Identification of surface impurities on LiFePO4 particles prepared by a hydrothermal process

被引:72
作者
Dokko, K [1 ]
Shiraishi, K
Kanamura, K
机构
[1] Tokyo Metropolitan Univ, Grad Sch Engn, Dept Appl Chem, Hachioji, Tokyo 1920397, Japan
[2] Japan Sci & Technol Agcy, CREST, Kawaguchi, Saitama 3320012, Japan
关键词
D O I
10.1149/1.2051987
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
LiFePO4 was synthesized by a hydrothermal process at 170 degrees C. The particle size of the LiFePO4 was 0.5 mu m. The hydrothermally synthesized LiFePO4 exhibited a discharge capacity of 65 mAh g(-1) at the potential of 3.5 V vs Li/Li+. Transmission electron microscopy revealed the formation of an amorphous layer on the LiFePO4 particle during the hydrothermal process. This amorphous layer was crystallized by a heat-treatment at 400 degrees C in an argon atmosphere. The alpha-Fe2O3 was generated on the particle surface during the annealing process. Two plateaus at 3.5 and 2.5 V were observed in discharge curve for the annealed LiFePO4. The plateau at 2.5 V was correlated with Li+-ion insertion into alpha-Fe2O3. Addition of ascorbic acid as a reducing agent to the precursor was useful in prohibiting the conversion of Fe2+ to Fe3+ during the hydrothermal process and the generation of alpha-Fe2O3 during the annealing process. It was found that a trace amount of carbonaceous material was formed on the LiFePO4 particle due to the decomposition of ascorbic acid. The hydrothermally synthesized LiFePO4 followed by annealing at 400 degrees C exhibited a discharge capacity of 150 mAh g(-1). (c) 2005 The Electrochemical Society.
引用
收藏
页码:A2199 / A2202
页数:4
相关论文
共 26 条
  • [1] Raman and FTIR spectroscopic study of LixFePO4 (0 ≤ x ≤ 1)
    Burba, CM
    Frech, R
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (07) : A1032 - A1038
  • [2] Reducing carbon in LiFePO4/C composite electrodes to maximize specific energy, volumetric energy, and tap density
    Chen, ZH
    Dahn, JR
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2002, 149 (09) : A1184 - A1189
  • [3] Electronically conductive phospho-olivines as lithium storage electrodes
    Chung, SY
    Bloking, JT
    Chiang, YM
    [J]. NATURE MATERIALS, 2002, 1 (02) : 123 - 128
  • [4] 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
  • [5] THERMAL-STABILITY OF LIXCOO2, LIXNIO2 AND LAMBDA-MNO2 AND CONSEQUENCES FOR THE SAFETY OF LI-ION CELLS
    DAHN, JR
    FULLER, EW
    OBROVAC, M
    VONSACKEN, U
    [J]. SOLID STATE IONICS, 1994, 69 (3-4) : 265 - 270
  • [6] Electrochemical performance of sol-gel synthesized LiFePO4 in lithium batteries
    Hu, YQ
    Doeff, MM
    Kostecki, R
    Fiñones, R
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2004, 151 (08) : A1279 - A1285
  • [7] 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
  • [8] Kinoshita Kim., 1988, CARBON ELECTROCHEMIC
  • [9] Effect of particle size on lithium intercalation into α-Fe2O3
    Larcher, D
    Masquelier, C
    Bonnin, D
    Chabre, Y
    Masson, V
    Leriche, JB
    Tarascon, JM
    [J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY, 2003, 150 (01) : A133 - A139
  • [10] A comparison of the electrode/electrolyte reaction at elevated temperatures for various Li-ion battery cathodes
    MacNeil, DD
    Lu, ZH
    Chen, ZH
    Dahn, JR
    [J]. JOURNAL OF POWER SOURCES, 2002, 108 (1-2) : 8 - 14