A polyimide based all-organic sodium ion battery

Abstract

Developing new approaches to improve the performance of organic electrodes for rechargeable sodium batteries is important. Here we report studies on N,N?-diamino-3,4,9,10 perylenetetracarboxylic polyimide (PI) as a novel cathode for sodium battery and demonstrate an all-organic sodium ion battery using this polyimide as cathode and disodium terephthalate (NaTP) (pre-sodiated) as anode. The synthesised PI exhibits excellent electrochemical properties, when studied as cathode for sodium batteries, with a reversible capacity of 126 mAhg-1 along with good capacity retention and rate capability, in the voltage range of 1.5 to 3.5 V vs. Na+/Na. The all-organic sodium ion full cell delivered an initial capacity of 73 mAhg-1, with an average cell voltage of 1.35 V. The attractive electrochemical performances combined with the design flexibility of PTCDA based PI material, offer new possibilities for the development of efficient all-organic sodium batteries.