|
|
|
| The effect on electrochemical performance of LiFePO4 by different doping |
| KANG Xiaoxue1; TIAN Yanwen1; SHAO Zhongbao2; YUAN Wansong1 |
1.School of Materials and Metallurgy; Northeastern University; Shenyang 110004
2.School of Science; Northeastern University; Shenyang 110004 |
|
Cite this article:
KANG Xiaoxue TIAN Yanwen SHAO Zhongbao YUAN Wansong. The effect on electrochemical performance of LiFePO4 by different doping. Chin J Mater Res, 2009, 23(6): 646-651.
|
|
|
Abstract LiFe 0.95 M 0.05 PO 4 (M=Mg, Ni, Co) were synthesized by hydrothermal process with Fe-site doping in liquid phase. The samples of LiFe0.95 M 0.05 PO 4 were characterized by XRD, FTIR and SEM methods. The effect of Fe-site doping on electrochemical properties of the samples was investigated. The results show that the electrochemical capacity and cyclic stability of LiFe 0.95 M 0.05 PO 4 at 1C are enhanced. Under 1C rate, the first discharge capacity of LiFe 0.95 Mg 0.05 PO 4, LiFe 0.95 Ni 0.05 PO 4 and LiFe 0.95 Co 0.05 PO 4 exhibit 133.1 mAh·g−1, 128.4 mAh·g−1 and 135.2 mAh·g−1, respectively. In three doping ions, the result of Co 2+ doping is the best. The capacity fading rates of LiFe 0.95 Co 0.05 PO 4 are 5.7% at 0.1C and 9.5% at 1C after 30 cycles. Such a significant improvement of electrochemical performance at 1C rate should be related to the enhancement of the reversibility and conductivity of LiFePO4 doped by bivalent cation
in Fe-site.
|
|
Received: 31 May 2009
|
|
|
| Fund: Supported by the Liaoning Science and Technology Key Project No.2005224016. |
| 1 A.K.Padhi, K.S.Nanjundaswamy, J.B.Goodenough, Phospho-olivines as positive-electrode materials for rechargeable lithium batteries, Journal of the Electrochemical Society, 144(4), 1188-1194(1997)
2 M.Takahashi, S.Tobishima, K.Takei, Y.Sakurai, Reaction behavior of LiFePO4 as a cathode material for rechargeable lithium batteries, Solid State Ionics, 148(3-4), 283-289(2002)
3 H.Huang, S.C.Yin, L.F.Nazar, Approaching theoretical capacity of LiFePO4 at room temperature at high rates, Electrochemical and Solid State Letters, 4(10), A170- A172(2001)
4 F.Croce, A.D.Epifanio, J.Hassoun, A.Deptula, T.Olczac, B.Scrosati, A novel concept for the synthesis of an improved LiFePO4 lithium battery cathode, Electrochemical and Solid State Letters, 5(3), A47-A50(2002)
5 Z.Wang, S.Su, C.Yu, Y.Chen, D.Xia, Synthesises, characterizations and electrochemical properties of sphericallike LiFePO4 by hydrothermal method, Journal of Power Sources, 184(2), 633-636(2008)
6 S.Y.Chung, J.T.Bloking, Y.M.Chiang, Electronically conductive phospho-olivines as lithium storage electrodes, Nature Materials, 1(2), 123-128(2002)
7 J.Barker, M.Y.Saidi, J.L.Swoyer, Lithium iron(II) phospho-olivines prepared by a novel carbothermal reduction method, Electrochemical and Solid State Letters, 6(3), A53-A55(2003)
8 K.Dokko, S.Koizumi, K.Sharaishi, K.Kanamura, Electrochemical properties of LiFePO4 prepared via hydrothermal route, Journal of Power Sources, 165(2), 656-659(2007)
9 E.M.Jin, B.Jin, D.K.Jun, K.H.Park, H.B.Gu, K.W.Kim, A study on the electrochemical characteristics of LiFePO4 cathode for lithium polymer batteries by hydrothermal method, Journal of Power Sources, 178(2), 801-806(2008)
10 C.M.Burba, R.Frech, Raman and FTIR spectroscopic study of LixFePO4 (0 x 1), Journal of the Electrochemical Society, 151(7), A1032-A1038(2004)
11 A.Yamada, S.C.Chung, K.Hinokuma, Optimized LiFePO4 for lithium battery cathodes, Journal of the Electrochemical Society, 148(3), A224-A229(2001)
12 D.Y.W.Yu, C.Fietzek, W.Weydanz, K.Donoue, T.Inoue, H.Kurokawa, S.Fujitani, Study of LiFePO4 by cyclic voltammetry, Journal of the Electrochemical Society, 154(4), A253-A257(2007) |
| No Suggested Reading articles found! |
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
Cited |
|
|
|
|
| |
Shared |
|
|
|
|
| |
Discussed |
|
|
|
|
