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Issue 44, 2014
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High dispersion of TiO2 nanocrystals within porous carbon improves lithium storage capacity and can be applied batteries to LiNi0.5Mn1.5O4

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Abstract

A new and simple strategy was developed to effectively disperse titanium dioxide (TiO2) nanocrystals into porous carbon (PC), and a series of hierarchical PC–TiO2 composites with different architectures were synthesized. By varying the amount of TiO2, from 30 wt% to 64 wt%, the lithium storage capacity of PC–TiO2 could be controllably varied from 546 mA h g−1 to 446 mA h g−1 under a current density of 50 mA g−1. Also, very stable cycling performances and rate capabilities could be obtained at the rates of 50 mA g−1 to 1600 mA g−1. By further increasing the content of TiO2 to 93%, another new composite of TiO2–C was also prepared and it demonstrated a storage capacity of 352 mA h g−1 at 50 mA g−1, which is much higher than that for most reported TiO2 materials. Based on these results, new full cells with a LiNi0.5Mn1.5O4 cathode, such as PC–TiO2/LiNi0.5Mn1.5O4, were successfully assembled and investigated. This full cell not only delivered a high energy density of 413 W h kg−1 but also showed a good rate capability and an energy retention of 90.5% over 100 cycles.

Graphical abstract: High dispersion of TiO2 nanocrystals within porous carbon improves lithium storage capacity and can be applied batteries to LiNi0.5Mn1.5O4

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Supplementary files

Article information


Submitted
11 Jul 2014
Accepted
03 Sep 2014
First published
03 Sep 2014

J. Mater. Chem. A, 2014,2, 18938-18945
Article type
Paper
Author version available

High dispersion of TiO2 nanocrystals within porous carbon improves lithium storage capacity and can be applied batteries to LiNi0.5Mn1.5O4

H. Ming, J. Ming, S. Oh, E. Lee, H. Huang, Q. Zhou, J. Zheng and Y. Sun, J. Mater. Chem. A, 2014, 2, 18938
DOI: 10.1039/C4TA03557G

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