LiNi1/3Co1/3Mn1/3O2@C复合材料的制备及电化学性能  

Preparation and Electrochemical Performance of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_2@C Composite

作　　者：王坤 黄梦怡[2] 张小颂 黄俊杰[2] 邓祥 刘长路 

机构地区：[1]四川文理学院化学化工学院,达州635000 [2]绍兴文理学院化学化工学院,绍兴312000

出　　处：《高等学校化学学报》2018年第1期141-147,共7页Chemical Journal of Chinese Universities

基　　金：浙江省重点研发计划项目(批准号：2015C01002); 绍兴市科技局项目(批准号：2014B70016); 四川文理学院科研项目(批准号：2016KZ002Y)资助~~

摘　　要：采用活性炭吸附含Co^(2+),Mn^(2+),Ni^(2+)和Li^+的乙酸盐混合溶液,辅以高温热处理制备了碳包覆LiNi_(1/3)Co_(1/3)Mn_(1/3)O2(NCM@C).透射电子显微镜(TEM)观测结果表明,碳包覆层的厚度约为10 nm.电化学性能测试结果表明,在0.2C下首次放电比容量为181 m A·h/g,首次充放电效率为90.7%;在20C倍率下,NCM@C仍具有78 m A·h/g的放电比容量,而采用溶胶凝胶法制备的Li Ni_(1/3)Co_(1/3)Mn_(1/3)O2(NCM)的比容量仅为39 m A·h/g;NCM@C还表现出良好的循环稳定性,在0.2C倍率下循环50周容量保持率为88.1%,而NCM容量保持率仅为66.4%.Carbon coated Li Ni_（1/3）Co_（1/3）Mn_（1/3）O2（ NCM@C） was prepared by active carbon to adsorb the mixed solution of acetate salts of Co^（2＋）,Mn^（2＋）,Ni^（2＋）and Li＋. Transmission electron microscopy（ TEM） image shows that the surfaces of Li Ni_（1/3）Co_（1/3）Mn_（1/3）O_2 particles are homogeneously coated by carbon with a thickness about 10 nm. The initial discharge capacity of NCM@C is 181 m A·h/g at 0. 2 C,and its initial Columbic efficiency is 90. 7%. Meanwhile,the discharge capacity of NCM@C is 78 m A·h/g at 20 C,while it is only39 m A·h/g for Li Ni_（1/3）Co_（1/3）Mn_（1/3）O2（ NCM） that prepared by a co-precipitation method. NCM@C also shows good cycling stability,the capacity retention is 88. 1% after 50 cycles at 0. 2 C,while it is only 66. 4% for NCM.

关 键 词：LI Ni1/3Co1/3Mn1/3O2 碳包覆 正极材料 锂离子电池 电化学性能 

分 类 号：O646[理学—物理化学]