The defects of super capacitor battery are as obvious as its advantages. Because the super battery has too fast discharge speed and too low internal resistance, if the planning is not good, it itself contains the risk of "sudden energy explosion". The super capacitor can discharge very quickly, and the output power can reach 24KW/Kg. A 50Kg super capacitor battery has an output power of 1200KW. If you step on the switch, the car can fly.

The self discharge speed is much faster than that of the battery, which is simply "unable to store electricity". Supercapacitor is always composed of capacitance, which is composed of two electrodes with a layer of insulating dielectric sandwiched between them. In any case, there will be electron flow between the two electrodes, which will reduce the stored power. After the super battery is fully charged, it may run out of power after a period of time.

It is not resistant to high temperature. The operating temperature of the super battery is - 40-70 ℃. It is resistant to high cold. If the temperature is too high, it will affect the operation and even damage the battery.

The important defect is still the cost. Although countries all over the world are accelerating the research and development of super capacitors Farad capacitor It is widespread in civil use, and it will take time.

Super capacitor manufacturer The defect of is that it can be overcome, and its skills are not yet mature. However, Farad capacitors are developing very fast and can be used for civilian use in the next few years. Why are they still hard to find in cars?

This is a concern of many professionals. To sum up: the cost of production; The feasibility of industrialization of the preparation process, especially the environmental impact of the nitriding process; The energy density is far from the requirements of electric vehicles. How to deal with it.

Capital problem

At present, chemical liquid-phase mechanical stripping method is widely used to prepare two-dimensional graphene oxide microchips, which is costly. There are also problems such as the use of chemical data has a great impact on the environment, the need to restore graphene treatment process has a long conductivity decline, and two-dimensional microchips are easy to bond into clusters. A physical liquid phase mechanical stripping method is used to prepare 3D graphene microchips in the intrinsic recovery state. The preparation cost is low and the environment is friendly, which provides conditions for the low-cost preparation of 3D graphene electrode blocks by sol-gel method.

2、 Influence of Nitriding Treatment on Environment

If the concentrated nitric acid process commonly used in the laboratory is selected for industrial production, it is really difficult to pass the environmental assessment. In an industrial center project, a simple and low-cost technology has been used to deal with nitrogen oxide pollution.

3、 Energy density problem

Energy density is the "dead spot" of supercapacitors. In order to improve the energy density of supercapacitors, a lot of funds and manpower have been invested at home and abroad. However, the research route at home and abroad is basically to study new electrode data to improve the specific capacity of the electrode, or to study the composite electrode that produces chemical reaction on the surface of the electrode. Before the disclosure of the supercapacitor of Shanghai Institute of Silicate, Chinese Academy of Sciences, the energy density of the supercapacitor has not seen breakthrough development.

Generally, the specific capacity of carbon electrode of supercapacitor is less than 250 farad/g. Now the known capacity data is ruthenium oxide, and its specific capacity is 900 farad/g. However, ruthenium oxide is too expensive to be used in industrial production.

As we all know, improving the operating voltage of supercapacitors can improve the energy density of capacitors, because the energy storage of capacitors is proportional to the square of the operating voltage of capacitors.

The electrolyte used for supercapacitor is mainly aqueous electrolyte. The operating voltage of water system electrolyte is generally not more than 1V, but compared with organic electrolyte, the conductivity of water system electrolyte is better (e.g. H2SO4 solution can reach 0.8S/cm), the price is lower, and it is more environmentally friendly.

progress Super capacitor module The research on the working voltage of the new high voltage working electrolyte is focused at home and abroad. The use of organic electrolyte can improve the operating voltage of supercapacitors (2.3-2.7V). It has also been reported that the ionic liquid electrolyte can be used for 3V. However, due to the high cost of preparation, industrial production is also difficult to bear.

Is there any way to improve the working voltage of supercapacitors?

Super capacitor is an illegal Lardy capacitor based on the theory of double electric layers. The electric double layer theory was proposed by Helmhotz in the 19th century. Helmhotz model assumes that the electrostatic charges on the surface of the electrode adsorb ions from the solution, and they must be spaced in a row from the electrode on the solution side of the electrode/solution interface, forming a barrier interface layer with the same number of charges as the remaining charges on the surface of the electrode but opposite signs.