Defining role of the surface and bulk contributions in camphoric carbon grafted lithium nickel manganese oxide powders for lithium ion batteries

• Published in: Ceramics international Vol. 41; no. 2; pp. 3269 - 3276
• Main Authors: Anupriya, K.H., Ranjusha, R., Nair, Shantikumar V., Balakrishnan, A., Subramanian, K.R.V.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01-03-2015
• Subjects: Batteries; Blends; Camphor; Carbon; Composite; Electrode; Electrodes; Fading; Grafting; Lithium; Lithium-ion batteries; Manganese oxides; Nanostructure; Nickel; Stability; Electrode; Stability; Batteries; Composite; Camphor
• ISSN: 0272-8842; 1873-3956
• DOI: 10.1016/j.ceramint.2014.10.183

In the present study, lithium nickel manganese oxide powders grafted with camphoric nano-carbons have been exploited to fabricate high voltage, high capacity rechargeable electrodes for Li storage. The prepared lithium nickel manganese oxide particles were pyrolyzed using a camphoric solution to graft porous camphoric carbon layer on to the surface. A detailed study was performed to elucidate the effect of carbon content on the performance of the electrode. Relative contributions of capacitive and diffusion-controlled processes underlying these composite electrodes have been mathematically modeled. The lithium nickel manganese oxide composites showed two times higher conductivity as compared to the pristine samples. These electrodes exhibited a specific capacity value of ~154mAhg-1 and showed good rate capability. The capacity fading was found to be ~17% at the end of 200 cycles for 100% depth of discharge. The specific capacity and capacity retention for these blends were found to be ~10% and ~40% higher respectively than pristine powders which are promising considering their low cost and facile fabrication process.