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Effect of ZnO Coating on the Electrochemical Performance of LiMn1.5Ni0.5O4 Cathode Material

Published online by Cambridge University Press:  26 February 2011

Rahul Singhal ,
Maharaj S Tomar ,
Juan G Burgos ,
Arun Kumar  and
Ram S Katiyar
Rahul Singhal
Affiliation:
rahulsinghal_25@yahoo.com, University of Puerto Rico, Physics, P.O. Box 9016, Mayaguez, 00680, Puerto Rico, 1-787-832-4040 Ext 2595, 1-787-832-1135
Maharaj S Tomar
Affiliation:
mtomar@uprm.edu, University of Puerto Rico, Physics, P.O.Box 9016, Mayaguez, 00680, Puerto Rico
Juan G Burgos
Affiliation:
jgb_fisik@yahoo.com, University of Puerto Rico, Physics, P.O. Box 23343, San Juan, 00931, Puerto Rico
Arun Kumar
Affiliation:
arun.narsan@gmail.com, University of Puerto Rico, Physics, P.O. Box 23343, San Juan, 00931, Puerto Rico
Ram S Katiyar
Affiliation:
rkatiyar@hotmail.com, University of Puerto Rico, Physics, P.O. Box 23343, San Juan, 00931, Puerto Rico
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Abstract

LiMn1.5Ni0.5O4 cathode material was prepared by sol-gel method and annealed at 850°C for 15 hrs. The prepared powder was coated with ZnO by dissolving zinc acetate in methanol and LiMn1.5Ni0.5O4 powder was mixed in this solution followed by the continuous stirring for 4 hr. The LiMn1.5Ni0.5O4 and ZnO coated LiMn1.5Ni0.5O4 powder was characterized using X-ray diffraction, TEM and Raman spectroscopy. The coin cell was fabricated using LiMn1.5Ni0.5O4 and ZnO coated LiMn1.5Ni0.5O4 as cathode materials, LiPF6, dissolved in EC/DMC (1:1 wt ratio) as electrolyte, and Li foil as anode. The cyclic voltammetric and charge-discharge characteristics were carried out for the coin cell using LiMn1.5Ni0.5O4 and ZnO coated LiMn1.5Ni0.5O4 cathode materials. It was found that the ZnO coated LiMn1.5Ni0.5O4 cathode materials showed improved discharge capacity (∼146mAh/g) as compared to the pure LiMn1.5Ni0.5O4 (∼140mAh/g). The discharge capacity retention after 50 cycles was found to be about 94% and 97% for LiMn1.5Ni0.5O4 and ZnO coated LiMn1.5Ni0.5O4 cathode materials, respectively.

Keywords

coatingenergy-storageLi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 972: Symposium AA – Solid-State Ionics—2006 , 2006 , 0972-AA06-07
Copyright
Copyright © Materials Research Society 2007

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