Preparation method of Co2B protective layer coated nitrogen-doped MXene and application of Co2B protective layer coated nitrogen-doped MXene in sodium-ion battery

Abstract

According to the preparation method of the Co2B protective layer coated nitrogen-doped MXene and the application of the Co2B protective layer coated nitrogen-doped MXene in the sodium-ion battery, crystal lattices can be properly changed due to defects generated by nitrogen doping, so that the electrochemical performance of the sodium-ion battery is enhanced. Co2 + is adsorbed through static electricity and Co2B is generated in situ by utilizing rich negative electricity groups on the surface of MXene. By controlling the nitrogen doping process, amorphous Co2B is subjected to crystal transformation under the action of high temperature, and finally N-Ti3C2-coated Co2B is obtained. Nitrogen doping enables MXene to expose more active sites, and Co2B uniformly loaded on the surface can effectively inhibit volume expansion generated in the reaction process. Therefore, the actual electrochemical performance is improved, the rate capability under high cycle specific capacity and large current density is embodied, and the problems of poor cycle performance and low energy density of the sodium ion battery are solved.

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