Morphological investigation of sub-micron FePO4 and LiFePO4 particles for rechargeable lithium batteries

被引:62
作者
Scaccia, S
Carewska, M
Wisniewski, P
Prosini, PP
机构
[1] ENEA, IDROCOMB, I-00060 Rome, Italy
[2] Warsaw Univ Technol, Fac Chem, Warsaw, Poland
关键词
amorphous materials; chemical synthesis; electron microscopy; microstructure;
D O I
10.1016/S0025-5408(03)00110-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Microstructural variations of amorphous FePO4 and LiFePO4 (the latter obtained by chemical lithiation of the former) as a result of the annealing temperature have been studied by Thermogravimetric Analysis (TGA)/Differential Thermal Analysis (DTA), chemical analysis, Brunauer-Emmet-Taylor (BET) and Scanning Electron Microscopy (SEM) techniques. Round-shaped amorphous FePO4 particles 40-80 nm in size are obtained after heating (at 400 degreesC) amorphous FePO4.2H(2)O in air (previously prepared by a precipitation route). On further heating at 650 degreesC, in air, crystalline trigonal FePO4 of crystallite size <200 nm is formed. Round-shaped amorphous LiFePO4 particles 40-80 nm in size crystallize by heating at 550 degreesC in Ar + 5%H-2 for 3 h. After thermal treatment, LiFePO4 particles are interconnected by necks, which resembled a sintering process. The particle size of LiFePO4 increases with an increase of temperature up to 750 degreesC, but an abnormal growth is evident at annealing temperatures above 650 degreesC. DTA analysis showed two exothermic peaks at 547 and 768 degreesC for FePO4 due to phase transitions, whereas for LiFePO4 two exothermic effects at 496 and 567 degreesC are shown. (C) 2003 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1155 / 1163
页数:9
相关论文
共 13 条
  • [1] ALLEN T, 1997, PARTICLE SIZE MEASUR, V2, P79
  • [2] LiFePO4 synthesis routes for enhanced electrochemical performance
    Franger, S
    Le Cras, F
    Bourbon, C
    Rouault, H
    [J]. ELECTROCHEMICAL AND SOLID STATE LETTERS, 2002, 5 (10) : A231 - A233
  • [3] Amorphous FePO4 as 3 V cathode material for lithium secondary batteries
    Hong, YS
    Ryu, KS
    Park, YJ
    Kim, MG
    Lee, JM
    Chang, SH
    [J]. JOURNAL OF MATERIALS CHEMISTRY, 2002, 12 (06) : 1870 - 1874
  • [4] 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
  • [5] Hydrated iron phosphates FePO4•nH2O and Fe4(P2O7)3•nH2O as 3 V positive electrodes in rechargeable lithium batteries
    Masquelier, C
    Reale, P
    Wurm, C
    Morcrette, M
    Dupont, L
    Larcher, D
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (08) : A1037 - A1044
  • [6] PADHI AK, 1997, J ELECTROCHEM SOC, V144, P1189
  • [7] A new synthetic route for preparing LiFePO4 with enhanced electrochemical performance
    Prosini, PP
    Carewska, M
    Scaccia, S
    Wisniewski, P
    Passerini, S
    Pasquali, M
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (07) : A886 - A890
  • [8] Synthesis and characterization of amorphous hydrated FePO4 and its electrode performance in lithium batteries
    Prosini, PP
    Lisi, M
    Scaccia, S
    Carewska, M
    Cardellini, F
    Pasquali, M
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (03) : A297 - A301
  • [9] Solution processing approaches for solid electrolytes and electrode materials
    Simner, SP
    Wu, PW
    Dunn, B
    [J]. JOURNAL OF MATERIALS RESEARCH, 1998, 13 (04) : 866 - 874
  • [10] Temperature-dependent properties of FePO4 cathode materials
    Song, YN
    Yang, SF
    Zavalij, PY
    Whittingham, MS
    [J]. MATERIALS RESEARCH BULLETIN, 2002, 37 (07) : 1249 - 1257