Abstract
LiMn2O4 thin films are deposited on gold coated polyimide flexible substrates using RF magnetron sputtering technique maintained at a moderate substrate temperature of 300℃. The films exhibited characteristic peaks with predominant (111) orientation representing cubic spinel structure of Fd3m symmetry with an evaluated lattice parameter of 8.199 ?. The surface topography of films exhibited pyramidal shaped grains oriented vertical to the substrate surface with root mean square surface roughness of 90 nm. The Pt/LiMn2O4 electrochemical cell in aqueous region exhibited two step de-insertion and insertion kinetics of Li ion during oxidation and reduction reaction with an initial discharge capacity of 36 μAh?cm_2?μm_1.
Highlights
In the existing prompt developing science and technology decade, much attention has been devoted to the development of all solid state thin film microbatteries to power the miniaturized micro and nano electronic devices such as MEMS and NEMS [1,2]
A discharge capacity of 43.5 μAh·cm−2·μm−1 was observed for ten cycles by Jayanth et al [25] for the LiMn2O4 films deposited on metallized silicon substrates using RF magnetron sputtering technique
The films exhibited characteristic peaks with predominant (111) orientation representing cubic spinel structure of Fd3m symmetry, in which the oxygen ions are placed on a face-centered cubic array
Summary
In the existing prompt developing science and technology decade, much attention has been devoted to the development of all solid state thin film microbatteries to power the miniaturized micro and nano electronic devices such as MEMS and NEMS [1,2] The realization of such microbatteries is originated from the synthesis and properties of thin film cathode materials with high energy density and specific capacity [3,4]. The fabrication of thin film coatings on polyimide flexible substrate is a challenging and novel research area for the future cutting-edge technologies. Bing-Joe Hwang et al [23] deposited LiMn2O4 films on ITO coated Pt/Al flexible substrates using RF magnetron sputtering technique and observed a discharge capacity of 67.5 mAh/g. Au/Polyimide Flexible Substrates aqueous electrolyte media by investigating cyclic voltametry and chronopotentiometry measurements
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