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Effects of Palladium Doping on the Structure and Electrochemical Properties of LiFePO4/C Prepared using the Sol-gel Method

Effects of Palladium Doping on the Structure and Electrochemical Properties of LiFePO₄/C Prepared using the Sol-gel Method

M. Talebi-Esfandarani | O. Savadogo^*

Laboratory of New Materials for Electrochemistry and Energy, École Polytechnque de Montréal, C.P. 6079, Succ. Centre Ville, Montréal, QC, Canada, H3C 3A7

Corresponding Author Email:

osavadogo@polymtl.ca

Received:

November 21, 2013

| |

Accepted:

January 24, 2014

| | Citation

429-article_text-696-1-10-20170726.pdf

OPEN ACCESS

Abstract:

LiFePO₄/C, LiFe_0.98Pd_0.02PO₄/C, and LiFe_0.96Pd_0.04PO₄/C composite cathode materials were synthesized using the sol-gel method. The effect of palladium on the structure and electrochemical properties of LiFePO₄/C have been investigated by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), surface area measurement (BET), charge/discharge testing, and cyclic voltammetry (CV). The results indicate that palladium doping facilitates the formation of impurities, like Li₃PO₄. Also, the lattice parameters of the LiFePO₄ structure decrease in size as the palladium content increases. In addition, the particles become larger and agglomerated by palladium incorporation. The electrochemical results show that palladium doping decreases the electrochemical performance of LiFePO₄/C, owing to shrinking lattice parameters and the difficulty of achieving the diffusion of lithium ions into the structure during the intercalation/de-intercalation process. These results suggest that palladium doping by sol-gel method changes significantly the LiFePO₄ structure which may impact it performances as cathode for the lithium ion battery applications.

Keywords:

LiFePO₄/C, sol-gel method, palladium doping, lithium ion diffusion.

1. Introduction

2. Experimental

3. Results and Discussion

4. Conclusions

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Effects of Palladium Doping on the Structure and Electrochemical Properties of LiFePO4/C Prepared using the Sol-gel Method