Li2CuVO4

A high capacity positive electrode material for Li-ion batteries

Hamdi Yahia, Masahiro Shikano, Yoichi Yamaguchi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The new compound Li2CuVO4 was synthesized by a solid state reaction route, and its crystal structure was determined from single crystal X-ray diffraction data. Li2CuVO4 was characterized by galvanometric cycling, cycle voltammetry, and electrochemical impedance spectroscopy. The structure of Li2CuVO4 is isotypic to Pmn21-Li3VO4. It can be described as a disordered wurtzite structure with rows of Li1/Cu1 atoms alternating with rows of (Li2/Cu2)-V-(Li2/Cu2) atoms along [100]. All cations are tetrahedrally coordinated. The lithium and copper atoms are statistically disordered over two crystallographic sites. The electrochemical cycling between 2.0 and 4.7 V indicates that almost two lithium atoms could be extracted and re-intercalated. This delivers a maximum discharge capacity of 257 mA h g-1 at a C/50 rate (theoretical capacity = 139 mA h g-1 for one lithium). Li2CuVO4 shows also high rate capability with a capacity of 175 mA h g-1 at 1C rate. This demonstrates that Cu-based compounds can be very interesting as electrodes for Li-ion batteries if Cu-dissolution is avoided.

Original languageEnglish
Pages (from-to)43-48
Number of pages6
JournalJournal of Power Sources
Volume320
DOIs
Publication statusPublished - 15 Jul 2016

Fingerprint

electrode materials
electric batteries
Lithium
Atoms
Electrodes
lithium
cycles
atoms
ions
Voltammetry
Solid state reactions
Electrochemical impedance spectroscopy
wurtzite
Cations
Copper
dissolving
Dissolution
Crystal structure
Positive ions
routes

Keywords

  • Ionic conductivity
  • Lithium cell
  • Positive electrode
  • Single crystal structure
  • Vanadate

ASJC Scopus subject areas

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

Cite this

Li2CuVO4 : A high capacity positive electrode material for Li-ion batteries. / Yahia, Hamdi; Shikano, Masahiro; Yamaguchi, Yoichi.

In: Journal of Power Sources, Vol. 320, 15.07.2016, p. 43-48.

Research output: Contribution to journalArticle

Yahia, Hamdi ; Shikano, Masahiro ; Yamaguchi, Yoichi. / Li2CuVO4 : A high capacity positive electrode material for Li-ion batteries. In: Journal of Power Sources. 2016 ; Vol. 320. pp. 43-48.
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