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

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

Research output: Contribution to journalArticle

91 Citations (Scopus)

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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Electrochemical properties
preparation
cycles
Electrochemical impedance spectroscopy
Thermoanalysis
Cyclic voltammetry
Structural properties
structural stability
Ions
thermal analysis
Electric potential
Chemical analysis
impedance
solid state
electric potential
products
Temperature
spectroscopy
ions

Keywords

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

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Preparation and electrochemical properties of Zn-doped LiNi0.8Co0.2O2 . / Fey, G. T K; Chen, J. G.; Subramanian, V.; Osaka, Tetsuya.

In: Journal of Power Sources, Vol. 112, No. 2, 14.11.2002, p. 384-394.

Research output: Contribution to journalArticle

Fey, G. T K ; Chen, J. G. ; Subramanian, V. ; Osaka, Tetsuya. / Preparation and electrochemical properties of Zn-doped LiNi0.8Co0.2O2 In: Journal of Power Sources. 2002 ; Vol. 112, No. 2. pp. 384-394.
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AU - Subramanian, V.

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N2 - 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.

AB - 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.

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