Abstract
An electrochemical Lithium ion battery model was built taking into account the electrochemical reactions. The polarization was divided into parts which were related to the solid phase and the electrolyte mass transport of species, and the electrochemical reactions. The influence factors on battery polarization were studied, including the active material particle radius and the electrolyte salt concentration. The results showed that diffusion polarization exist in the positive and negative electrodes, and diffusion polarization increase with the conducting of the discharge process. The physicochemical parameters of the Lithium ion battery had the huge effect on cell voltage via polarization. The simulation data show that the polarization voltage has close relationship with active material particle size, discharging rate and ambient temperature.
Highlights
The Lithium-ion battery has become one of the most widely used energy storage devices because of its high energy and power densities [1,2,3,4,5,6,7,8,9,10,11,12]
The concentration difference of Li-ion is significantly reduced when the active material particles is half of the original (26.07% reduced in negative electrode, 25.35% reduced in positive electrode)
The concentration difference of Li-ion is significantly increased when the active material particles is twice larger than the original (278.46% increased in negative electrode, 386.83% increased in positive electrode)
Summary
The Lithium-ion battery has become one of the most widely used energy storage devices because of its high energy and power densities [1,2,3,4,5,6,7,8,9,10,11,12]. Numerical simulation based on mathematical models is an effective method to study the relationship between the corresponding parameters and battery performance. Kim et al [14] presented an equivalent circuit models to represent the electrochemical properties to predict the discharging procedure The battery parameters such as the thickness of separator, the thickness of electrode and the electrolyte concentration were changed to study their influence on charging procedure. Qualitatively analysis on polarization voltage and its relationship with discharging performance by building an electrochemical model were not covered. This work would facilitate to optimizing the battery design by providing the theoretical support and shorting the development cycle It may promote a low-cost method and make a positive contribution to manufacturing Li-ion batteries for large-scale applications
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