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Received March 16, 2018
Accepted July 31, 2018
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리튬이온전지용 층상 Li1.05Ni0.9Co0.05Ti0.05O2에 대한 소성 온도의 영향
The Effect of Calcination Temperature on the Layered Li1.05Ni0.9Co0.05Ti0.05O2 for Lithium-ion Battery
화유신에너지 전지재료연구소, 314500 중국 절강성 취저우시 하이테크놀로지 산업단지(phase-2) 입신로 18번지 1충북대학교 화학공학과, 28644 충청북도 청주시 서원구 충대로 1
New Meterial R&D Center, Huayou New Energy Technology Co., Ltd., No.18, Wuzhen E. Rd., Economic Development Zone of Tonxiang, Zhejiang Province, 314500, China 1Department of Chemical Engineering, Chungbuk National University, 1, Chungdae-ro, Seowongu, Cheongju-si, Chungcheongbuk-do, 28644, Korea
jdlee@chungbuk.ac.kr
Korean Chemical Engineering Research, October 2018, 56(5), 718-724(7), 10.9713/kcer.2018.56.5.718 Epub 5 October 2018
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Abstract
본 연구에서는 농도구배형 공침합성법을 통해 Ni0.9Co0.05Ti0.05(OH)2 전구체를 제조하였다. 높은 니켈함량의 양극 활물질에서 나타나는 산소 탈리에 따른 구조변화문제를 극복하기 위하여 소성온도 변화에 따른 양극 활물질의 물리적, 전기화학적 분석방법을 사용하여 조사하였다. Li1.05Ni0.9Co0.05Ti0.05O2의 물리적 특성은 FE-SEM, XRD, TGA를 이용하여 분석하였다. 양극 활물질과 LiPF6(EC:EMC=1:2 vol%) 전해질을 사용하여 제조한 코인셀의 전기화학적 성능은 초기 충·방전 효율, 사이클 유지율 및 율속 테스트를 통해 분석하였다. 제조된 양극재의 초기 충전 용량 및 초기효율은 소성 온도 750~760 °C에서 244.5~247.9 mAh/g, 84.2~85.8%로 우수하였다. 또한 용량 보존율은 50사이클 후에 97.8~99.1% 의 높은 안정성을 나타내었다.
In this study, the Ni0.9Co0.05Ti0.05(OH)2 precursor was prepared by the concentration gradient co-precipitation method. In order to overcome the structural change due to oxygen desorption in the cathode active material with high nickel content, the physical and electrochemical analysis of the cathode active material according to the calcination temperature were investigated. Physical properties of Li1.05Ni0.9Co0.05Ti0.05O2 were analyzed by FE-SEM, XRD and TGA. The electrochemical performance of the coin cell using a cathode active material and LiPF6(EC:EMC=1:2 vol%) electrolyte was evaluated by the initial charge/discharge efficiency, cycle retention, and rate capabilities. As a result, the initial capacity and initial efficiency of cathode materials were excellent with 244.5~247.9 mAh/g and 84.2~85.8% at the calcination temperature range of 750~760 °C. Also, the capacity retention exhibited high stability of 97.8~99.1% after 50cycles.
Keywords
References
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