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The development of the impedance spectroscopy method to measure the particle dispersion degree in Lithium-ion battery (LIB) slurry

阻抗谱法测定锂离子电池（LIB）浆料颗粒分散度的研究进展

基本信息

批准号：
17J03249
负责人：
王志龍
金额：
$ 1.22万
依托单位：
Chiba University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2017
资助国家：
日本
起止时间：
2017-04-26 至 2019-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17J03249/
关键词：
Particle dispersion dielectric cathode slurry circle fitting method equivalent circuit LIB slurry EIS EEC

项目摘要

I combined both experiment and simulation methods to clarify the dielectric characteristics of LIB slurry. In the experiment, three slurries are extracted from cathode slurry. Meanwhile, cathode slurry is stirred at different rotational speeds. In the simulation, three different models are compared with the experimental slurries. The medium conductivity and particle conductivity are changed. The obtained Nyquist plots are fitted by circle fitting method. The characteristic resistances fitted by the circle fitting method are compared with those fitted by EEC. Meanwhile, the relaxation frequencies fitted by using the circle fitting method are quantitatively compared with those of experiment. Three main conclusions are shown as follows. Firstly, two particle dispersion behaviours which are CB aggregation and CB-bare LiCoO2 particles are able to be obtained in the case of lower n, while another two particle dispersion behaviours which are CB path and CB-coated LiCoO2 particles are able to be obtained in the case of higher n. In dielectric simulation, CB aggregation and CB-bare LiCoO2 particles are verified by lower medium conductivity and lower particle conductivity. CB path and CB-coated LiCoO2 particles are verefied;ed by higher medium conductivity and higher particle conductivity, respectively. However, compared with particle conductivity, medium conductivity plays important roles in determining particle dispersion because medium conductivity has the similar functions as n. Hence, CB path dominates the conductivity of cathode slurry than CB-coated LiCoO2 particles.

结合实验和模拟的方法来阐明锂离子电池浆料的介电特性。在实验中，从阴极浆料中提取三种浆料。同时，以不同的旋转速度搅拌阴极浆料。在模拟中，三种不同的模型与实验浆料进行了比较。介质电导率和颗粒电导率发生变化。用圆拟合法对得到的Nyquist曲线进行了拟合。将圆拟合法拟合的特性电阻与EEC法拟合的特性电阻进行了比较。同时，将圆拟合法拟合的弛豫频率与实验结果进行了定量比较。主要结论如下。首先，在较低的n值下，可以得到两种颗粒分散行为，即CB聚集和CB裸露的LiCoO2颗粒，而在较高的n值下，可以得到另外两种颗粒分散行为，即CB路径和CB包覆的LiCoO2颗粒。在介电模拟中，CB聚集和CB裸露的LiCoO2颗粒通过较低的介质电导率和较低的颗粒电导率来验证。CB路径和CB包覆LiCoO2颗粒分别通过较高的介质电导率和较高的颗粒电导率来艾德。然而，与颗粒电导率相比，介质电导率在决定颗粒弥散方面起着重要作用，因为介质电导率具有与n相似的函数。因此，CB路径比CB涂覆的LiCoO2颗粒主导阴极浆料的导电性。