Hydrothermal Synthesis of Li2MnSiO4 Powders as a Cathode Material for Lithium Ion Cells

Shao Hua Luo; Ming Wang; Xu Zhu; Gui Hong Geng

doi:10.4028/www.scientific.net/KEM.512-515.1588

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 512-515Hydrothermal Synthesis of Li2MnSiO4 Powders as a...

Hydrothermal Synthesis of Li₂MnSiO₄ Powders as a Cathode Material for Lithium Ion Cells

Abstract:

Li₂MnSiO₄ cathode materials were prepared by hydrothermal reaction at 150°C using LiOH, Si(OC₂H₅)₄ and Mn(Ac)₂.4H₂O as raw materials followed by a low temperature heat annealing at 650°C. The samples were characterized by X-ray diffraction, scanning electron microscopy, FTIR. The powders electrochemical performance was investigated in terms of cycling behavior. Nanometer-sized flake crystalline particles of Li₂MnSiO₄ are obtained with some degree of agglomeration and little impure phases are detected after annealing. The charge capacity of the Li₂MnSiO₄ samples is 306 mAh/g (about 1.84 Li⁺ per unit formula extracted), and the discharge capacity is 114 mAh/g (about 0.68 Li⁺ per unit formula inserted) in the first cycle in the voltage range of 1.5–4.8 V under a rate of C⁄20. With increasing cycle number, the cell exhibits a well cycle performance with more than 95% coulombic efficiency and the maintenance of 61% of its discharge capacity after 50 cycles.

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Periodical:

Key Engineering Materials (Volumes 512-515)

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1588-1591

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.512-515.1588

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Online since:

June 2012

Authors:

Shao Hua Luo, Ming Wang, Xu Zhu, Gui Hong Geng

Keywords:

Cathode Material, Hydrothermal Synthesis, Li₂MnSiO₄

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