Production method for high-energy ratio super capacitance electrode material

Abstract

The invention relates to a method for manufacturing super capacitor electrode materials with high energy ratio, belonging to energy material technology and related field. The invention uses mechanical chemical treatment means to prepare porous carbon / electric conduction agent / polytetrafluoroethylene composite electrode materials. The prepared materials can evenly compound porous carbon / carbon black / polytetrafluoroethylene to form composite electrode materials composed of nanoes, thereby adjusting pore size of the porous carbon and improving utilization efficiency of the carbon pore; when preparing the super capacitor electrode using the materials, because the carbon black and the polytetrafluoroethylene are evenly dispersed in the porous carbon base by the mechanical chemical treatment, the size and the distribution of the pore diameter of the carbon pore are changed, so that the electrode has higher unit capacity, on the other hand, the carbon framework can also provide a good electric conduction channel for the carbon black corpuscules dispersed therein, equivalent internal resistance of the capacitor is reduced, so the capacitor has higher power and energy density.

Description

technical field [0001] The invention relates to a manufacturing method of a high energy ratio supercapacitor electrode material. Specifically, it relates to a preparation method of using dry mechanical force to physically and chemically treat porous carbon / conductive agent / polytetrafluoroethylene composite electrode material. Background technique [0002] Supercapacitors (supercapacitors), also known as electrochemical capacitors (electrochemical capacitors), electric double layer capacitors, (yellow) gold capacitors, energy storage capacitors or farad capacitors, are new types of power electronics that have emerged with breakthroughs in material science in recent years. components. It has high specific power and long cycle life, can charge and discharge instantaneously with large current, and also has the characteristics of safety, reliability and wide application range, so it has unique application advantages in many occasions. Supercapacitors can be used as a backup pow...

AI Technical Summary

Problems solved by technology

[0017]Conventional supercapacitor production usually adopts wet method, that is, conductive agents such as micropowder porous carbon and carbon black with high specific surface area and organic adhesive are used in water or organic solvent Mix the slurry and apply it on the metal collector to make an electrode; although this method is simple and feasible, due to the inhomogeneity of the microscopic pore structure of the porous carbon, in which large and medium pores account for the majority, coupled with poor electrical conductivity, etc., super The utilization rate of the actual effective pores of the capacitor is low, and the specific capacity of the electrode material is low

At present, the BET specific surface area of ​​ultra-high specific surface area porous carbon materials can reach about 3500m2 / g, but due to the low utilization rate of BET specific surface area of ​​carbon materials, the energy ratio of supercapacitors is only 0.8-3.5Wh / kg, it is difficult to exceed the bottleneck of 5Wh / kg, so how to improve the utilization of porous carbon pores is an effective way to increase the specific energy of supercapacitors