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한국전기화학회 한국전기화학회

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Vol.21, No.3, August 2018

Adhesive Strength and Electrochemical Properties of Li(Ni0.5Co0.2Mn0.3)O2 Electrodes with Lean Binder Composition바인더 함량에 따른 Li(Ni0.5Co0.2Mn0.3)O2 전극의 접착력 및 전기화학 성능에 관한 연구
JKES Vol.21, No.3, pp.47-54, August 2018
DOI : 10.5229/JKES.2018.21.3.47
Youngjoon Roh1, Seoungwoo Byun1, Myung-Hyun Ryou2,**, and Yong Min Lee1,*노영준1·변승우1·유명현2,**·이용민1,*
1Department of Energy Science and Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST) 2Department of Chemical and Biological Engineering, Hanbat National University1대구경북과학기술원 에너지공학전공, 2한밭대학교 화학생명공학과
To maximize the areal capacity(mAh cm-2) of LiNi0.5Co0.2Mn0.3O2(NCM523) electrode with the same loading level of 15 mg cm-2, three NCM523 electrodes with 4, 2, and 1 wt% poly(vinylidene fluoride)(PVdF) binder content are fabricated. Due to the delamination issue of electrode composite at the edge during punching process, the 1 wt% electrode is excluded for further evaluation. When the PVdF binder content decreases from 4 to 2 wt%, both adhesion strength and shear stress decrease from 0.4846 to 0.2627 kN m-1 by -46% and from 3.847 to 2.013 MPa by -48%, respectively. Regardless of these substantial decline of mechanical properties, their initial electrochemical properties such as initial coulombic efficiency and voltage profile are almost the same. However, owing to high loading level, the 2 wt% electrode not only exhibits worse cycle performance than the 4 wt% electrode, but also cannot maintain its mechanical integrity only after 80 cycles. Therefore, if the binder content is reduced to increase the area capacity, the mechanical properties as well as the cycle performance must be carefully evaluated.
Keyword : Electrode binder, Electrochemical property, Adhesion strength, SAICAS, Lithium secondary battery

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