Abstract
The mesoporous Li2FeSiO4@ordered mesoporous carbon (CMK-3) has been firstly synthesized by a sol–gel method. The structural properties of the samples are characterized by X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy and nitrogen adsorption–desorption. The composite is then evaluated as a cathode material for lithium ion batteries. It exhibits greatly improved electrochemical performance compared with bulk Li2FeSiO4 and shows an excellent rate capability (160, 148, 129, 110, 90, 66 and 50mAhg−1 at 0.1, 0.2, 0.5, 1, 2, 5 and 10C, respectively) with significantly enhanced cycling performance. The greatly enhanced lithium storage properties of the Li2FeSiO4@CMK-3 composites may be attributed to the interpenetrating conductive carbon network, ordered mesoporous structure, and small uniform Li2FeSiO4 nanocrystallites that increase the ionic and electronic conduction throughout the electrode.
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