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The Effect of Calcination Temperature on the Layered Li1.05Ni0.9Co0.05Ti0.05O2 for Lithium-ion Battery

리튬이온전지용 층상 Li1.05Ni0.9Co0.05Ti0.05O2에 대한 소성 온도의 영향

  • Ko, Hyoung Shin (New Meterial R&D Center, Huayou New Energy Technology Co., Ltd.) ;
  • Park, Hyun Woo (Department of Chemical Engineering, Chungbuk National University) ;
  • Lee, Jong Dae (Department of Chemical Engineering, Chungbuk National University)
  • 고형신 (화유신에너지 전지재료연구소) ;
  • 박현우 (충북대학교 화학공학과) ;
  • 이종대 (충북대학교 화학공학과)
  • Received : 2018.03.16
  • Accepted : 2018.07.31
  • Published : 2018.10.01

Abstract

In this study, the $Ni_{0.9}Co_{0.05}Ti_{0.05}(OH)_2$ 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 $Li_{1.05}Ni_{0.9}Co_{0.05}Ti_{0.05}O_2$ were analyzed by FE-SEM, XRD and TGA. The electrochemical performance of the coin cell using a cathode active material and $LiPF_6$(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 $750{\sim}760^{\circ}C$. Also, the capacity retention exhibited high stability of 97.8~99.1% after 50cycles.

Keywords

Calcination temperature;Structural change;Concentration gradient;Oxygen desorption;Cathode material

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