Mondal, Aniruddha and Maiti, Sandipan and Singha, Krishnadipti and Mahanty, Sourindra and Panda, Asit Baran (2017) TiO2-rGO nanocomposite hollow spheres: large scale synthesis and application as an efficient anode material for lithium-ion batteries. Journal of Materials Chemistry A, 5 (45). pp. 23853-23862. ISSN 2050-7488

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We report here a controllable large-scale synthesis protocol for TiO2-rGO nanocomposites with a hollow spherical morphology by a novel aerosol-assisted spray drying method followed by calcination. The developed strategy is easy to scale-up without significant change in morphology. The precursors used for the synthesis are aqueous titanium ammonium peroxo-carbonate complex (TAPCC) solution, being decomposable at low temperatures, and an aqueous graphene oxide (GO) suspension; no additive or structure-directing agent is required. Both the precursors play vital roles in hollow sphere formation. The enhanced internal pressure inside the atomized droplets built-up in situ through decomposition of TAPCC forming gaseous CO2, NH3, O-2 and H2O vapour, helps overcome the crumpling effect of GO. The sheet structure of GO provides sufficient mechanical strength to prevent bursting of the expanded droplets. The synthesized TiO2-rGO hollow spheres are porous, composed of 10-20 nm TiO2 particles dispersed on the surfaces of rGO with a surface area of 86 m(2) g(-1). The synthesized TiO2-rGO composites showed superior electrochemical performance as lithium-ion battery (LIB) anode with capacity values of 265 mA h g(-1) (10 wt% rGO) and 274 mA h g(-1) (20 wt% rGO) at 18.8 mA g(-1) as compared to 236 mA h g(-1) for the pristine sample with a 2D flake-like morphology. This is due to the unique thin-walled hollow-spherical structure of TiO2-rGO composites, which provides a large number of electrochemically accessible active sites, favorable diffusion paths for Li+ ions and enhanced charge transport. Thus, the present synthetic method has great potential for large scale production of TiO2-rGO hollow spheres for application as anode in practical high-rate lithium-ion batteries.

Item Type: Article
Subjects: Electronics
Divisions: Fuel Cell and Battery
Depositing User: Bidhan Chaudhuri
Date Deposited: 29 Jan 2018 11:53
Last Modified: 29 Jan 2018 11:53

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