Na^(+)掺杂对LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料电化学性能的影响  

Effect of Na^(+) Doping on Electrochemical Properties of Lini_(0.8)Co_(0.1)Mn_(0.1)O_(2) Improved by Doping Sodium Ions

作　　者：陈绍军[1] 丁波 丁安莉 李春来[1] CHEN Shaojun;DING Bo;DING Anli;LI Chunlai(Heyuan Polytechnic,Heyuan 517000,China;Guangdong New Lingjia New Energy Incorporated Co.,Ltd.,Heyuan 517000,China)

机构地区：[1]河源职业技术学院,广东河源517000 [2]广东新凌嘉新能源股份有限公司,广东河源517000

出　　处：《材料科学与工程学报》2021年第5期843-846,共4页Journal of Materials Science and Engineering

基　　金：河源市2018年省科技创新战略专项资助项目(河科2018002);广东省普通高校特色创新类资助项目(2019GKTSCX108);河源职业技术学院2020年校级科技计划资助项目(2020KJ-01)。

摘　　要：高镍三元正极材料LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(简称NCM811)是非常有前景的动力电池用锂离子电池正极材料。LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)具有比容量高、成本低、环保等优点,但也存在锂镍混排严重,容量衰减快等缺点。为解决这些问题,促进该材料在动力电池中的应用进程,本研究采用高温固相法合成了NCM811,并通过Na+掺杂对材料进行改性。采用X射线衍射仪(XRD)、扫描电镜(SEM)对材料进行形貌和结构表征。采用循环伏安(CV)、循环、倍率以及电化学阻抗(EIS)等手段研究材料的电化学性能。研究结果表明:在2.7~4.3V,0.5C放电条件下,当Na^(+)掺杂量为0.1摩尔分数时,显示了185mAh/g的初始放电比容量,循环100次后,仍保持151mAh/g,显示出较好的循环性能。在0.2C,0.5C,1C,2C,5C和10C下材料的放电比容量分别为195,184,158,137,112和90mAh/g,展现出较好的倍率性能。因此,适量的Na+掺杂能有效提高NCM811材料的电化学性能。High-nickel ternary LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)(NCM811) is a very promising cathode material of lithium ion batteries.It has the advantages of high specific capacity,low cost,environmental protection,etc.,but it also has the disadvantages of serious lithium nickel mixing and rapid capacity decay.In order to overcome these shortcomings,NCM811 was synthesized by high temperature solid phase method and electrochemically modified by Na^(+) doping.The morphology and structure of the material were characterized by XRD and SEM.The electrochemical properties were studied by means of CV,cycle,rate performance and EIS.The results showed that the first discharge specific capacity of the 0.1 mol Na^(+) doped material reached 185 mAh/g,and after 100 cycles,the specific discharge capacity was 151 mAh/g under the conditions of 2.7-4.3 Vand 0.5 C discharge,which showed good cycle performances.Simultaneously,the material had specific discharge capacities of 195,184,158,137,112 and 90 mAh/g at 0.2 C,0.5 C,1 C,2 C,5 Cand 10 C,showing better rate performance.Therefore,an appropriate amount of Na^(+) doping can effectively improve the electrochemical performances of NCM811.

关 键 词：高镍三元LiNi_(0.8)Co_(0.1)Mn_(0.1)O_(2)正极材料 钠离子掺杂 电化学性能 

分 类 号：TM912[电气工程—电力电子与电力传动]