Structural and electrochemical characterization of Li2MnSiO4 cathode material

Research output: Contribution to journalArticle

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Abstract

The candidate cathode material Li2MnSiO4 for lithium-ion cells was synthesized by an all-acetate precursor sol/gel method under a reducing atmosphere at 600, 700, and 800 °C. The material prepared at 700 °C was a pure phase and had the structural order of Li 3PO4 orthorhombic (S.G. Pmn21) phase. The temperature dependence of the molar magnetic susceptibility of Li 2MnSiO4 was found to be consistent with an antiferromagnetic material with a Néel temperature of 12 K. The calculated effective moment confirmed that the observed magnetic behavior involves Mn2+ ions in a high spin configuration in tetrahedral sites. Scanning electron microscopy of Li2MnSiO4 showed large aggregates (10 to 50 μm) composed of nanosized particles (100-200 nm). The as-prepared material was almost electrochemically inactive despite the presence of 15 wt % carbon additive. The material was treated by carbon coating using cellulose carbon source precursor and particle size reduction using high-energy ball milling. In coin-cell tests, the carbon-coated and ballmilled materials yielded charge capacities of 190 and 172 mAh/g, respectively, under a current density of 10 mA/g. At present, the cationic mixing between Li+ and Mn2+ ions in their mutual crystallographic sites is the main impediment to the achievement of the full theoretical capacity of Li 2MnSiO4 (333 mAh/g).

Original languageEnglish
Pages (from-to)20733-20737
Number of pages5
JournalJournal of Physical Chemistry C
Volume113
Issue number48
DOIs
Publication statusPublished - 9 Dec 2009
Externally publishedYes

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Cathodes
cathodes
Carbon
carbon
Ions
Antiferromagnetic materials
ions
cells
cellulose
Ball milling
balls
acetates
Magnetic susceptibility
Lithium
Cellulose
lithium
Sol-gel process
gels
current density
moments

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Electronic, Optical and Magnetic Materials
  • Surfaces, Coatings and Films
  • Energy(all)

Cite this

Structural and electrochemical characterization of Li2MnSiO4 cathode material. / Belharouak, Ilias; Abouimrane, Ali; Amine, K.

In: Journal of Physical Chemistry C, Vol. 113, No. 48, 09.12.2009, p. 20733-20737.

Research output: Contribution to journalArticle

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