Enhanced Li-ion cycling performance of CuxCo1-xFe2O4 spinel nanoparticles with abundant oxygen vacancies

초록

Cu-doped Co-ferrite composites (CuxCo1-xFe2O4, x = 0.1, 0.2, and 0.3) are successfully synthesized via a simple co-precipitation method and evaluated as anode materials for lithium-ion batteries (LIBs). Among the prepared samples, the composite with x = 0.2 demonstrates the best electrochemical performance, delivering a high reversible capacity of 784 mAh g(-1) at a current density of 100 mA g(-1) after 100 charge-discharge cycles. By contrast, the capacities of the x = 0.1 and x = 0.3 composites decline significantly after 60 cycles. Comprehensive material characterizations reveal that the superior performance of the Cu0.2Co0.8Fe2O4 composite can be attributed to its optimal phase composition, enhanced nanoparticle interconnectivity, and the presence of abundant oxygen vacancies, which collectively improve the electronic conductivity. The results underscore the importance of the spinel structure, the Cu-to-Co ratio, and the resulting microstructural features in achieving a high surface area conducive to efficient ion transport. This work not only highlights the potential of Cu-doped Co-ferrites as high-performance LIB anodes but also introduces a straightforward and scalable chemical synthesis route for their fabrication.

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