Sodium ion batteries have attracted aroused attention as a novel kind of energy storage technology, due to its abundant resources, low cost and environmental friendliness. Similar to LIBs, an overwhelming majority of host materials developed so far for SIBs are based on transition-metal compounds, which have serious cost and negative environmental impacts on battery applications. In contrast, redox-active organic materials have competitive advantages of low cost，resource sustainability and structural diversity, being an ideal candidate for promising candidates for large-scale energy storage applications¹. In this study, A Polyimide composite synthesized from 3,4,9,10-perlenetetracrboxylic dianhydride (PTCDA) and phenylene diamine (PDA) was investigated as a cathode materials for non-aqueous Na-ion batteries². The polymer was synthesized via a facile dehydration condensation reaction in quinoline as shown in Figure 1a. And this composite demonstrates a high reversible capacity of 99.6 mAh g^-1 at potential of 2.2 V (vs Na⁺/Na), showing a great potential as cathode materials for sodium ion batteries (Figure 1b and 1c ).

1.Zhang, Y.,Wang, J.,Riduan, S. N. J. Mater. Chem. A, 39 14902 (2016)

2.Song, Z.,Zhan, H.,Zhou, Y. Angewandte Chemie, 49 (45): 8444-8.(2010)