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Effects of constant magnetic field on the performance and the durability of lithium lifepo4 batteries

Author: 
Oscar GODONOU, Vincent PRODJINONTO, Jean-Louis FANNOU, IsdeenYAYA NADJO
Subject Area: 
Physical Sciences and Engineering
Abstract: 

In this work, we were interested in improving the performance and durability of LiFePO4 batteries through the application of a constant magnetic field. To do this, we defined three paramanders: kinetic efficiency and coulombic efficiency for the assessment of performance, then internal resistance for the assessment of durability. We also defined three factors: the charging or discharging rate, the magnetic field, and the state of the process. With an experimental device, we tested the IFR 26650 battery according to an appropriate experimental. design. The analysis of the various results obtained shows among that the magnetic field increases the kinetic efficiency, coulombic efficiency and decreases the internal resistance. Thus, the magnetic field improves the performance and durability of LiFePO4 batteries. A search for optimal conditions of battery use shows that, during charging, a charging rate of 0.5 C and a magnetic field of 6 mT must be established and during discharge, a discharge rate of 1 C and a magnetic field of 3 mT should be recommended. These optimal charging conditions procur average 25 % of the increasing of kinetic efficiency, 5 % of increasing of coulumbar efficiency, and 58 % of reducing of internal resistance compared to a 0.5 C charge rate in the absence of a magnetic field. About the optimal discharge conditions, they procurs average 2.6 % of increasing of kinetic efficiency, 8.4 % of increasing of coulomb efficiency, and 26 % of reducing of internal resistance compared to a 1 C discharge rate in the absence of a magnetic field.

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