Method, device and equipment for determining ion diffusion coefficient in lithium ion battery
A lithium-ion battery, ion diffusion technology, applied in measurement devices, diffusion analysis, instruments, etc., can solve the problems of inaccurate results, inaccurate ion diffusion coefficients, inapplicable spherical assumptions, etc., and achieve accurate experimental results, ion diffusion coefficients. accurate effect
Active Publication Date: 2021-11-26
TSINGHUA UNIV
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Problems solved by technology
[0004] However, the spherical assumption is more suitable for most positive electrode materials, but the actual shape of most negative electrode materials is a lamellar structure, which is not suitable for the spherical assumption
Therefore, for non-spherical lithium-ion battery granular materials, the measured ion diffusion coefficient is inaccurate using the scheme in the traditional technology
Lead to inaccurate results of battery experiment simulation using the ion diffusion coefficient obtained by traditional technology
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[0050] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the application are given in the drawings. However, the present application can be embodied in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of this application more thorough and comprehensive.
[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs. The terms used herein in the specification of the application are only for the purpose of describing specific embodiments, and are not intended to limit the application.
[0052] It can be understood that the terms "first", "second" and the like used in this application may be...
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The invention relates to a method and device for determining an ion diffusion coefficient in a lithium ion battery, equipment and a medium. The method comprises the following steps: acquiring an electrical curve and a microscopic image of a particle sample of the lithium ion battery; constructing a geometric model of the particle sample according to the microscopic image of the particle sample; obtaining a control equation of lithium ion battery particles; based on the geometric model of the particle sample, determining a model electrical curve in a control equation of different ion diffusion coefficients; and taking the ion diffusion coefficient corresponding to the model electrical curve with the highest similarity with the electrical curve as the ion diffusion coefficient of the particle sample. By using the method, the geometric model can be constructed based on the actual shape of the particle sample, and compared with a spherical hypothesis in the traditional technology, the determined ion diffusion coefficient is more accurate, so that a technician can obtain a more accurate experiment result when performing a simulation experiment by using the ion diffusion coefficient.
Description
technical field [0001] The present application relates to the technical field of lithium-ion battery material measurement, in particular to a method, device and equipment for determining ion diffusion coefficients in lithium-ion batteries. Background technique [0002] With the development of new energy technology, lithium-ion batteries have become the most suitable power source for electric vehicles due to their advantages of high energy density, long cycle life, low self-discharge rate and no memory effect. The ion diffusion coefficient of the active particles of the lithium-ion battery is an important kinetic parameter that determines the performance of the lithium-ion battery. Therefore, in order to simulate the lithium-ion battery or design a more reasonable battery electrode structure, it is necessary to measure the lithium-ion battery The ion diffusion coefficient of the granular material. [0003] In traditional technology, it is assumed that the particle material o...
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IPC IPC(8): G01N13/04
CPCG01N13/04G01N2013/003
Inventor 李哲方儒卿
Owner TSINGHUA UNIV