Abstract
Lithium iron phosphate (LiFePO4) is a cathode material for the rechargeable-lithium batteries. In this paper is presented a novel method of fabrication carbon-coated LiFePO4 in a pilot reactor built according to the principles of the thermo-acoustic burner of Helmholtz-type. Crystalline powder with a high percentage of LiFePO4 was synthesized by incomplete combustion, i.e. in the reductive atmosphere, and calcined at 700?C for 6 h. The obtained samples were characterized by X-ray diffraction, IR and Raman spectroscopy. The aim of this study was to demonstrate the production of the high-quality lithium-ion cathode material by the incomplete combustion. The synthesis of LiFePO4 is completed during calcination and an ordered structure is attained. Fast synthesis in the reactor (less than 2 s) is achieved due to the reduction in the size of reactant's particles and a huge number of collisions owing to their strong turbulent flow associated with explosive combustion.
Highlights
Battery technology is a core technology for all future generation clean energy vehicles such as fuel cell vehicles, electric vehicles, and plug-in hybrid vehicles. Augmentation of this superior battery technology is essential for deployment of the same in different applications ranging from hybrid electric vehicles to consumer electronics
The pulse combustion reactor that was used for the synthesis LiFePO4 is presented in Ref. [19]
Obtained diffractogram is compared with the data from the Powder Diffraction Files: PDF-2 83-2092 for lithium iron phosphate
Summary
Battery technology is a core technology for all future generation clean energy vehicles such as fuel cell vehicles, electric vehicles, and plug-in hybrid vehicles Augmentation of this superior battery technology is essential for deployment of the same in different applications ranging from hybrid electric vehicles to consumer electronics. The LiFePO4 crystallizes in the orthorhombic system (No 62) with Pnma space group It consists of a distorted hexagonal-close-packed (hcp) oxygen network forming 16 octahedral and 32 tetrahedral sites. The metal atoms can be viewed as occupying bc metal planes, where the planes are alternatively occupied by each type of metal, i.e., there is a Li-Fe-Li-Fe ordering along the a-axis It makes possible the two-dimensional Li diffusion between the hcp-oxygen layers [16, 17], but b-axis is privileged. The obtained olivine LiFePO4 was characterized using XRD, Raman and IR spectroscopy
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