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Received December 13, 2016
Accepted January 13, 2017
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상용 고용량 리튬이온이차전지용 NCA 양극활물질의 전기화학적 특성
Electrochemical Properties of Commercial NCA Cathode Materials for High Capacity of Lithium Ion Battery
충북대학교 화학공학과, 28644 충청북도 청주시 서원구 충대로 1
Department of Chemical Engineering, Chungbuk National University, 1, Chungdae-ro, Seowon-gu, Cheongju-si, Chungbuk, 28644, Korea
nabk@chungbuk.ac.kr
Korean Chemical Engineering Research, April 2017, 55(2), 163-169(7), 10.9713/kcer.2017.55.2.163 Epub 31 March 2017
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Abstract
LiNi1-x-yCoxAlyO2(x=0.15, y=0.045 혹은 0.05, NCA) 양극소재의 전기화학적 특성 및 양극소재의 입자 크기 분포에 대한 리튬이온이차전지의 수명특성에 대한 영향을 살피기 위해 두 종의 상업용 NCA (NCA#1, NCA#2) 양극소재를 리튬이온이차전지의 양극으로 사용하였다. NCA#1은 약 5 μm의 균일한 구형의 입자로 구성되어 있고 NCA#2는 약 5 μm와 11 μm 정도의 입자들이 혼합되어 있는 분말이다. 충방전 측정 결과 NCA#2는 초기 방전용량은 197.0 mAh/g으로 NCA#1에 비해 높게 나타났다. NCA#1과 NCA#2의 용량 유지율(30사이클 기준)은 각각 92%와 94%로 나타났다.
In order to investigate the electrochemical properties and the particle size effect of LiNi1-x-yCoxAlyO2 (x=0.15, y=0.045 or 0.05, NCA) for lithium ion batteries (LIBs), two commercial NCA cathode materials (NCA#1, NCA#2) were used as cathode materials for LIB. The average particle size of the NCA#1 which consisted of uniform spherical particles was found to be approximately 5 μm. NCA#2 consisted of particles with bimodal size distribution of approximately 5 μm and 11 μm. From the results of charge-discharge performance test, a high initial discharge capacity of 197.0 mAh/g was obtained with NCA#2, which is a higher value than that with NCA#1. The cycle retentions of NCA#1 and NCA#2 up to 30 cycles were 92% and 94%, respectively.
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