Effect of high current pulse discharge on lithium iron phosphate battery II

- Nov 05, 2016 -

Recently, the N. Wong Derek of The University of Texas at Arlington has carried out a research on the effect of large current pulse discharge on the performance of lithium iron phosphate. N. Wong Derek uses the lithium iron phosphate 26650 cell to study the effect of 40A pulse current on the battery performance, in order to simulate the real working scene of the use of Li ion batteries in electric vehicles. The study found that the high rate discharge resistance of lithium iron phosphate battery increased dramatically, a large number of LiPF6 produced by the decomposition of LiF was found on the surface of the negative electrode, the serious influence on the diffusion kinetics characteristics of interface, which is mainly caused by high current pulsed discharge of lithium iron phosphate battery capacity degradation. N. Wong Derek studied the decay mechanism of the lithium iron phosphate battery, which is the most up to 15C in the continuous and pulsed two ways, and once every 20 times to carry out a 1C cycle in order to measure its capacity. The study found that, when the 15C pulse charging and discharging, the battery can not be carried out after 40 cycles of 15C charging, but still able to carry out the charge discharge of 1C, its 1C capacity decline rate of 6%/20 times. The 15C continuous charging and discharging of the battery, 60 times after the still can continue to charge and discharge 15C power, but its 1C capacity decline rate is significantly higher than the pulse mode, to achieve the 14%/20 cycle.

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