Synthetically Encapsulated \& Self-Organized Transition Metal Oxide Nano Structures inside Carbon Nanotubes as Robust Li-ion Battery Anode Materials

TL;DR

This study explores the synthesis and electrochemical performance of transition metal oxide nanostructures encapsulated inside carbon nanotubes, demonstrating enhanced stability and capacity for Li-ion battery anodes through innovative morphology control.

Contribution

It introduces a novel synthesis method using camphor to control morphology and systematically evaluates how encapsulation improves electrochemical stability and capacity.

Findings

All encapsulated samples show superior cyclic stability compared to bare oxides.

Morphology and filling fraction significantly influence specific capacity.

Presence of oxide nano-particles outside CNT affects electrochemical performance.

Abstract

We report a comprehensive study on the electrochemical performance of four different Transition Metal Oxides encapsulated inside carbon nanotubes (CNT). Irrespective of the type of oxide-encapsulate, all these samples exhibit superior cyclic stability as compared to the bare-oxide. Innovative use of camphor during sample synthesis enables precise control over the morphology of these self-organized carbon nanotube structures, which in turn appears to play a crucial role in the magnitude of the specific capacity. A comparative evaluation of the electrochemical data on different samples bring forward interesting inferences pertaining to the morphology, filling fraction of the oxide-encapsulate, and the presence of oxide nano-particles adhering outside the filled CNT. Our results provides useful pointers towards the optimization of critical parameters, thus paving the way for using these synthetically encapsulated and self-organized carbon nanotube structures as anode materials for Li-ion batteries, and possibly other electrochemical applications.