Modification of LiFePo4 by Citric Acid Coating and Nb5+ Doping

摘要:

文章预览

In order to improve the electrochemical performance of LiFePO4, Li0.99Nb0.01FePO4/C composite materials were synthesized with citric acid coating and Nb2O5 doping. The physical chemistry and electrochemical performances of Li0.99Nb0.01FePO4/C were investigated by X-Ray diffraction (XRD) and Transmission electron microscope (TEM). The results show that Li0.99Nb0.01FePO4/C has smooth charge-discharge voltage platform, with first capacity of 151.6 mAh•g-1 (0.1C) and no obvious capacity fading after 16 cycles. The materials have favorable high rate discharge performances, with the first capacity of 131.6 mAh•g-1 at 0.5C, 119.8 mAh•g-1 at 1.0C and 106.2 mAh•g-1 at 2.0C. Equivalent circuits analysis shows that the impedance, especially electrode reaction resistance of Li0.99Nb0.01FePO4/C are significantly reduced compared with the pure LiFePO4 and this helps to improve the electric conductivity, discharge capacity and cycle performance. The diffusion coefficient of Li+ in Li0.99Nb0.01FePO4/C is 2.51×10-12 cm2•s-1 increased two orders of magnitude in comparison with the pure LiFePO4. Carbon-coating makes a more remarkable contribution to lithium diffusion than Nb5+ ion doping.

信息:

期刊:

编辑:

Xianjun Lu and Jun Qiu

页数:

167-173

DOI:

10.4028/www.scientific.net/AMR.158.167

引用:

D. Y. Zhang et al., "Modification of LiFePo4 by Citric Acid Coating and Nb5+ Doping", Advanced Materials Research, Vol. 158, pp. 167-173, 2011

上线时间:

November 2010

输出:

价格:

$35.00

[1] J. Li, W. Yao, S. Martin and D. Vaknin: Solid State Ionics Vol. 179 (2008), p.2016-(2019).

[2] Z. Tang, D. Guan and N. Zhang: Chemical Industry and Engineering Progress Vol. 24 (2005), pp.1098-1102.

[3] D.H. Kim and J. Kim: Electrochem. Solid-State Lett. Vol. 9 (2006), p. A439-A442.

[4] H. Huang, S.C. Yin and L.F. Nazar: Electrochem. Solid State Lett. Vol. 4 (2001), p. A170-A172.

[5] R. Dominko, M. Bele, M. Gaberscek, M. Remskar, D. Hanzel, S. Pejovnik and J. Jamnik: J. Electrochem. Soc. Vol. 152 (2005), p. A607-A610.

DOI: 10.1149/1.1860492

[6] S. -Y. Chung, J.T. Blocking and Y. -M. Chiang: Nat. Mater. Vol. 1 (2002), pp.123-128.

[7] D.Y. Wang, H. Li, S.Q. Shi, X.J. Huang and L.Q. Chen: Electrochim. Acta Vol. 50 (2005), pp.2955-2958.

[8] Y. Wen, L. Zeng, Z. Tong, L. Nong and W. Wei: J. Alloys Compd. Vol. 416 (2006), pp.206-208.

[9] X. q. Huang, P. x. Zhang and Q. m. Xu: J. Func. Mater. Vol. 39 (2008), pp.1154-1157.

[10] P. x. Zhang, Y. x. Wen, J. h. Liu, Q. m. Xu, X. z. Ren, Q.L. Zhang and Z. k. Luo: Rare Metal Materials and Engineering Vol. 23 (2007), pp.954-958.

[11] H. Liu, Q. Cao, L.J. Fu, C. Li, Y.P. Wu and H.Q. Wu: Electrochem. Commun. Vol. 8 (2006), pp.1553-1557.

为了查看相关信息, 需 Login.