High lithium storage in micrometre sized mesoporous spherical self-assembly of anatase titania nanospheres and carbon

Das, Shyamal K. ; Darmakolla, Srikarrao ; Bhattacharyya, Aninda J. (2010) High lithium storage in micrometre sized mesoporous spherical self-assembly of anatase titania nanospheres and carbon Journal of Materials Chemistry, 20 (8). pp. 1600-1606. ISSN 0959-9428

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Official URL: http://pubs.rsc.org/en/Content/ArticleLanding/2010...

Related URL: http://dx.doi.org/10.1039/B919139A

Abstract

Composite of anatase titania (TiO2) nanospheres and carbon grown and self-assembled into micron-sized mesoporous spheres via a solvothermal synthesis route are discussed here in the context of rechargeable lithium-ion battery. The morphology and carbon content and hence the electrochemical performance are observed to be significantly influenced by the synthesis parameters. Synthesis conditions resulting in a mesoporous arrangement of an optimized amount carbon and TiO2 exhibited the best lithium battery performance. The first discharge cycle capacity of carbon-titania mesoporous spheres (solvothermal reaction at 150 °C at 6 h, calcination at 500 °C under air, BET surface area 80 m2g-1) was 334 mAhg-1 (approximately 1 Li) at current rate of 0.066 Ag-1. High storage capacity and good cyclability is attributed to the nanostructuring of TiO2 (mesoporosity) as well as due to formation of a percolation network of carbon around the TiO2 nanoparticles. The micron-sized mesoporous spheres of carbon-titania composite nanoparticles also show good rate cyclability in the range (0.066–6.67) Ag-1.

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