Doping effects of zinc on LiFePO4 cathode material for lithium ion batteries

被引:489
作者
Liu, H.
Cao, Q.
Fu, L. J.
Li, C.
Wu, Y. P. [1 ]
Wu, H. Q.
机构
[1] Fudan Univ, Dept Chem, Shanghai 200433, Peoples R China
[2] Fudan Univ, Shanghai Key Lab Mol Catalysis & Innovat Mat, Shanghai 200433, Peoples R China
关键词
LiFePO4; doping; Zn; lithium ion battery;
D O I
10.1016/j.elecom.2006.07.014
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Alien atom doping has been adopted to modify the electrochemical performance of olivine type LiFePO4 for cathode material of the lithium ion batteries. Here, we first report that zinc-doping can improve the performance of LiFePO4. The effects of zinc-doping have been studied by the measurements of X-ray diffraction pattern, scanning electronic microscopy, electrochemical impedance spectroscopy and cyclic voltammetry. The results indicate that the zinc atoms do not destroy the lattice structure of LiFePO4, and enlarge the lattice volume. During de-intercalation and intercalation process of lithium ions, the doped zinc atoms protect the LiFePO4 crystal from shrinking. This kind of "pillar" effect provides larger space for the movement of lithium ions. Consequently, the conductivity is enhanced and the lithium ion diffusion coefficient is boosted after doping. These favourable changes are beneficial to the improvement of the electrochemical performance of LiFePO4 including discharge capacity and rate capability. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:1553 / 1557
页数:5
相关论文
共 31 条
  • [1] Ti-, Al-, and Cu-doping induced gap states in LiFePO4
    Abbate, M
    Lala, SM
    Montoro, LA
    Rosolen, JM
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2005, 8 (06) : A288 - A290
  • [2] Bard A. J., 2001, ELECTROCHEMICAL METH
  • [3] Conductivity improvements to spray-produced LiFePO4 by addition of a carbon source
    Bewlay, SL
    Konstantinov, K
    Wang, GX
    Dou, SX
    Liu, HK
    [J]. MATERIALS LETTERS, 2004, 58 (11) : 1788 - 1791
  • [4] Electronically conductive phospho-olivines as lithium storage electrodes
    Chung, SY
    Bloking, JT
    Chiang, YM
    [J]. NATURE MATERIALS, 2002, 1 (02) : 123 - 128
  • [5] A novel concept for the synthesis of an improved LiFePO4 lithium battery cathode
    Croce, F
    D'Epifanio, A
    Hassoun, J
    Deptula, A
    Olczac, T
    Scrosati, B
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2002, 5 (03) : A47 - A50
  • [6] Electrode materials for lithium secondary batteries prepared by sol-gel methods
    Fu, LJ
    Liu, H
    Li, C
    Wu, YP
    Rahm, E
    Holze, R
    Wu, HQ
    [J]. PROGRESS IN MATERIALS SCIENCE, 2005, 50 (07) : 881 - 928
  • [7] Spectroscopic studies of LixFePO4 and LixM0.03Fe0.97PO4 (M=Cr,Cu,Al,Ti) -: art. no. 024105
    Gouveia, DX
    Lemos, V
    de Paiva, JAC
    Souza, AG
    Mendes, J
    Lala, SM
    Montoro, LA
    Rosolen, JM
    [J]. PHYSICAL REVIEW B, 2005, 72 (02)
  • [8] Approaching theoretical capacity of LiFePO4 at room temperature at high rates
    Huang, H
    Yin, SC
    Nazar, LF
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (10) : A170 - A172
  • [9] Preparation and characteristics of (NayAg1-y)2V4O11 for lithium secondary battery cathodes
    Kawakita, J
    Makino, K
    Katayama, Y
    Miura, T
    Kishi, T
    [J]. JOURNAL OF POWER SOURCES, 1998, 75 (02) : 244 - 250
  • [10] LIU H, IN PRESS ELECTROCHEM