Lithium ion batteries (LiB’s) technology has been commercially attractive since its inception and extensive research is being undertaken on various components of LiB’s. However, there has not been much strategized research focusing on designing a tailored interface for LiB electrodes. In this work we put effort to utilize Ar-BIAN based conjugated polymeric materials to enhance the performance of LiB’s. This would have three fold benefits. (i) Enhanced interaction with the current collector, (ii) Reduced over-potential due to the inherent electrochemical properties of the BIAN group, (iii) Reduced charge transfer resistance because of structure suitable for conduction.<br/>Bis(aryl)acenaphthenequinonediimine (Ar-BIAN), which has long been employed as ligands for transition metals, has been considered here. Ar-BIAN metal complexes have been employed as catalysts for wide variety of reactions. However, only recently the rich redox chemistry of Ar-BIAN based compounds has been evaluated. But no report exists on Ar-BIAN based polymers and applications exploiting their electrochemical properties.<br/>Hence, in the current study, BIAN-Flu copolymer was synthesized and was used as a binder for fabrication of graphite anodes of LiB’s. DFT studies, charge discharge (C/D) studies and dynamic electrochemical impedance spectroscopy (DEIS) was performed for studying the binder performance and a comparison was drawn between the synthesized polymer and conventional PVDF to exhibit its superior performance. Figure 1 shows the schematic illustration of working principle of BIAN-Flu polymer binder compared to that of commercially available PVDF based binders based on their band levels. BIAN-Flu based binder also outperformed PVDF based binder when used in other active materials like TiO<sub>2</sub> nanoparticles, hence providing us with a proof of concept of the functional binder material.

BIAN based conjugated polymer binder for Li ion secondary battery anodes

255th National Meeting (2018)

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