Mathematical Modeling of Limiting Discharge Rate in Lithium-Ion Battery
Date Issued
2010
Date
2010
Author(s)
Wu, Guang-Yao
Abstract
In this thesis, the limiting discharge rate of lithium-ion battery was studied via fundamental equations which included mass transfer, charge conservation, and reaction kinetics. The general model also developed through these theories.
First of all, the charge transfer reaction was uniform that the general model can be simplified. And the limiting discharge rate for 10Ah lithium-ion battery was investigated. The modeling results showed that the limiting rate occurred for four reasons: (1) the time of solid state diffusion reaches saturated (2) the lithium-ion concentration in the electrolyte is very close to zero (3) the cut off voltage is set at 2.8V (4) the discharge time or capacity reaches the limit values.
Second, the limiting discharge rate for different internal resistance was calculated by simplified model and limitations. And increasing the internal resistance decreases the limiting discharge rate.
Finally, the effects of porosity and separator thickness were studied systematically. The modeling results represented that increasing porosity resulted in increasing limiting rate and decreasing capacity. Moreover, there was an inverse relationship between separator thickness and limiting rate. Therefore, the optima porosity and separator thickness were calculated by simplified model.
Subjects
lithium-ion battery
mathematical modeling
limiting discharge rate
SDGs
Type
thesis
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