欢迎访问《电化学(中英文)》期刊官方网站,今天是

电化学(中英文) ›› 2007, Vol. 13 ›› Issue (4): 403-406. 

• 研究论文 • 上一篇    下一篇

高比能LiFePO_4的制备及性能研究

李军;赖桂棠;黄慧民;李大光;夏信德;   

  1. 广东工业大学轻工化工学院,广东工业大学轻工化工学院,广东工业大学轻工化工学院,广东工业大学轻工化工学院,广州市鹏辉电池有限公司博士后工作站 广东广州510006,广州市鹏辉电池有限公司博士后工作站,广东广州511483,广东广州510006,广东广州510006,广东广州510006,广东广州511483
  • 收稿日期:2007-11-28 修回日期:2007-11-28 出版日期:2007-11-28 发布日期:2007-11-28

Preparation and Properties of High Capacity LiFePO_4

LI Jun1,2,LAI Gui-tang1,HUANG Hui-min1,LI Da-guang1,XIA Xin-de2   

  1. (1.School of Chemical Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China,2.Guangzhou Penghui Battery Ltd.,Guangzhou 511483,Guangdong,China
  • Received:2007-11-28 Revised:2007-11-28 Published:2007-11-28 Online:2007-11-28

摘要: 应用液相沉淀法-固相烧结法制备高密度的LiFePO4/C及纯相LiFePO4.X射线衍射、扫描电镜、傅立叶红外光谱仪、电化学性能测试表明:该样品具有单一的橄榄石结构和3.4 V左右的放电平台,掺碳的LiFe-PO4具有更优良的性能,粒度较小粒径分布均匀,振实密度达1.46 g/cm3,0.1C首次放电比容量为144.6mAh/g,循环20次后容量保持率为93.2%,1C倍率首次放电比容量为133.5 mAh/g,循环20次后容量下降8.76%.

关键词: 锂离子电池, 正极材料, LiFePO4, 高比能

Abstract: Carbon-doped LiFePO4/C and pure phase LiFePO4 cathode materials were prepared by liquid-state precipitation reaction.The results of XRD,SEM,elemental analysis,FTIR and A.C.impedance tests show that the samples have had olivine structure and a 3.4V discharge platform.The tapped density of LiFePO4/C sample could reach 1.46g/cm3,the initiate discharge capacity is 144.6mAh/g at 0.1C,which remained capacity is 93.2% after 20 cycles.The first discharge capacity is 133.5mAh/g at 1C and the capacity decreased 8.76% after 20 cycles.

Key words: lithium ion battery, cathode materials, lithium iron phosphate, high capacity

中图分类号: