摘要
以自制Ni0.4Co0.2Mn0.4(OH)2前驱体和Li_2CO_3为原料,在空气气氛下采用固相烧结工艺制备了LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2锂离子电池正极材料。通过SEM和XRD等手段对材料烧结前后形貌与结构进行表征,并测试了烧结后锂离子电池正极材料的电化学性能。结果表明,Ni0.4Co0.2Mn0.4(OH)2前驱体具有良好的片状嵌入结构,且烧结制备的LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2正极材料混排因子c/a=4.967 3,阳离子混排因子I(003)/I(104)=1.25、I(006+102)/I(101)=0.333、I(018)/I(110)=0.87,表明LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2具有良好的层状结构。在2.5~4.6V、0.2C和0.5C下,LiNi_(0.4)Co_(0.2)Mn_(0.4)O_2正极材料的首次放电比容量分别为166和154mAh/g,循环80次后容量分别保持为111和100mAh/g,具有良好的电化学性能。
LiNi（0.4）Co（0.2）Mn（0.4）O2 cathode material for Li-ion batteries was synthesized by sintering process with Ni0.4 Co0.2 Mn0.4（OH）2 precursor and Li2 CO3 as raw materials in air atmosphere.Morphology and crystal structure were evaluated by SEM and XRD before and after sintering Ni0.4 Co0.2 Mn0.4（OH）2 precursor with Li2 CO3.Electrochemical properties of LiNi0.4Co0.2Mn0.4O2 cathode material were tested.The results show that primary particles of Ni0.4 Co0.2 Mn0.4（OH）2 precursor are of obvious layered structure.Cathode material LiNi0.4Co0.2Mn0.4O2 has obvious hexagonal layered type structure with low cation mixing factor of c/a=4.967 3,ratio of characteristic peaks I（003）/I（104）=1.25,I（006＋102）/I（101）=0.333,and I（018）/I（110）=0.87.The initial discharge capacity of LiNi0.4Co0.2Mn0.4O2 is 166 and154 mAh/g respectively in the voltage range of 2.5～4.6 Vat 0.2 Cand 0.5 C.The reversible capacity is111 and 100 mAh/g respectively after 80 cycles.
作者
梁卫春
郭欢
吴理觉
靖青秀
LIANG Wei-chun;GUO Huan;WU Li-jue;JING Qing-xiu(Guangdong Jiana Energy Technology Co.,Ltd.,Qingyuan 511500,Guangdong,China;Qingyuan Jiazhi New Materials Research Institute Co.,Ltd.,Qingyuan 511500,Guangdong,China;Jiangxi University of Science and Technology,Ganzhou 341000,Jiangxi,China)
出处
《有色金属（冶炼部分）》
CAS
北大核心
2018年第11期51-55,共5页
Nonferrous Metals（Extractive Metallurgy)
基金
广东省扬帆计划引进创新创业团队专项基金(粤财教[2017]108号)
