Method for preparing composite carbon cathode material for super-capacitor battery

Abstract

The invention relates to a high-rate lithium-ion battery and a method for preparing a composite carbon cathode material for a super-capacitor battery. The method comprises the following steps: coating a surface-nano-crystallized core with a porous carbon coat provided with macro-pore / meso-pore / micro-pore three-dimensional layer pores; doping metal particles on the surface of the coat; and carrying out low-potential treatment, wherein the three steps are sequentially achieved by a template-based method, a combined method comprising dipping, chemical plating and physical mixing, and an electrochemical method of lithium pre-doping respectively. The process of the invention has the advantages of simple method and convenient operation; the prepared material has a core-coat structure and doped metallic elements, and meanwhile, the material has good performance in double-layer electric energy storage and lithium-ion intercalation and de-intercalation energy storage and effectively improves the high-rate performance and power density of the lithium-ion battery; the material meets the requirements of super-capacitor batteries in both the lithium-ion energy storage and double-layer electric energy storage of the cathode material; accordingly, the material can be used as the cathode of a high-performance lithium-ion battery; and the material has good performance in high-rate charging / discharging, so the material has a good prospect for industrialization.

Description

technical field [0001] The invention discloses a method for preparing a carbon-based composite negative electrode material for a supercapacitor battery; in particular, it refers to the preparation of a carbon-based composite negative electrode material for a supercapacitor battery that can be charged and discharged at a large rate and has high power density and high energy density method. It belongs to the field of electrochemical technology. Background technique [0002] The increasingly serious global environmental pollution and energy crisis have forced countries to find new sustainable energy sources. Green energy storage devices represented by lithium-ion batteries and supercapacitors have become the focus of attention and research hotspots. Although supercapacitors have the advantages of high power density and long cycle life, their energy density is relatively low; while lithium-ion batteries have the characteristics of high energy density and low self-discharge, but...

AI Technical Summary

Problems solved by technology

When these anode materials are applied to supercapacitor batteries, they have many disadvantages due to the limitations of their materials: ①The material structure is single, and the form of energy storage is single, which cannot maximize the performance characteristics of the supercapacitor battery's "dual functions", that is, it cannot be used at the same time. The combination of lithium ion chemical energy storage and electric double layer physical energy storage can achieve the purpose of high energy density and high power density; ②Due to the single material, the defects of the material itself cannot be overcome, such as graphite material has poor compatibility with solvents and Disadvantages such as unsatisfactory rate performance, lithium titanium oxide has the disadvantages of poor electrical conductivity, high potential relative to metal lithium and low capacity

The defects of these materials will greatly affect the performance of supercapacitor batteries in terms of high rate, large capacity, and high energy density; ③The electrolyte with good performance usually contains PC solvent, but the current commercial carbon negative electrodes are sensitive to PC solvent