Abstract

The 3D multiporous structure polyimides were obtained by introducing of the triphenylamine unit as linkage in the pyromellitic-based polyimide (N1) and the naphthalene-1,4,5,8-tetracarboxylic-based polyimides (N2), respectively. Then, the functional polyimides were explored as the anode of Lithium ion batteries instead of as traditional cathode. As a result, the obtained triphenylamine-based polyimides exhibited a good reversible capacity and remarkably improved rate performance. Specially for the porous N1, it delivered a gradually increased capacity of up to 349 mAh g-1 during the cycle testing and a rate capacity of 400 mAh.g-1 at an even high current density of 500 mAg-1. Significant eletrochemical performances for the triphenylamine-contained polyimide could be ascribed to the unique polyimide chemical structure and the constructed 3D multiporous structure with the high surface area (738 m2 g-1 for N1 and 456 m2 g-1 for N2), which benefited to excellent Li+ diffusion kinetics in porous electrode. This makes it promising as anode of rechargeable batteries with the remarkably electrochemical performances.

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