高镍系正极材料LiNi0.88Co0.07Al0.05O2的制备及性能表征  

Preparation and Characterization of LiNi0.88Co0.07Al0.05O2 as a High Nickel Cathode Material

作　　者：罗京 刘建雄[1] 黄玲 肖方明 李文超 唐仁衡 王英 LUO Jing;LIU Jian-Xiong;HUANG Ling;XIAO Fang-Ming;LI Wen-Chao;TANG Ren-Heng;WANG Ying(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;Guangdong Provincial Key Laboratory of Rare Earth Development and Application,Guangzhou 510650,China;Institute of Rare Metals,Guangdong Academy of Sciences,Guangzhou 510650,China)

机构地区：[1]昆明理工大学,材料科学与工程学院,昆明650093 [2]广东省稀土开发及应用重点实验室,广州510650 [3]广东省科学院稀有金属研究所,广州510650

出　　处：《无机化学学报》2021年第1期110-120,共11页Chinese Journal of Inorganic Chemistry

基　　金：广州市科技计划项目(No.201907010009);广东省科学院项目(No.2019GDASYL-0105057);广东省科技计划项目(No.2015B010116002);广东省科学院能力建设专项项目(No.2018GDASCX-0110)资助。

摘　　要：以镍钴氢氧化物为原料,采用异丙醇铝水解法合成Ni0.88Co0.07Al0.05(OH)2,将前驱体与锂源充分混合,通过3种烧结条件制备出球形LiNi0.88Co0.07Al0.05O2正极材料,借助X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、X射线光电子能谱(XPS)以及电化学测试等表征手段对材料的晶体结构、微观形貌和电化学性能进行了较系统的研究。研究表明,在500℃下保温3 h、700℃下保温14 h的条件下合成的LiNi0.88Co0.07Al0.05O2具有良好的综合电化学性能,0.2C放电比容量达192.2 mAh·g^-1,首次充放电效率为81.6%,1C放电比容量为190.7 mAh·g^-1,100周后放电比容量为141.1 mAh·g^-1,容量保持率达到73.4%。In this work,Ni0.88Co0.07Al0.05(OH)2 was synthesized by aluminum isopropoxide hydrolysis of nickel-cobalt hydroxide as raw material.The precursor was fully mixed with lithium source,and spherical LiNi0.88Co0.07Al0.05O2 cathode material was prepared through three sintering conditions.The crystalline structure,morphology and electrochemical performance were systematically characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscope(TEM),X-ray photoelectronic spectroscopy(XPS)and electrochemical tests.It is found that the synthesized LiNi0.88Co0.07Al0.05O2 after 500℃for 3 h,and 700℃for 14 h has a good comprehensive electrochemical performance.The discharge specific capacity at 0.2C was up to 192.2 mAh·g^-1,the first charge-discharge efficiency was 81.6%,and the discharge specific capacity at 1C was 190.7 mAh·g^-1,and still remain in 141.1 mAh·g^-1 after 100 weeks,which shows the capacity retention rate of 73.4%.

关 键 词：锂离子电池 正极材料 LiNi0.88Co0.07Al0.05O2 异丙醇铝水解 烧结方式 

分 类 号：TM912[电气工程—电力电子与电力传动]