Shorting Effects of LiFePO4 Cathode in Lithium Ion Batteries
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Co3(PO4)2 or AlPO4 coating layers were formed on the surface of LiNi0.8Co0.15Al0.05O2cathode material by in situ chemical method and calcination at 700°C to improve the electrochemical cyclability and structural stability during charge-discharge process of the cathode. The structure and electrochemical properties of the pristine LiNi0.8Co0.15Al0.05O2 cathode materials and the metal phosphate coated-cathode materials were investigated by X-ray powder diffraction, scanning electron microscopy, particle size analysis, Brunauer-Emmett-Teller method, cyclic voltammetry, and galvanostatic charge-discharge test. Co3(PO4)2-LiNi0.8Co0.15Al0.05O2 and AlPO4- LiNi0.8Co0.15Al0.05O2 cathode showed the improved reversibility compared with the pristine cathode material. It is attributed to the structural stability of metal phosphate coated LiNi0.8Co0.15Al0.05O2. In particular, Co3(PO4)2-LiNi0.8Co0.15Al0.05O2 showed a more stable rate capability than the pristine LiNi0.8Co0.15Al0.05O2 and AlPO4-LiNi0.8Co0.15Al0.05O2 at high C-rate.
lithium ion batteries, LiFePO4, shorting, charging, discharging
[1] J.M. Tarascon, M. Armand, Nature, 414, 359 (2001).
[2] M. Armand, J.M. Tarascon, Nature, 451, 652 (2008).
[3] A.K. Padhi, K.S. Nanjundaswamy and J.B. Goodenough, J. Electrochem. Soc., 144, 1188 (1997).
[4] S.Y. Chung, J.T. Bloking, Y.M. Chiang, Nature Materials, 1, 123 (2002).
[5] B. Ellis, W.H. Kan, W.R.M. Makahnouk and L.F. Nazar, J. Mater. Chem., 17, 3248 (2007).
[6] B. Kang, G. Ceder, Nature, 458, 190 (2009).
[7] S. Yang, P.Y. Zavalij and M.S. Whittingham, Electrochem. Commun., 3, 505 (2001).
[8] S. Yang, Y. Song, P.Y. Zavalij and M.S. Whittingham, Electrochem. Commun., 4, 239 (2002).
[9] S. Franger, F. Le Cras, C. Bourbon and H. Rouault, J. Power Sources, 252, 119 (2003).
[10] N.C.Y. Ravet, M.J. Fagnan, S. Besner, M. Gauthier &M. Armand, J. Power Sources, 97, 503 (2001).
[11] P.S. Herle, B. Ellis, N. Coombs and L.F. Nazar, Nat. Mater., 3, 147 (2004).
[12] H. Huang, S.-C. Yin and L.F. Nazar, Electrochem. Solid-State Lett., 4, A170 (2001).
[13] R. Dominiko, M. Bele, M. Gaberscek, M. Remskar, S. Pejovnik and J. Jamnik, J. Electrochem. Soc., 152, A607 (2005).
[14] A. Yamada, S.C. Chung and K. Hinokuma, J. Electrochem. Soc., 148, A224 (2001).
[15] M.S. Islam, D.J. Driscoll, C.A.J. Fisher and P.R. Slater, Chem. Mater., 17, 5085 (2005).
[16] J. Chen and M.S. Whittingham, Electrochem. Commun., 8, 855 (2006).
[17] D. Morgan, A. Van der Ven & G. Ceder, Electrochem. Solid State Lett., 7, A30 (2004).
[18] C. Delacourt, P. Poizot, S. Levasseur and C. Masquelier, Electrochem. Solid State Lett., 9, A352 (2006).
[19] D.H. Kim and J. Kim, Electrochem. Solid State Lett., 9, A439 (2006).