Mesoporous TiO2@N-doped carbon composite canospheres synthesized by direct carbonization of surfactants after sol-gel process for superior lithium storage

Hongwei Zhu, Yunke Jing, Manas Pal, Yupu Liu, Yang Liu, Jinxiu Wang, Fan Zhang, Dongyuan Zhao

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46 Citations (Scopus)

Abstract

Here, we report mesoporous TiO2@N-doped carbon composite nanospheres synthesized via a double-surfactant-assisted assembly sol–gel process followed by sequential carbonization of surfactants under a N2 atmosphere. The resulting TiO2@N-doped C composite nanospheres are composed of uniformly distributed TiO2 nanocrystals with a diameter of ∼8 nm coated by a N-doped carbon layer that was formed by surfactants. Moreover, a large number of connected mesopores were observed in the nanospheres after high-temperature carbonization treatment. The synthesized nanospheres possess a large specific surface area (∼120 m2 g−1) and a large pore size (4–40 nm), with a well-defined spherical structure and a diameter in the nanoscale range. As an anode material for lithium-ion batteries (LIB), the mesoporous composite nanospheres delivered a reversible capacity of ∼117 mA h g−1 after 2000 cycles at a current rate as high as 10 C, as well as superior rate capability. The N-doped carbon layers greatly improved the overall electrical conductivity of the mesoporous TiO2 nanospheres. This study provides a remarkable synthetic route for the preparation of mesoporous TiO2-based N-doped carbon composite materials as high-performance anode materials in LIBs.
Original languageEnglish
Pages (from-to)1539-1546
Number of pages8
JournalNanoscale
Volume9
Issue number4
DOIs
Publication statusPublished - 28 Jan 2017
Externally publishedYes

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