Preparation and application of high-performance sodium-ion battery energy storage material based on regulation and control of hard carbon structure through ion catalysis

Abstract

The invention relates to the field of sodium ion secondary batteries, and provides a method for regulating and controlling a hard carbon structure based on transition metal manganese, which is used for a sodium ion battery negative electrode material. Cheap and easily available biomass is used as a carbon source, and manganese is ensured to be uniformly dispersed in a precursor polymer through coordination of manganese ions (Mn < 2 + >) and one-dimensional cellulose nanofibers and a coordination effect; according to the present invention, the graphene sheets are introduced into the graphene sheets, such that the conversion between the SP3 carbon and the SP2 carbon is effectively catalyzed so as to freely rearrange the graphene sheets, such that the expanded nano-graphite and the carbon micro-pores are formed, and the controllable adjustment of the carbon interlayer spacing and the micro-pores is achieved by adjusting the concentration; and finally, 92.05% of ultrahigh first efficiency and excellent circulating performance are obtained (the capacity retention ratio of 200 cycles is 95.80% under the current density of 20mA g <-1 >). The problems of low sodium ion first efficiency and poor cycling stability are solved through ion catalysis regulation and control, the first efficiency can be improved to 90% or above, the performance is improved by 30% or above, the energy density of the battery is greatly improved, and the total battery with sodium vanadium phosphate as the positive electrode has excellent electrochemical performance, has a good industrialization prospect and is suitable for industrial production. The method is very suitable for large-scale energy storage systems.

Description

technical field [0001] The present invention relates to the field of sodium ion batteries, in particular to a hard carbon structure based on transition metal manganese regulation and control for the negative electrode material of sodium ion batteries, and further relates to a high first efficiency, high capacity, low cost, environment-friendly hard carbon The preparation method of the material and the application of the material as a negative electrode in sodium ion batteries. Background technique [0002] Due to the energy problem and the global climate change problem caused by its use, human beings have made great efforts to find new energy storage technologies. Among the existing, highly efficient energy storage devices, secondary batteries are considered as storage systems with high energy density, making them ideal for portable electronic devices, hybrid vehicles, and large industrial equipment. Lithium-ion batteries are the most common rechargeable batteries on the ma...

AI Technical Summary

Problems solved by technology

At present, no hard carbon materials based on transition metal regulation have been used as anode materials for sodium ion batteries. In view of this, it is urgent to develop hard carbon sodium ion anode materials based on transition metal regulation to improve the first effect, cycle life and reversible capacity.

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