Nickel Complex Based Electrodes for Li‐ion Batteries

Abstract This work focuses on the development of nickel‐based quinone complexes as electrode materials for next‐generation rechargeable batteries. These complexes were synthesized with different substituents and their potential as anode materials in lithium‐based systems was investigated. Scanning electron microscopy (SEM) and energy‐dispersive X‐ray spectroscopy (EDX) confirmed the uniform distribution and composition of the electrode materials deposited by spin coating. Comprehensive electrochemical testing, including galvanostatic charge‐discharge cycling and impedance spectroscopy, showed that the dinickel complex 2 a present low capacity (10 mA h g −1 ) while the 2 b presents a maximum specific capacity up to 28 mA h g −1 at 0.4 C and very good stability over more than 200 cycles. Analogue 2 c exhibited a maximum specific capacity up to 25 mA h g −1 at 0.2 C, maintaining high cycling stability across different C‐rates but significantly lower capacity at higher C‐rates, indicating mass transport limitations.