Abstract
• The rod-shaped NiMn 2 O 4 electrode materials have been synthesized by the citric acid sol–gel method. • NiMn 2 O 4 @TiO 2 and NiMn 2 O 4 @C composites demonstrate remarkable electrochemical properties. • The mechanism of surface-coating modification can be attributed to the coating layer forming a stabile SEI layer. In this paper, nickel-manganese bimetal oxide is used as the research object. The rod-shaped spinel NiMn 2 O 4 is synthesized by the citric acid sol–gel method and the subsequent high-temperature sintering process, and the surface is modified by carbon coating and titanium dioxide coating, and studied the effect of increasing the sintering temperature on the sample. Electrochemical experiments show that the C coating is beneficial to the improvement of the rate performance, while the TiO 2 -coated electrode material exhibits excellent cycle stability. The reason for the difference is that the TiO 2 coating on the surface can effectively buffer the volume expansion of the material, while the C coating can form a stable SEI layer.
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