were prepared via co-precipitation method.The concentration of ammonia in the bottom solution can have a great influence on the morphology of the precursor,thus affecting the electrochemical properties of the finished cathode materials.Three groups of sample materials were prepared by controlling co-precipitation with different concentration of ammonia water concentration.SEM and XRD were used to investigate the influence of the structure,and the electrochemical properties of the material were further explored.The results show that the concentration of ammonia in the bottom solution is vital for the precursor with uniform composition and uniform morphology.Moreover,the electrochemical properties of sintered LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2) cathode materials are directly affected.Using the same co-precipitation reaction conditions,under the condition of 0.5 mol/L ammonia concentration in the bottom solution,the precursor materials show better rate and cycling performance.The discharge specific capacities at 0.1,0.2,0.5,1,2,5 and 10C are 168.8,161.6,153.2,144.4,133.2,88.5 and 5.7 mAh/g,respectively.

关 键 词：三元材料 正极材料 共沉淀 锂离子电池 

分 类 号：TM912[电气工程—电力电子与电力传动]