Understanding Intrinsic Electrochemical Properties of NiCo-Metal-Organic Framework-Derived NiCo2O4 as a Li-Ion Battery Anode

초록

This study explores the electrochemical properties of additive-free NiCo2O4 derived from NiCo-metal-organic frameworks (MOFs) as a high-performance anode material for lithium-ion batteries (LIBs), excluding the effect of additives. NiCo-MOF was synthesized via an ultrasonic-assisted method and deposited on stainless steel foils using alternating current electrophoretic deposition (AC-EPD). The resulting thin films exhibited outstanding cycling stability and rate performance, maintaining a specific capacity of similar to 1200 mAh/g over 250 cycles at a high current density of 2.35 A/g, with nearly 100% Coulombic efficiency. Differential capacity analysis revealed enhanced redox activity at 0.8 V and 1.7 V during lithiation and delithiation, attributed to the decomposition of NiCo2O4 into metallic Ni and Co, followed by their oxidation to Ni2+ and Co3+, respectively. The gradual activation of electroactive sites, coupled with improved electrode kinetics and structural adjustments, contributed to the observed capacity increase over cycles. These findings underscore the potential of NiCo2O4 as a robust and efficient anode material for next-generation LIBs.

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