Graphene supercapacitor performance makes lithium battery shame

The author had previously said that the national policy of replacing electric vehicles with electric vehicles is to be realized. “To see the development of smart electric vehicles, I would like to talk about these issues and introduce the progress of this technology:

1, the cost problem

Using SiO2 template, and then using CVD process with CH4 as a carbon and nitrogen source, grow graphene material, and then use hydrofluoric acid to etch away the template, to obtain a process of three-dimensional graphene block material, indeed the cost is too high for industrial production is unacceptable. Can other existing mature technologies be used to reduce costs?

The

I think it is possible. For example, a graphene aerogel three-dimensional block is prepared at low cost using graphene microplates using a sol-gel process. A large number of research literatures have disclosed this technology. The three-dimensional graphene aerogel preparation technology studied by Prof. Gao Chao of Zhejiang University is an example of this kind of technology. The clockwork orange article also pointed out: "3D graphene foam has a large specific surface area, and a correspondingly good three-dimensional conductive network. Using such a current collector will bring a lot of material addition to the performance. The Institute of Metals of the Chinese Academy of Sciences has a lot of work to refer to.

The

However, the key to achieving low cost using the sol-gel method is how to prepare graphene microchips at low cost.

The

The chemical liquid phase mechanical stripping method is widely used to prepare two-dimensional oxidation state graphene microchips. The cost is high. There are also significant impacts on the environment due to the use of chemical materials. The graphene reduction process requires long-term conductivity reduction, and the two-dimensional microchips are easy to adhere. Bound into groups and so on. A physical liquid phase mechanical stripping method for preparing intrinsic reduced three-dimensional graphene microchips is low-cost, environmentally-friendly, and creates a condition for low-cost preparation of three-dimensional graphene electrode blocks by a sol-gel method.

The

2. The effect of nitriding treatment on the environment

If the concentrated nitric acid treatment nitriding process commonly used in laboratories is used in industrial production, it is indeed difficult to pass EIA.

In a national-level industrial center project, a simple, low-cost solution to nitrogen oxide pollution has been used. After BASF acquired this company to obtain this technology and other key technologies, it has been more than a decade since then and the production line is still in normal production. If the ultracapacitors of the Shanghai Silicate Institute of the Chinese Academy of Sciences are industrialized, this purification process can solve the problem of environmental impact.

The

3, the energy density problem

Energy density is the "dead space" of a supercapacitor. In order to increase the energy density of supercapacitors, a large amount of funds and manpower have been invested both at home and abroad. However, the research routes at home and abroad are basically to study new electrode materials to increase the specific capacity of electrodes, or to study composite electrodes that generate chemical reactions on the surface of electrodes. Before the supercapacitors of Shanghai Silicate Institute of the Chinese Academy of Sciences were publicized, the energy of supercapacitors was disclosed. The density problem has yet to see breakthroughs.

The need for intelligent control system technology, high-density energy storage battery technology and lightweight technology has advanced."

For intelligent control system technology, as the Internet has joined the rapid advancement, there are new reports on the automatic driving of electric vehicles on the Internet every day. With regard to lightweight technology, lightweight technology is also rapidly changing as aviation and high-speed rail industries also need this technology. It seems that the high-density energy-storage battery technology is a hindrance.

Recently, it has been reported that the Shanghai Institute of Ceramics of the Chinese Academy of Sciences has developed high-performance supercapacitors. For the time being, the journalist who does not understand technology has been used to “define 35 kilometers in 7 seconds”. However, its energy density reaches 41wh/kg (based on active substances. 63wh/kg) is indeed a big improvement over the current super capacitor 5-7wh/kg, which is worthy of praise! However, as the clockwork oranges ask: “New materials for graphene batteries in the Chinese Academy of Sciences can really fly the electric vehicle industry? This is a question that many people in the industry are concerned about.

The questions raised by this reporter are summarized as follows:

1, the cost of production;

2. The feasibility of industrialization of the preparation process, especially the environmental impact of the nitriding process;

3, the energy density is far worse than the requirements of electric vehicles, how to solve the problem.