Abstract
Three-dimensional (3D) LiFePO4@MWCNTs composite has been prepared using phytic acid as the phosphorus source by a simple solvothermal method combined with freeze drying under vacuum. The relationships between the phase structures, the morphologies and electrochemical performance characteristics of the as-prepared samples are studied using a series of characterization methods. It is found that the MWCNTs wrap around the LiFePO4 particles to form a 3D network because of the reactions between the special functional groups of the phytic acid with Fe2+ and –CO or –COOH on the surface of the functionalized MWCNTs, resulting in the improvement of conductivity and the electron and ion transport. Due to these merits of MWCNTs and phytic acid, the LiFePO4@MWCNTs exhibits good electrochemical performance with high initial discharge capacities of 152.7, 149.6 and 138.8 mAh g−1 at 1, 2 and 5C, respectively. Even at 10C, it still delivers a capacity of 117.5 mAh g−1.
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