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Synthesis, Characterization, and Electrochemical Analysis of the Cobalt Free Composite Cathode Material 0.5Li2MnO3-0.25LiMn2O4-0.25LiNi0.5Mn0.5O2 for Lithium Ion Batteries Applications

Published online by Cambridge University Press:  15 July 2016

Mónica López de Victoria ,
Loraine Torres-Castro ,
Rajesh K. Katiyar ,
Jifi Shojan ,
Valerio Dorvilien  and
Ram S. Katiyar
Mónica López de Victoria*
Affiliation:
Department of Physics and Institute for functional nanomaterials, P.O. Box 70377, University of Puerto Rico, San Juan, USA 00936-8377
Loraine Torres-Castro
Affiliation:
Department of Physics and Institute for functional nanomaterials, P.O. Box 70377, University of Puerto Rico, San Juan, USA 00936-8377
Rajesh K. Katiyar
Affiliation:
Department of Physics and Institute for functional nanomaterials, P.O. Box 70377, University of Puerto Rico, San Juan, USA 00936-8377
Jifi Shojan
Affiliation:
Department of Physics and Institute for functional nanomaterials, P.O. Box 70377, University of Puerto Rico, San Juan, USA 00936-8377
Valerio Dorvilien
Affiliation:
Department of Physics and Institute for functional nanomaterials, P.O. Box 70377, University of Puerto Rico, San Juan, USA 00936-8377
Ram S. Katiyar
Affiliation:
Department of Physics and Institute for functional nanomaterials, P.O. Box 70377, University of Puerto Rico, San Juan, USA 00936-8377
*
*(Email: mony_lopez3@hotmail.com)
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Abstract

The inclusion of a spinel structure in the layered-layered composite cathode material is currently explored to enhance the cycling stability and electrochemical properties of lithium ion batteries. Li2MnO3 based composite cathodes are one of the most widely investigated positive electrodes due to their high discharge capacity and rate capability. In our studies, we have synthesized the cobalt-free layered-layered-spinel composite cathode material, 0.5Li2MnO3-0.25LiMn2O4-0.25LiNi0.5Mn0.5O2 (LLNMO), via the sol-gel method. The structure of the composition was characterized using XRD and Raman Spectroscopy in which peaks corresponding to the layered and spinel structures were identified. The morphology along with the elemental analysis were studied with SEM/EDX. The SEM images exhibited agglomerates with particle size in the nano range and the EDX analysis confirmed the presence of manganese, nickel and oxygen in the structure. The electrochemical performance was analyzed by charge/discharge studies (CD) and cyclic voltammetry (CV). The composite cathode material showed high capacity retention and good cycle stability with a coulombic efficiency of 98%. The discussed results demonstrated that LLNMO is a promising cathode material for the next generation of Li-ion batteries.

Keywords

compositeenergy storagesol-gel
Type
Articles
Information
MRS Advances , Volume 1 , Issue 45: Energy and Environment , 2016 , pp. 3063 - 3068
Copyright
Copyright © Materials Research Society 2016 

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References

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