Numerical simulation of lithium-ion battery with LiFePO4 as cathode material: effect of particle size

被引：0
|
作者：
Xu Y. [1 ]
Chen Y. [1 ]
Zhou J. [1 ]
Sui Z. [1 ]
Zhou X. [1 ]
机构：
[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai
来源：
Huagong Xuebao/CIESC Journal | 2020年 / 71卷 / 02期
关键词：
Lithium iron phosphate; Lithium-ion battery; Mathematical modeling; Particle size; Rate performance;
D O I：
10.11949/0438-1157.20191199
中图分类号：
学科分类号：
摘要：
When LiFePO4 (LFP) is used as a cathode material, the lithium-ion battery has high safety and long cycle life. It is currently the most widely used cathode material, but its battery rate performance is poor. One of the effective means to improve the rate performance of lithium-ion battery is to use LFP material of nanometer size. However, the mechanism of the LFP particle of nano size affecting the eletrochemical process during the charge and discharge of lithium-ion battery still remain unclear. In this work, a quasi-two-dimensional model of lithium-ion battery was established to simulate the discharge process. The influence of LFP particle size on the rate performance of lithium-ion battery was quantitatively studied. The diffusion rate and electrochemical reaction rate at solid-liquid interface were quantitatively analyzed. The results indicate that the resistance in solid phase is the key factor limiting the performance of lithium-ion battery. In the case of small particle LFP as electrode material, the diffusion path of lithium metal within the particles was shortened and the interface between electrode material and electrolyte increased, thus the electrochemical reaction rate was faster, presenting better rate performance. While in the case of large particle LFP as electrode material, the low solid phase diffusion rate of LFP material resulted in low electrochemical reaction rate and thus deteriorate rate performance of the lithium-ion battery. Size reduction of LFP could effectively shorten the migration path of the metal lithium in the electrode material and reduce solid phase diffusion resistance, therefore enhance the rate performance of the lithium-ion battery. © All Right Reserved.
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页码：821 / 830
页数：9
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