JMP  Vol.5 No.15 , September 2014
Phosphorus Based Ceramics for Positive Electrode Synthesis and Characterization
ABSTRACT
Historically, the LiCoO2 is the most used as active material for battery positive electrode because of its great potential (3.7 - 4.2 V), its interesting specific capacity (150 mA·h·g-1) and its excellent life cycle [1]. However, its toxicity, the cobalt cost and its structural instability oriented research towards new materials more stable that can replace it. In another context, hybrid, electrical vehicles and communication (computers and mobile phones...) have increased the scientific and technological research for new materials capable of storing and return energy through a system called accumulator. And research has identified the phosphate olivine structure as the most prolific ceramic material for positive electrode. LiFePO4 is a promising cathode material for Lithium-ion batteries. It provides high thermal stability and is synthesized using low cost materials. Unfortunately LiFePO4 suffers from a low electrical conductivity, which is harmful to its electrochemical performance. Decreasing the particle size, coating the particles with carbon or doping with metal atoms can increase the conductivity of the material. In this paper, we present the synthesis, physico-chemical and electrical characterization of lithium and iron doped Al-phosphorrus-based ceramic. The NPK Fertiliser was used as Al and phosphorus precursors. The powder XRD spectrum shows a possible presence of LiFePO4 and Fe2(PO)3 in theheterostrcture. An important quantity of Al is found by EDX spectra which supposed that the most important based atom is Aluminum and not Phosphorus. This can explain the increase of the conductivity value 102 times more important than those found in the literature for LiFePO4.

Cite this paper
Kobor, D. , Diallo, A. and Tine, M. (2014) Phosphorus Based Ceramics for Positive Electrode Synthesis and Characterization. Journal of Modern Physics, 5, 1459-1466. doi: 10.4236/jmp.2014.515147.
References
[1]   Aimable, A., et al. (2006) Materiaux, 13, 1-9.

[2]   Perea, A. (2011) Les phosphates de structure olive LiMPO4 (M= Fe, Co, Mn) comme materiau actif d’electrode positive d’accumulateur Li-ion. Thesis, Universite Montpellier II, Montpellier.

[3]   Trad, K. (2010) Phosphates de fer de structures originales comme materiaux d’electrode positive pour batteries au lithium ou au sodium. Thesis, Universite de Bordeaux 1, Bordeaux.

[4]   Plancha, M.J., Rangel, C.M., Rodrigues, B. and Azevedo, F. (2010) Degradation of Lithium Iron Phosphate-Based Cathode in Lithium-Ion Batteries: A Post-Mortem Analysis. Eco community3° seminario Internacional Torres Vedas, 29-30 April 2010, Portugal.

[5]   Julien, C.M., Zaghib, K., Mauger, A. and Groult, H. (2012) Advances in Chemical Engineering and Science, 2, 321-329.
http://dx.doi.org/10.4236/aces.2012.23037

[6]   Adams, S. and Rao, R.P. (2010) Atom Indonesia, 36, 95-104.

[7]   Johannes, M.D., Hoang, K., Allen, J.L. and Gaskell, K. (2012) Physical Review B, 85, Article ID: 115106.
http://dx.doi.org/10.1103/PhysRevB.85.115106

[8]   Maccario, M. (2007) Caracterisation de nanomateriaux C-LiFePO4 optimises pour materiaux d’electrode positive pour batteries lithium-ion. Determination du mecanisme de desintercalation/intercalation du lithium a partir de ces materiaux. Thesis, Universite de Bordeaux 1, Bordeaux.

[9]   Jonscher, A.K. (1967) Nature, 267, 673-679.
http://dx.doi.org/10.1038/267673a0

[10]   Klaus, F. (2013) Science and Technology of Advanced Materials, 14, Article ID: 043502.
http://dx.doi.org/10.1088/1468-6996/14/4/043502

[11]   Sidebottom, D.L. (1999) Physical Review Letters, 83, 983-986.
http://dx.doi.org/10.1103/PhysRevLett.83.983

 
 
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