Electrochemical properties and structure of LiFePO4/C with Co-doping in Fe-site and Li-site

Electrochemical properties and structure of LiFePO4/C with Co-doping in Fe-site and Li-site

Guanglei TianChunju Lv Meiqiang Fan Kangying Shu 

College of material science and engineering, China Jiliang University, Hangzhou 310018, Zhejiang, P. R. China

Corresponding Author Email: 
tianguanglei@gmail.com
Page: 
269-272
|
DOI: 
https://doi.org/10.14447/jnmes.v16i4.152
Received: 
5 March 2013
|
Accepted: 
25 September 2013
|
Published: 
4 October 2013
| Citation
Abstract: 

LiFePO4/C compounds of co-doping in Li-site and Fe-site were synthesized with traditional solid state reaction. The electro- chemical and physical properties of these samples were characterized by XRD, SEM and EA. The substitution in Li-site and Fe-site led to the modifications of the structure and electrochemical performance such as initial capacity, capacity fading and polarization. The lattice constants and electrochemical performance of Sr-doped sample were larger and poorer than these of other doping samples. The co-doping samples with 1% M (Mo6+ and Nd5+) and 3% Mn2+ exhibited excellent electrochemical performance, especially in high rate. Moreover, the co-doping samples with 6% Mn2+ exhibited mild capacity fading. From these results, it was suggested that the appropriate co-doping in Li- site and Fe-site could improve both electronic and ionic conductivities of LiFePO4, which may pose to some modifications of its electro- chemical performance.

Keywords: 

LiFePO4; Co-doping; Microstructure; X-ray techniques

1. Introduction
2. Experimental
3. Results and Discussion
4. Conclusion
5. Acknowledgements
  References

[1] A.K. Padhi, K.S. Nanjundaswamy, J.B. Goodenough, J. Elec- trochem. Soc., 144, 1188 (1997).

[2] H.C. Shin, W.I. Cho, H. Jang, J. Power Sources, 159, 1383 (2006).

[3] A.D. Spong, G. Vitins J.R. Owen, J. Electrochem. Soc., 152, A2376 (2005).

[4] P.S. Herle, B. Ellis, N. Coombs, L.F. Nazar, Nat. Mater., 3, 147 (2004).

[5] Y. Wang, Y. Wang, E. Hosono, K. Wang, H. Zhou, Angew. Chem. Int. Ed., 47, 7461 (2008).

[6]  S. Lim, C.S. Yoon, J. Cho, Chem. Mater., 20, 4560 (2008).

[7] S. Ju, H. Peng, G. Li , K. Chen, Mater. Lett., 74, 22 (2012).

[8] G. Kobayashi, S. Nishimura, M. Park, R. Kanno, M. Yashima, T. Ida, A. Yamada, Adv. Funct. Mater., 19, 395 (2009).

[9] S.Y. Chung, J.T. Bloking, Y.M. Chiang, Nat. Mater., 1, 123 (2002).

[10] J. Hong, C. Wang, U. Kasavajjula, J. Power Sources, 162, 1289 (2006).

[11] G.X. Wang, S.L. Bewlay, K. Konstantinov, H.K. Liu, S.X. Dou, J.-H. Ahn, Electrochim. Acta, 50, 443 (2004).

[12] G.X. Wang, S. Bewlay, J. Yao, J.H. Ahn, S.X. Dou, H.K. Liu, Electrochem. Solid-State Lett., 7, A503 (2004).

[13] C.W. Kim, J.S. Park, K.S. Lee, J. Power Sources, 163, 144 (2006).

[14] G. Arnold, J. Garche, R. Hemmer, S. Strobele, C. Vogler, M. Wohlfahrt-Mehrens, J. Power Sources, 119, 247 (2003).

[15] J. Ni, Y. Kawabe, M. Morishita, M. Watada, T. Sakai, J. Power Sources, 196, 8104 (2011).

[16] A. Yamada, M. Tanaka, K. Tanaka, K. Sekai, J. Power Sources, 81, 73 (1999).