High Energy Density Large Particle LiFePO4Click to copy article linkArticle link copied!
- Moarij A. SyedMoarij A. SyedDepartment of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2, CanadaMore by Moarij A. Syed
- M. SalehabadiM. SalehabadiDepartment of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2, CanadaMore by M. Salehabadi
- M. N. Obrovac*M. N. Obrovac*Email [email protected]Department of Chemistry, Dalhousie University, Halifax, N.S. B3H 4R2, CanadaDepartment of Physics and Atmospheric Science, Dalhousie University, Halifax, N.S. B3H 4R2, CanadaMore by M. N. Obrovac
Abstract
To improve the energy density of LiFePO4 (LFP) cathode materials for Li-ion cells, we have utilized a modified mechanofusion method for preparing micrometer-sized LFP/C composite flake particles. The resulting flake particle morphology resulted in improved packing efficiency, enabling an electrode porosity of 14% to be achieved at high loadings, which represents a volumetric energy density increase of 28% compared to conventional LFP. Furthermore, LFP/C flake composites electrodes were found to have a higher coulombic efficiency, a reduced voltage–polarization, and a greatly reduced charge transfer resistance compared to conventional LFP electrodes. This is believed to be due to the low surface area of the LFP/C flake composite particles coupled to fast Li+ ion grain boundary diffusion. The ability to make highly dense LFP and low surface area electrodes could have profound impacts, allowing for Li-ion cells to be made with low cost and low environmental impact LFP, while high achieving volumetric energy densities and high coulombic efficiencies.
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