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A method for evaluating quality of cathode materials in Lithium-ion ba…

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작성자 한국입자분석연구소 댓글 0건 조회 18회 작성일 25-03-17 16:52

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A method for evaluating quality of cathode materials in

Lithium-ion batteries through automated electron microscopy


 

 

Yong-kyu Ko1*, Dong-hyun Kim1, James Yoon2, Steven Lee2, Ji-hyeon Son2

 1충북대학교 물리학과 연구장비개발 Research equipment development, Department of Physics, Chungbuk National University

 2()한국입자분석연구소 Application LAB, PKoLAB.,LLC


I. Introduction

 

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▪ In the case of NCM (Ni, Co, Mn) cathode material most commonly used in industry, it shows different characteristics depending on the composition ratio of Co, Ni and Mn. However, various problems arise as the component content changes. The task of minimizing the occurrence of defects by strengthening thorough quality control as a matter of stability remains an important task.


 

In general, studies have been conducted with a general electron microscope (SEM-EDS) to observe the ICP or component state that can be analyzed in the PPM unit for whether foreign matter is included, but in this case, only local areas that cannot represent the entire material are observed. This is possible and there are limitations to image analysis in the case of ICP. To compensate for these limitations, an electron microscope (Thermo Fisher Scientific model : Phenom ParticleX battery) suitable for automatically analyzing large-area particles was used. In this study, an efficient analysis method of battery materials is introduced by presenting a new observation method for quality inspection after mass production through the developed analysis method.



II. Experimental details

1. Sample preparation

59a653c6326e88ca3e10945b1e079052_1737686434_3529.png

Figure | Particle Dispersion Using Vacuum. (Particle dispenser model : Nebula, Vacuum state: 5x10-2torr). 


2. Measurement & Workflow

01d0fcab4b6038c0c1e1ee18c6f90b76_1737693009_1035.png

Figure | Automated Feature Analysis Workflow (Montage, Threshold, Classification rules).


3. Analysis conditions


Sample

NCM 811

Duration (Running Time)

13h 2min

Area scanned

78.99mm2

Number of Stage fields

246

Particle counts

781,314

Classification rules

ISO 16232

(NCM version)

SEM Magnification

x300


Table | Sample analysis conditions.



III. Results and Discussions

a) Stage map


01d0fcab4b6038c0c1e1ee18c6f90b76_1737696699_2671.png

Figure | Whole Picture of NCM powder (Total field : 246, BSE image).



b) Total Particle Results

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Figure | Particle size distribution and Geometry data by classification (Dmax, ECD, Aspect ratio, Area).


c) Total Chemistry Results

01d0fcab4b6038c0c1e1ee18c6f90b76_1737697589_1175.png


Figure | Total Particle Elements Distribution ratio.



d) Morphology

06a7215d59bedb8bdfad7ed80a6761d3_1742197768_1125.png

Figure | Morphology of Particle (formation of 781,314 of all particle observed).


e) Ternary phase diagram

06a7215d59bedb8bdfad7ed80a6761d3_1742197816_7955.png

Figure | Ternary phase diagram (Ni, Co, Mn / Cr, Fe, Ni).



f) Plant Monitor

06a7215d59bedb8bdfad7ed80a6761d3_1742197829_6451.png

Figure | Plant Monitor (Quality Issue & Event check through plant monitor).