Energy density is one of the biggest disadvantages of supercapacitors, in order to improve the energy density of supercapacitors, a lot of money and manpower have been invested in research at home and abroad, and the research route is basically to study new electrode materials to improve the specific capacity of the electrode, or to study the composite electrode that produces a chemical reaction on the electrode surface. [← 8 [← 8 [← read [← book, .2↘

Huaxing Group Co., Ltd. has a very early layout in graphene technology, and began the research and development of the preparation process and application of graphene materials as early as eight years ago.

After cooperating with Huaxing Group, Tongji University has established a national electrochemical engineering technology research center, and Aode Technology Company has also brought rich benefits to Tongji University, and Tongji University has also hired a number of chemical engineering experts and professors from overseas to undertake a lot of battery technology research projects over the years.

Of course, Meixihu University also started its chemical engineering major five years ago, but the application direction is in fuel cell technology and semiconductor materials.

On the occasion of the centenary of Tongji University this year, Song Xinyang, Li Kaiyuan and others also visited the university to inspect and congratulate, and the Electrochemical Engineering Technology Research Center of Tongji University was also on CCTV news.

Previously, the specific capacity of the carbon electrode of the supercapacitor was less than 250 farads per gram, and the highest specific capacity material is ruthenium oxide, which has a specific capacity of 900 farads per gram, but the price of ruthenium oxide is too expensive, and it is impossible to apply it on a large scale in industrial production, and the specific capacity of the three-dimensional molybdenum disulfide and polyetherimide composite material developed by Tongji University exceeds the precious metal material of ruthenium oxide.

Of course, Huaxing Group was previously in the development of microwave communication technology in the research and development of small interference to the signal, small dielectric constant, to ensure that the transmission of large data is not interfered with materials, but in the middle of the discovery of a high dielectric material, made of a thin film The working voltage of this dielectric film can reach 700 volts. (5) ∞ eight (5) ∞ eight (5) ∞ read (5) ∞ books, .←.o≈

Huaxing Group uses this material to prepare a thin film of solid polarizable material on the electrode as a polarization film, the resistance of the polarized film is far greater than the resistance of the electrolyte, and can bear the voltage far greater than the voltage of the electrolyte, this polarized film technology also greatly improves the working voltage of the supercapacitor battery, and it is very easy to reach 3V working voltage of the supercapacitor, that is to say, the energy density of the new polarized film supercapacitor battery is more than ten times higher than before!

It is precisely because of this that the energy density of supercapacitor batteries on the market after passing various tests this year has exceeded the energy density of lead-acid batteries, which is very close to the energy density of lithium batteries!

The combination of this polarized membrane technology and supercapacitor battery technology has also become a powerful tool for Aode Technology.

Huaxing Group is also developing a dielectric film that can withstand higher voltage as a polarized film used in supercapacitor batteries, which can increase the working voltage V of supercapacitors by 10V, and the energy density can be increased to more than ten times.

In order to improve the working voltage of supercapacitors in supercapacitor technology, foreign countries mainly focus on the research of new high-voltage working electrolytes, and the use of organic electrolytes can increase the working voltage of supercapacitors.

However, the preparation cost of this electrolyte is too high, and industrial production is also unacceptable.

The expert team of Huaxing Group Company also discussed it, and one of the scientists proposed the technical scheme of polarization film but was affirmed by Yang Jie, so Huaxing Group began to select a variety of high-dielectric materials for the research and development of polarization film.

Through thousands of experiments, Huaxing Group finally selected a material, mastered the polarization film process of this material for more than two years, and successfully applied it to supercapacitor battery technology, and finally made a major breakthrough in energy density of supercapacitor battery.

In terms of electrolyte, Tongji University has developed a cross-linked copolymer hydrogel composed of hectomorillonite clay and graphene microsheets as a supercapacitor electrolyte, which exhibits high mechanical elongation, excellent ionic conductivity and healing properties.

Tongji University has also developed a supercapacitor battery assembled from the electrode of this hydrogel electrolyte and folded structure, which can be stretched by external force for a long time, and can maintain more than 90% of the electrochemical performance after stretching thousands of times, and can maintain repeated healing ability under infrared light irradiation and heating, which has accumulated a lot of technical reserves for the research and development of wearable batteries.

Moreover, the preparation process of embedding graphene microsheets into the material by gelling method greatly reduces the cost compared to other processes.

Of course, the supercapacitor battery pushed out by Aode Technology Company is not cheap, mainly because the preparation process of graphene nanosheets is still too expensive, and the electrochemical research institute uses this new physical liquid-phase mechanical peeling method to prepare three-dimensional graphene microsheets.

This kind of graphene microchip has been provided to Tongji University and Aode Technology Company for use at the beginning of this year, and the effect is better than the graphene material previously provided.

The main reason is that the two-dimensional microchips provided before are easy to bond and form clumps, while this three-dimensional graphene microsheet does not have this case, but makes the previous process flow less.

Yang Jie learned that this set of process technology has matured, and he is also very happy in his heart, and then Huaxing Group will establish such a production line and start large-scale mass production to provide this graphene microchip for Aode Technology Company.

The previous single-layer graphene needs to add some functional groups for trimming before it can be used, and the oxidation of graphene introduces oxygen-containing functional groups, which breaks the large π conjugate structure of graphene, resulting in defects, resulting in a decrease in conductivity, and the subsequent reduction process is required to restore conductivity, and irreversible agglomeration will be caused in the reduction process, and due to the difference in the selection and dosage of reducing agent, it may lead to incomplete reduction, which in turn leads to certain defects in the graphene material, resulting in the R & D personnel must have a The selection and ratio of solvents and additives are tried, and a variety of different graphene solutions can be prepared.

Now the three-dimensional graphene structure prepared by this preparation process is very stable, which avoids the stacking of this tree-like polymer graphene material, and a gelatinous slurry can be obtained after adding solvent, which can be easily made into thin film materials of tens of nanometers.

Now the Institute of Electrochemistry has begun to conduct various studies on this three-dimensional macromolecular graphene material, and different progress has been made.

Huaxing Group has begun to develop this material on fuel cell electrodes, and has also begun to study this material as a filler on conductive inks to study conductivity on polyimide films, mainly for use in circuit board printing and printing RF antennas, and to replace gold contact pads and conductive silica gel.

The use of graphene polymer materials in conductive inks can replace gold and silver, and can also greatly save the traditional circuit board process, which greatly reduces the manufacturing cost of Huaxing Group. 11