Synthesis and Characterization of Lixfepo4/C-Ppy Composite Cathode Material with Excess of Li+ Doping
Rajeev Sehrawat1, Rashmi Mittal2, Deepak Kr Tyagi3, Milan Kr Bera4, Anil Kr Sharma5
1Dr Rajeev Sehrawat*, Department of Physics, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, India.
2Dr Rashmi Mittal, Department of Physics, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, India.
3Dr Deepak Kr Tyagi, Department of Physics, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, India.
4Dr Milan Kr Bera Department of Physics, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, India.
5Dr Anil Kr Sharma Department of Physics, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, Haryana, India.
Manuscript received on November 15, 2019. | Revised Manuscript received on 20 November, 2019. | Manuscript published on December 10, 2019. | PP: 5254-5257 | Volume-9 Issue-2, December 2019. | Retrieval Number: B8010129219/2019©BEIESP | DOI: 10.35940/ijitee.B8010.129219
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: In-situ Polypyrrole (PPy) coating was performed on the surface of LixFePO4 /C (x=0.95 to 1.20) particles using iron (III) tosylate as oxidizer. The composite material LixFePO4 /C (x=0.95 to 1.20) was synthesized by two step method. FePO4 /polyaniline particles were first synthesized by chemical precipitation and were further heat treated with lithium acetate and sucrose under reduced atmosphere. XRD pattern confirms that Li+ addition to LixFePO4 has increased interplaner spacing and of the unit cell size. Impurity phase appears with x=1.15 and 1.20 which further disappears after polymer coating. After polymerization process the XRD pattern shows Li0.05FePO4 and LiFePO4 phases and both the phases have same electrochemical behavior. Morphology of the LixFePO4 /C and LixFePO4 /C-PPy was studied by using FE-SEM and it was found that particles are spherical with size range below 200nm. Transmission Electron Microscope (TEM) also confirms that LixFePO4 /C isolated particles were well encapsulated within the polymer matrix
Keywords: LixFePO4 -C Composite, Coating, Polymer, in-situ Polymerization
Scope of the Article: Composite Materials