摘要
采用聚乙二醇辅助的溶胶-凝胶法制备了锂离子电池复合正极材料LiCo1-xVxPO4/C(x=0、0.03和0.05)。X射线衍射(XRD)表明掺杂的V进入了LiCoPO4晶格内部。扫描电镜(SEM)和透射电镜(TEM)显示LiCo0.97V0.03PO4/C的粒径分布在200~700nm之间,颗粒表面包覆一层约30nm厚的碳层。在0.1C倍率下,LiCo0.97V0.03PO4/C和LiCoPO4/C的首次放电容量分别为111和70mAh/g。掺杂V不仅能够改善材料的循环稳定性而且提高了材料的放电电压平台。
LiCo1-xVxPO4/C(x=0,0.03 and 0.05) composites were prepared via a poly(ethylene glycol) assisted sol-gel method and exploited as cathode materials for lithium ion batteries.X-ray diffraction(XRD) patterns of the samples indicate that vanadium is introduced into LiCoPO4 matrix structure.The scanning electron microscopy(SEM) and transmission electron microscopy(TEM) show that the LiCo0.97V0.03PO4/C displays a particle distribution from 200 to 700 nm and is also coated with a carbon layer of about 30nm in thickness.The initial discharge capacity of LiCo0.97V0.03PO4/C and LiCoPO4/C are 111 and 70mAh/g,respectively.The vanadium modification not only improves the cyclic stability but also enhances the discharge voltage plateaus.
出处
《功能材料》
EI
CAS
CSCD
北大核心
2011年第4期679-681,共3页
Journal of Functional Materials
基金
安徽省高校青年教师资助计划资助项目(2007jq1156)
安徽高校省级自然科学研究资助项目(KJ2009B250Z)
2011年度淮北师范大学青年科研资助项目(201132)
关键词
锂离子电池
磷酸钴锂
正极材料
离子掺杂
高电压
lithium ion batteries
lithium cobalt phosphate
cathode material
ion doping
high-voltage