52results about How to "Higher quality than capacitance" patented technology

The invention relates to a preparation method of carbon foam with high electrochemical performances, comprising the following steps of: firstly, weighing phenol formaldehyde, vanadate, surface active agent, sodium hydroxide and solvent according to mass ratio of 1:(0.6-4):(0.01-0.5):(1-20):(0.01-0.5):100, mixing uniformly and obtaining precursor solution of the carbon foam; putting the obtained solution into an environment with the temperature of 15 DEG C-60 DEG C to lead the solvent to be completely volatilized, and obtaining precursor of solid carbon foam; and solidifying the precursor of the solid carbon foam for 1 hour-24 hours at the temperature of 100 DEG C-200 DEG C, then rising the temperature to be 600 DEG C-1400 DEG C at the temperature rising speed of 1 DEG C / min-60 DEG C / min under the inert atmosphere, carbonizing for 0.5 hour-10 hours, and obtaining the carbon foam with high electrochemical performances. In the preparation method, the technology is simple, the quality is stable, vanadate introduced when the precursor solution of the carbon foam is prepared is converted into sodium vanadate nanocrystalline with a stable layer structure in the process of carbonization, and the obtained sodium vanadate nanocrystalline is embedded into a carbon foam skeleton uniformly. Compared with the existing carbon foam, the prepared carbon foam has the electrochemical performances such as high mass specific capacitance, good charging and discharging circulation and the like, and can be effectively applied in the fields such as electrode materials of electrochemical capacitorsand the like.

The invention discloses a metal phthalocyanine-MXene composite material, a preparation method and an application thereof. Wherein, the method for preparing metal phthalocyanine-MXene composite material comprises: (1) metal phthalocyanine is mixed with first solvent, obtains metal phthalocyanine solution; Said metal phthalocyanine solution is added into water, obtains metal phthalocyanine nanostructure (2) mixing the metal phthalocyanine nanostructure, MXene material and the second solvent to obtain the metal phthalocyanine-MXene composite material. The process of the method is simple and repeatable, and the materials used are easy to synthesize, low in price, and easy to be prepared on a large scale, which is conducive to realizing the commercialization of materials and devices. By adopting this method, metal phthalocyanine nanostructures can be introduced between MXene layers to act as interlayer spacers, thereby effectively preventing the restacking effect of MXene and increasing the electrochemically active sites on the surface of MXene, which is useful for the electrochemical redox process. There is also a significant enhancement of the ion mobility, which in turn can improve the electrochemical response to charge storage.

A kind of NiO@CoMoO 4 The preparation method of / NF capacitance electrode is based on NF, C O Cl 2 .6H 2 O, Na 2 m O o 4 .2H 2 O, glucose, and tough materials are used as raw materials, respectively, after NiO@CoMoO 4 Preparation of / NF, NiO@CoMoO 4 / NF carbon quantum dot loading, NiO@CoMoO loaded with carbon quantum dots 4 / NF toughness material wrapping and other steps are prepared. The present invention NiO@CoMoO 4 / NF has a higher specific capacitance value, and can also greatly improve the conductivity of the electrode. On the other hand, NiO@CoMoO 4 / NF electrodes are treated with tough materials, which can make NiO@CoMoO 4 The / NF electrode adapts to the volume change during the charging and discharging process, and at the same time can prevent the corrosion of the electrolyte, which ultimately makes the product cycle stable. After 10,000 charging and discharging cycles, the capacity of the present invention does not decay, and still maintains 100% of the maximum capacity. The mass specific capacitance has been greatly increased, and the mass specific capacitance of the electrode can be as high as 1457F / g at 1 A / g. The electrochemical energy storage is excellent, and it is worthy of market promotion.

The invention belongs to the field of electrode material preparation, in particular to a preparation method of an electrode material with a high-performance cabbage-shaped heterostructure. The method comprises: pretreatment of foamed nickel, 2-3mmol nickel acetate, 4-5mmo cobalt acetate, 2-3mmol sodium molybdate, 30-40mmol ammonium fluoride, 2-5g urea dissolved in 60-100ml water, stirring, Reaction, cooling, cleaning and drying obtain the prepared sample; 8-9mmol sodium sulfide is dissolved in 60-70ml deionized water, magnetically stirred for 45min, then the prepared sample is transferred to this solution, transferred to the reaction kettle, and Insulate at 80‑90°C for 12 hours, cool naturally to room temperature, wash with absolute ethanol and deionized water three times, and dry the prepared sample at 60°C for 6 hours to obtain the finished product. Solve the problems of uneven material morphology, inability to accurately control the synthesis method, poor electrical conductivity, and poor adhesion to current collectors.