Zr、W共掺杂对LiNi0.88Co0.06Mn0.06O2形貌及电化学性能的影响  

Effect of Zr/W Co-doped on Morphology and Electrochemical Performance of LiNi0.88Co0.06Mn0.06O2 for Lithium-Ion Batteries

作　　者：阮丁山 林波 胡国荣 杜柯 刘伟健 陈希文 许帅军 罗翠苹 缪建麟 陈喜 李长东 RUAN Ding-Shan;LIN Bo;HU Guo-Rong;DU Ke;LIU Wei-Jian;CHEN Xi-Wen;XU Shuai-Jun;LUO Cui-Ping;MIAO Jian-Lin;CHEN Xi;LI Chang-Dong(School of Metallurgy and Environment,Central South University,Changsha 410083,China;Guangdong Brunp Recycling Technology Co.,Ltd.,Foshan,Guangdong 528100,China)

机构地区：[1]中南大学冶金与环境学院,长沙410083 [2]广东邦普循环科技有限公司,佛山528100

出　　处：《无机化学学报》2020年第12期2289-2298,共10页Chinese Journal of Inorganic Chemistry

摘　　要：采用共沉淀法制备前驱体Ni0.88Co0.06Mn0.06(OH)2,经高温固相烧结合成一次颗粒分散良好的高镍三元材料,探索了氧化锆(ZrO2)与氧化钨(WO3)共掺杂对材料一次颗粒的形貌及电化学性能的影响。结果表明,Zr掺杂对LiNi0.88Co0.06Mn0.06O2(NCM-Z)一次颗粒的尺寸影响不大,但可以改善材料的循环性能;而引入W形成Zr和W共掺杂后,获得的NCM-ZW一次颗粒明显变小,材料形貌从分散的一次颗粒变成二次颗粒团聚体,因此推测W可抑制晶体生长。为了进一步合成一次颗粒分散良好的Zr和W共掺杂正极材料,研究了烧结温度对一次颗粒生长的影响,最终在900℃下保温12 h,得到了一次颗粒分散良好的Zr和W共掺杂正极材料。XRD结果表明,900℃烧结的Zr和W共掺杂样品具有良好的层状结构与较低的阳离子混排度。该样品在0.1C下首次放电容量为203.7 mAh·g^-1;5C大倍率下容量可达151.2 mAh·g^-1,经过100周循环后,放电容量保持率为84.6%。The precursor Ni0.88Co0.06Mn0.06(OH)2 was prepared by coprecipitation method.Ni-rich material with good primary particles dispersion were synthesized by high temperature solid-state sintering.The effects of ZrO2 and WO3 doped on the primary particles morphology and electrochemical properties of cathode materials was explored.The results showed that Zr doped had little effect on the morphology of LiNi0.88Co0.06Mn0.06O2(NCM-Z),especially on the size of primary particles,but it could improve the cycle performance of the material.When W was introduced to form Zr and W co-doped,the primary particles of NCM-ZW obtained become smaller obviously,and the morphology of the material changed from dispersed primary particles to secondary aggregates,so W could inhibit the crystal growth.Furthermore,in order to synthesize Zr and W co-doped Ni-rich material with good primary particles dispersion,the influence of sintering temperature on the synthesis of Ni-rich material was studied.Finally,the Ni-rich material with primary particles dispersion morphology could be obtained by sintering at 900℃for 12 hours.XRD results showed that Zr and W co-doped sample which was sintered at 900℃ had batter layered structure and lower cation mixing.The first discharge capacity of the sample was 203.7 mAh·g^-1 at 0.1C.In addition,the capacity was 151.2 mAh·g^-1 at 5C,after 100 cycles,the retention rate of discharge capacity was 84.6%.

关 键 词：锂离子电池 正极材料 一次颗粒 锆掺杂 钨掺杂 

分 类 号：O646.21[理学—物理化学]