Graphene liquid phase preparation method breaks through the bottleneck

Recently, positive information about the graphene industry has been spreading from the capital market, and the market development of graphene industry has been "boosted" by many parties. The bottlenecks encountered by the mass production of graphene have been gradually overcome by relevant r&d teams.

Authorities from the ministry of industry and information technology said on sept 28 that the country will support the development of the graphene industry through various means, including the upcoming guidance on the development of the graphene industry, the creation of an industrial joint innovation center, and the establishment of an industrial development alliance by the ministry of industry and information technology. The country's first graphene and advanced carbon materials characteristic industrial base was approved recently and will be set up in Qingdao. At the same time, the government has set up a 100 million yuan graphene-related project investment fund. On the day of the news, graphene concept stocks were active, rising against the trend. Five graphene plate concept stocks realized large single fund inflow, which was good for the capital market. However, it has to be admitted that there is a technical bottleneck of mass production of graphene in industrialization.

The 'veil' of graphene

Both the capital market and the new energy market, graphene has attracted wide attention. The main reason is that as an innovative material, graphene itself has extraordinary electrical conductivity. Its application prospect mainly includes the field of new material battery. When the price of silver reaches 2,987 yuan/kg today, if silver can be effectively replaced by graphene as a conductive material, the manufacturing cost will be greatly reduced. The main reason graphene is not widely used today is the technical bottleneck of mass production.

Due to the late start of graphene related research, large-scale academic research on graphene began in 2010 when the relevant research experiment on two-dimensional graphene materials won the Nobel Prize in physics. At present, most graphene production is for laboratory use, and the commercial industry always faces the bottleneck of uncontrollable cost. Recently, professor liu jianhong from the school of chemistry and chemical engineering of shenzhen university and his research and development team have made great breakthroughs in the application of graphene battery materials, ultra-fine powder materials, conductive materials and other fields, and have realized small-scale production and market application of graphene. So far, ten core patents have been applied.

The liquid phase preparation method breaks through the bottleneck

Graphene is a structure in which graphite is stripped of a single layer of carbon atoms thick. According to professor liu jianhong, there are two main ways to prepare graphene in the market. One is chemical vapor deposition CVD method, which mainly USES chemical reaction cooling deposition to deposit graphene. Due to the weak controllability of chemical reaction and the unstable number of layers of graphite microchips formed by deposition, it is difficult for the prepared graphite microchips to meet the structural requirements of graphene. The second method is the REDOX method, in which strong oxidizer separates the links between layers in the graphite multi-layer structure to get graphene. This method is recognized by the market, but it cannot accurately separate the graphite layer, and the chemical reaction will destroy the graphene structure, so the produced graphite microchip is difficult to meet the market requirements.

Liu jianhong's team developed a chemical liquid phase method to solve the problem that graphene structure is not complete. The method is directly sintered from a liquid polymer to graphene through a series of thermochemical reactions. It was found that the structure of the graphene produced by chemical liquid phase method was completely consistent with the internationally recognized single-layer graphene structure. "Only a complete graphene structure can achieve its extraordinary electrical conductivity." Professor liu jianhong said, "the development of graphene industry should focus on the electrical conductivity. If we abandon the development of electrical conductivity due to the technical bottleneck and develop thermal conductivity instead, it is not in line with the market trend to use high-cost graphene to achieve the effect of resistance heating." At present, shenzhen dynamic innovation technology enterprise founded by liu jianhong's research and development team, shenzhen amway industrial Co., ltd. and GEM Co.,Ltd (002340SZ) have set up a joint venture company, focusing on promoting the industrialization of graphene technology achievements in the fields of new energy, ultra-fine powder and conductive materials.

Liu jianhong: the graphene new material industry should be developed according to the requirement of industry 4.0

The concept of industry 4.0 era was first put forward by Germany, which means that the industrial world will usher in the fourth industrial revolution marked by highly digital, networked and self-organizing production. The state council issued the "made in China 2025" plan in May this year, marking that China's manufacturing industry is entering the industry 4.0 era. Professor liu jianhong told China business news: "the research and development team has been implementing the idea and requirements of industry 4.0 throughout. "During the research on the industrialization of graphene, the research and development team had a detailed discussion on digital cost control, market size and return on investment.

In addition to graphene structural particles, copper and cuprous nanoparticles coated with graphene that can be used as antifouling coatings for Marine ships, as well as oxygen reduction catalysts supported by graphene, the research team has put into the market. It is known that the main development prospect of oxygen reduction catalyst supported by graphene is in the application of aluminum air battery. After using the oxygen reduction catalyst with graphene as the carrier, the current density of the aluminum-air battery was greatly increased, and the shortage of silver oxide as the catalyst with short service life and easy to be disturbed by carbon dioxide in the air was solved.

Experts in the industry believe that the concept of aluminum air battery from the laboratory development to comprehensive testing and mass production is still a long time, but aluminum air battery in new energy vehicles, mobile phone batteries, yacht energy storage industry related development is immeasurable.

The page contains the contents of the machine translation.