Preparation and electrochemical properties of Zn-doped LiNi0.8Co0.2O2

G. T.K. Fey, J. G. Chen, V. Subramanian, T. Osaka

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Abstract

Zn-doped LiZnyNi0.8-yCo0.2O2 (0.0000 ≤ y ≤ 0.0100) compositions were synthesized by a conventional solid-state method. The products were characterized by XRD, galvanostatic cycling, cyclic voltammetry, electrochemical impedance spectroscopy and thermal analysis. For the LiZn0.0025Ni0.7975Co0.2O2 system cycled between 3.0 and 4.2 V, the discharge capacities in the 1st and 100th cycles were 170 and 138 mAh/g with charge retention of 81%. The corresponding values for the undoped material were 158 and 97 mAh/g, with charge retention of 61.4%. The improved electrochemical properties of the doped system were attributed to the structural stability derived from incorporating the size-invariant Zn2+ ions. The Zn-doped system also showed improved capacity and cyclability when the cycling was performed in a voltage wider window (2.5-4.4V) and at a higher temperature (55°C). The structural and electrochemical properties of the doped and undoped materials were correlated.

Original languageEnglish
Pages (from-to)384-394
Number of pages11
JournalJournal of Power Sources
Volume112
Issue number2
DOIs
Publication statusPublished - 2002 Nov 14

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Keywords

  • Cathode materials
  • LiNiCoO
  • Lithiated nickel cobalt oxides
  • Lithium ion batteries
  • Zn-doping

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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