Korean Journal of Chemical Engineering

, Volume 36, Issue 4, pp 620–624 | Cite as

Electrochemical characteristics of lithium-excess cathode material (Li1+xNi0.9Co0.05Ti0.05O2) for lithium-ion batteries

  • Hyoung Shin Ko
  • Hyun Woo Park
  • Geun Joong Kim
  • Jong Dae LeeEmail author
Materials (Organic, Inorganic, Electronic, Thin Films)


A Ni0.9Co0.05Ti0.05(OH)2 precursor was synthesized with the concentration gradient method. To overcome the Li-ion shortage the problem due to the formation of a solid electrolyte interphase (SEI) layer during the initial charge/discharge process in the cathode material, lithium-excess Li1+xNi0.9Co0.05Ti0.05O2 (0≤x≤T0.07) cathode materials were investigated by physical and electrochemical analyses. The physical properties of the lithium-excess cathode materials were analyzed using FE-SEM and XRD. A coin type half-cell was fabricated with the electrolyte of 1M LiPF6 dissolved in organic solvents (EC:EMC=1: 2 vol%). The electrochemical performances were analyzed by the initial charge/discharge efficiency, cycle stability, rate performance and electrochemical impedance spectroscopy (EIS). The initial charge capacity of the cathode material was excellent at about 199.8–201.7mAh/g when the Li/Metal ratio was 1.03–1.07. Additionally, the efficiency of the 6.0 C/0.1 C was 79.2–79.9%. When the Li/Metal ratio was 1.05, the capacity retention showed the highest stability of 97.8% after 50 cycles.


Lithium-excess Li/Metal Ratio Li-ion Shortage SEI Layer Cathode Material 


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Copyright information

© The Korean Institute of Chemical Engineers 2019

Authors and Affiliations

  • Hyoung Shin Ko
    • 1
  • Hyun Woo Park
    • 2
  • Geun Joong Kim
    • 2
  • Jong Dae Lee
    • 2
    Email author
  1. 1.New Material R&D CenterHuayou New Energy Technology Co., Ltd.Zhejiang ProvinceChina
  2. 2.Department of Chemical EngineeringChungbuk National UniversitySeowongu, Cheongju, ChungbukKorea

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