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.