The electrochemical behaviour of the carbon-coated Ni 0.5TiOPO4 electrode material

Kenza Maher, Kristina Edström, Ismael Saadoune, Torbjörn Gustafsson, Mohammed Mansori

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Ni0.5TiOPO4 oxyphosphate exhibits good electrochemical properties as an anode material in lithium ion batteries but suffers from its low conductivity. We present here the electrochemical performances of the synthesized Ni0.5TiOPO4/carbon composite by using sucrose as the carbon source. X-ray diffraction study confirms that this phosphate crystallizes in the monoclinic system (S.G. P2 1/c). The use of the Ni0.5TiOPO4/C composite in lithium batteries shows enhanced electrochemical performances compared with the uncoated material. Capacities up to 200 mAh g-1 could be reached during cycling of this electrode. Furthermore, an acceptable rate capability was obtained with very low capacity fading even at 0.5C rate. Nevertheless, a considerable irreversible capacity was evidenced during the first discharge. In situ synchrotron X-ray radiation was utilized to study the structural change during the first discharge in order to evidence the origin of this irreversible capacity. Lithium insertion during the first discharge induces an amorphization of the crystal structure of the parent material accompanied by an irreversible formation of a new phase.

Original languageEnglish
Pages (from-to)2819-2825
Number of pages7
JournalJournal of Power Sources
Volume196
Issue number5
DOIs
Publication statusPublished - 1 Mar 2011
Externally publishedYes

Fingerprint

electrode materials
Carbon
Electrodes
carbon
Lithium batteries
lithium
Amorphization
Composite materials
Sugar (sucrose)
Synchrotrons
Electrochemical properties
Lithium
low conductivity
composite materials
Sucrose
lithium batteries
sucrose
Anodes
Phosphates
fading

Keywords

  • Carbon coating
  • Lithium ion batteries
  • NiTiOPO
  • Synchroton diffraction

ASJC Scopus subject areas

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

Cite this

The electrochemical behaviour of the carbon-coated Ni 0.5TiOPO4 electrode material. / Maher, Kenza; Edström, Kristina; Saadoune, Ismael; Gustafsson, Torbjörn; Mansori, Mohammed.

In: Journal of Power Sources, Vol. 196, No. 5, 01.03.2011, p. 2819-2825.

Research output: Contribution to journalArticle

Maher, Kenza ; Edström, Kristina ; Saadoune, Ismael ; Gustafsson, Torbjörn ; Mansori, Mohammed. / The electrochemical behaviour of the carbon-coated Ni 0.5TiOPO4 electrode material. In: Journal of Power Sources. 2011 ; Vol. 196, No. 5. pp. 2819-2825.
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