Co-Mn比例调控对LiNi_(0.8)Co_(0.10-y)Mn_(0.05+y)Al_(0.05)O_(2)材料性能影响探究  

Influence of cobalt-manganese ratio adjustment on the properties of LiNi_(0.8)Co_(0.10-y)Mn_(0.05+y)Al_(0.05)O_(2)materials

作　　者：杨伟[1] 王昱杰 方凯斌 邹汉波[1] 陈胜洲[1] 刘自力[1] YANG Wei;WANG Yujie;FANG Kaibin;ZOU Hanbo;CHEN Shengzhou;LIU Zii(School of Chemistry and Chemical Engineering,Guangzhou University,Guangzhou 510006,Guangdong,China)

机构地区：[1]广州大学化学化工学院,广东广州510006

出　　处：《化工学报》2022年第12期5615-5624,共10页CIESC Journal

基　　金：广东省自然科学基金项目(2022A1515011715);广州市科技计划项目(202201010079)。

摘　　要：采用共沉淀法,以草酸为沉淀剂,过渡金属锰作为钴的替代元素,制备了系列不同钴锰比例的镍钴锰铝锂(LiNi_(0.8)Co_(0.10-y)Mn_(0.05+y)Al_(0.05)O_(2),y=0.01,0.02,0.03,0.04)四元材料,研究锰对钴的逐步取代对镍钴锰铝锂四元材料的性能产生的影响。实验结果表明,当y=0.02时的LiNi_(0.8)Co_(0.08)Mn_(0.07)Al_(0.05)O_(2)材料具有最好的形貌、结构发育程度以及电化学性能。钴锰共掺杂对合成的LiNi_(0.8)Co_(0.10-y)Mn_(0.05+y)Al_(0.05)O_(2)材料产生了协同作用,且锰掺杂比例低于钴时可以提升材料电化学容量,当锰掺杂比例超过钴时容量开始下降,说明掺杂比例过多的锰对合成的高镍四元材料的电化学性能提升没有助益。A series of LiNi_(0.8)Co_(0.10-y)Mn_(0.05+y)Al_(0.05)O_(2)(y=0.01,0.02,0.03,0.04)materials with different cobalt-manganese ratios were prepared by co-precipitation method with oxalic acid as precipitant and transition metal manganese as cobalt replacement element,and the effect of gradual substitution of manganese for cobalt on the properties of Ni rich quaternary materials was studied.The experimental results show that the LiNi_(0.8)Co_(0.08)Mn_(0.07)Al_(0.05)O_(2)material had the best morphology,structural development and electrochemical performance.The co-doping of cobalt and manganese has a synergistic effect on the synthesized LiNi_(0.8)Co_(0.10-y)Mn_(0.05+y)Al_(0.05)O_(2)material,and the electrochemical capacity can be improved when the ratio of manganese doping is lower than that of cobalt.When the doping ratio of manganese exceeds that of cobalt,the capacity begins to decrease,indicating that the excessive doping ratio of manganese is not helpful for the improvement of the electrochemical performance of the synthesized high-nickel quaternary materials.

关 键 词：电化学 锂离子电池 高镍四元材料 合成 纳米材料 

分 类 号：TM912[电气工程—电力电子与电力传动]