Preparation and electrochemical performances of ZnMoO4-ZnFe2O4 composite electrode materials.

As a typical transition metal oxide anode material, ZnMoO₄ can deliver a higher theoretical capacity of 951.6 mAh g⁻¹ due to its variable oxidation state and alloying reaction. However, lower conductivity and huge volumetric expansion restrict its further development. Herein, the modified sol–gel method is applied to synthesize a series of (1-x)ZnMoO₄-xZnFe₂O₄ (x = 0.1, 0.2, 0.3, 0.4, and 0.5) composites. The effects of compound proportion of ZnFe₂O₄ on the crystal phase structure and morphology for ZnMoO₄ have been investigated in detail. All the composites have been conducted on electrochemical measurements, and the results illustrate that the composites display better electrochemical performance than that of ZnMoO₄. Especially for 0.6ZnMoO₄-0.4ZnFe₂O₄, it can deliver a capacity of 550.7 mAh g⁻¹ after 500 cycles at a current density of 200 mA g⁻¹. Moreover, it also presents the higher capacity at higher current density. The improvement of electrochemical performance should be attributed to the synergistic effect of ZnFe₂O₄ and ZnMoO₄. [ABSTRACT FROM AUTHOR]