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

doi:10.61558/2993-074X.1842

电化学 >

2007 , Vol. 13 >Issue 4: 403 - 406

DOI: https://doi.org/10.61558/2993-074X.1842

研究论文

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

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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

网络出版日期: 2007-11-28

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Preparation and Properties of High Capacity LiFePO_4

LI Jun ,
LAI Gui-tang ,
HUANG Hui-min ,
LI Da-guang ,
XIA Xin-de

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(1.School of Chemical Engineering,Guangdong University of Technology,Guangzhou 510006,Guangdong,China,2.Guangzhou Penghui Battery Ltd.,Guangzhou 511483,Guangdong,China

Received date: 2007-11-28

Revised date: 2007-11-28

Online published: 2007-11-28

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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

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李军 , 赖桂棠 , 黄慧民 , 李大光 , 夏信德 . 高比能LiFePO_4的制备及性能研究[J]. 电化学, 2007 , 13(4) : 403 -406 . DOI: 10.61558/2993-074X.1842

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

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