Lithium ion conductivity in single crystal LiFePO4

被引:124
作者
Li, Jiying [1 ,3 ]
Yao, Wenlong [4 ]
Martin, Steve [4 ]
Vaknin, David [1 ,2 ]
机构
[1] Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA
[2] Iowa State Univ Sci & Technol, Dept Phys, Ames, IA 50011 USA
[3] Iowa State Univ Sci & Technol, Dept Phys & Astron, Ames, IA 50011 USA
[4] Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA
关键词
Lithium rechargeable battery; Cathode material; LiFePO4; Ionic conductivity;
D O I
10.1016/j.ssi.2008.06.028
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Although extensively studied as a potential Li rechargeable battery cathode in its powder form, very little is known about the anisotropy of the ionic and electronic transport properties in LiFePO4 as it may be manifested in single crystal studies. Here. we report on the conductivity of lithium ions along three principal axis directions in single crystal LiFePO4 as a function of temperature by AC impedance spectroscopy. Despite the apparent quasi-two dimensional nature of the crystal structure, suggestive of facilitated inplane diffusion, we show that Li diffusion in LiFePO4 is, to a large extent. confined to one dimension through tunnels along b-axis (using the Pnma symmetry group notation), implying oriented powders in batteries may improve the performance of this material as a cathode in rechargeable batteries. Our results may also explain the numerous failed attempts to enhance the ionic conductivity by introducing divalent and trivalent substitutions to Li+ that, although produce vacancies in the Li sheets, may concurrently impede the diffusion in the tunnels. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:2016 / 2019
页数:4
相关论文
共 29 条
  • [1] Anisotropy of electronic and ionic transport in LiFePO4 single crystals
    Amin, Ruhul
    Balaya, Palani
    Maier, Joachim
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2007, 10 (01) : A13 - A16
  • [2] 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
  • [3] Studies of high-temperature phase transition, electrical conductivity, and dielectric relaxation in (NH4)H2PO4 single crystal -: art. no. 044104
    Chen, RH
    Yen, CC
    Shern, CS
    Fukami, T
    [J]. JOURNAL OF APPLIED PHYSICS, 2005, 98 (04)
  • [4] Dielectric and ionic conduction properties in LiYF4 single crystals
    Choi, B
    Moon, B
    Seo, H
    Jeong, J
    Lee, H
    Seo, W
    [J]. MATERIALS & DESIGN, 2000, 21 (06): : 567 - 570
  • [5] Electronically conductive phospho-olivines as lithium storage electrodes
    Chung, SY
    Bloking, JT
    Chiang, YM
    [J]. NATURE MATERIALS, 2002, 1 (02) : 123 - 128
  • [6] STRUCTURE AND ELECTROCHEMISTRY OF LI1+/-YNIO2 AND A NEW LI2NIO2 PHASE WITH THE NI(OH)2 STRUCTURE
    DAHN, JR
    VONSACKEN, U
    MICHAL, CA
    [J]. SOLID STATE IONICS, 1990, 44 (1-2) : 87 - 97
  • [7] Toward understanding of electrical limitations (electronic, ionic) in LiMPO4 (M = Fe, Mn) electrode materials
    Delacourt, C
    Laffont, L
    Bouchet, R
    Wurm, C
    Leriche, JB
    Morcrette, M
    Tarascon, JM
    Masquelier, C
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2005, 152 (05) : A913 - A921
  • [8] The existence of a temperature-driven solid solution in LixFePO4 for 0 ≤ x ≤ 1
    Delacourt, C
    Poizot, P
    Tarascon, JM
    Masquelier, C
    [J]. NATURE MATERIALS, 2005, 4 (03) : 254 - 260
  • [9] A novel coating technology for preparation of cathodes in Li-ion batteries
    Dominko, R
    Gaberscek, M
    Drofenik, J
    Bele, M
    Pejovnik, S
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2001, 4 (11) : A187 - A190
  • [10] Unexpected substitution in the Li1-3xFexNiPO4 (0 < x < 0.15) solid solution.: Weak ferromagnetic behaviour
    Goñi, A
    Lezama, L
    Arriortua, MI
    Barberis, GE
    Rojo, T
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 2000, 10 (02) : 423 - 428