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Studies on rheological, structural, optical, electrical and surface properties of LiMn2O4 thin films by varied spin rates

Balakrishnan T., Subramanian N. S., Kathalingam A.

Materials Science Poland

2017

Vol. 35, No. 3

626--631

LiMn2O4 thin films prepared by cost-effective spin coating method using optimized coating conditions are reported. Spin rate was varied and spin rate dependent properties were studied. Prepared films were characterized for their structural, morphological and optical properties. X-ray diffraction study of LiMn2O4 thin films confirmed the cubic spinel structure with the preferred orientation along (1 1 1) plane. Optical absorption studies showed band gap energy of 3.02 eV for the grown LiMn2O4 films. FT-IR bands assigned to asymmetric stretching modes of MnO6 group were located around 623 cm−1 and 514 cm−1 for the LiMn2O4 thin films. The weak band observed at 437 cm−1 was attributed to the LiO4 tetrahedra. The films showed high conductivity value 0.79 S/cm indicating the generation of effective network of the film for enhanced charge transport. AFM micrographs of the LiMn2O4 films deposited at 3000 rpm and 3500 rpm showed uniform distribution of fine grains throughout the surface without any dark pits, pinholes and cracks.

Effect of substrate temperature on the crystal properties of LiMn2O4 films prepared by RF magnetron sputtering

Isai M., Nakamura K., Hosokawa T., Izumichi T., Sekikawa S.

Journal of Automation Mobile Robotics and Intelligent Systems

2009

Vol. 3, No. 4

65-68

The LiMn2O4 films for Li secondary batteries have been prepared by a RF magnetron sputtering method. The LiMn2O4 powder was used as a target material. The deposition rate, XRD, and surface morphology were investigated as a function of substrate temperature (Tsub). It was found that the deposition rate had a peak at around the of 200 °C. This research was also designed for preventing the target material being oxidized during the reactive sputtering process. A quartz tube was inserted between shutter and target. It seems that the quartz tube is effective to prevent oxidation of target material.