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钒掺杂LiCoPO_4正极材料的制备及电化学性能 被引量:3

Preparation and electrochemical performance of V-doped LiCoPO_4 cathode materials
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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
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同被引文献29

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