Recently, the 21st China Science and Technology Forum was held in Chongqing. The theme of the forum focused on chemical energy storage materials technology. Shen Aimin, Academic Director of the China Association for Science and Technology of China Association of Science and Technology, and Wu Gang, Vice Mayor of Chongqing, attended the meeting and delivered speeches. How can energy storage materials break through the current technical bottleneck? Which new materials are most promising? How to ensure the safety of energy storage batteries? The current development of energy storage technology is relatively backward Moderator: What is the application prospect of energy storage batteries? Why does it change the way resources are used in the future? Zhang Huamin: The application of energy storage batteries is very wide, including lithium batteries for mobile phones and cameras in daily life, as well as large-scale energy storage batteries for storing wind energy and solar energy. At present, the technologies used for large-scale energy storage mainly include pumped storage, compressed air storage, flow batteries, sodium-sulfur batteries and lead-acid batteries. Relatively speaking, the use of energy storage batteries is more convenient, thanks to the material industry. With the rapid development, the prospect of energy storage batteries is bright. The reason is due to resource shortages and environmental problems. With the development of national science and technology and society, and the improvement of people's living standards, energy and environmental issues have received more and more attention. The contradiction between supply and demand in energy has become increasingly apparent. The shortage of fossil energy and environmental damage have turned the focus to wind and solar energy. Ocean can be such renewable resources. However, renewable energy such as wind, solar and ocean energy is greatly affected by weather and time periods. It has obvious instability, discontinuity and uncontrollable characteristics. It needs to develop and construct supporting electrical energy storage ( Energy storage) devices to ensure the continuity and stability of power generation, power supply, and large-scale energy storage technology used in the power industry for power peaking and valley filling, will greatly improve the contradiction between power supply and demand, and improve power generation. Equipment utilization. On the other hand, it is a future development trend. The development of new energy, smart grid and electric vehicles in the next three emerging industries will point to the same technology: energy storage materials (energy storage batteries) technology. At present, the development of energy storage technology is relatively backward. Many countries have positioned large-scale energy storage technologies as strategic technologies to support the development of new energy sources. At present, the technological development of the world's energy storage materials is very rapid. Regardless of the development level of energy storage materials technology or the transformation of achievements into the formation of advantageous industries, China has a lot of pioneering work to be carried out urgently. A battery is unified? Not too possible Moderator: There are many types of energy storage batteries, and their advantages and disadvantages are obvious. Is it possible to have a “perfect energy storage battery†to adapt to energy storage under various conditions? Wen Zhaoyin: At present, it is unlikely that a battery can be used to “unify the countryâ€. Different materials have their own characteristics to meet the needs of different conditions, such as nickel-zinc batteries and lithium batteries, which are suitable for small devices such as mobile phones. Sodium-sulfur batteries, all-vanadium flow batteries, etc. are suitable for large-scale energy storage equipment. The development of batteries for future energy storage batteries may be a situation in which all the flowers bloom. What is certain is that advances in energy storage technology will profoundly change our lives. The impact of energy storage batteries on people's lives is within reach. Problems such as the charging of mobile phone batteries every day, insufficient power consumption of tablet computers, and limited life time of notebook computers will be solved through technological innovation. The research on high specific energy materials has become a key issue in the progress of energy storage batteries. Wu Feng: Electric vehicles have increasingly entered our field of vision. It will be an important way to solve the oil energy crisis and achieve clean energy. Domestic BYD, Changan, Chery and other auto companies have already sold pure electric vehicles. The key is to develop power batteries with high energy density, low cost and high reliability. The energy storage battery for electric vehicles needs to have large power and large capacity. However, the current domestic battery has high price, the battery is heavy, the single charging mileage is not high enough, the construction of the charging station, the replacement of the power station requires a lot of land and other defects, which also greatly restricts The promotion of electric vehicles also makes consumers' purchase tendency low. In Beijing, buying fuel cars requires a lottery on the license plate; if you buy a pure electric car, you don't need a lottery. Even so, there are still very few people buying electric cars. From another perspective, we can't blindly advance, the technology maturity is low, and the lack of demonstration application experience is a common problem in domestic energy storage technology. Energy storage batteries still need revolution in high performance, high safety and high cost performance, and there is still a process of commercialization. Although in the field of energy storage batteries, China is at the advanced level in the world. In the process of large-scale industrialization, it is necessary to proceed step by step. The effect of directly promoting the promotion of electric vehicles may be poor. We need such a smooth transition, such as developing hybrid electric vehicles and accumulating more experience in practice. In the meantime, the technology will continue to improve, and now it is impossible to solve the problem, it is possible to get a better solution. Safety is more important for large-scale grid energy storage Moderator: In 2011, Zotye electric vehicles were “self-igniting†in Hangzhou; a pure electric bus in Shanghai also suffered from “self-ignitionâ€; in June this year, a traffic accident occurred on Binhe Avenue in Shenzhen, a BYD e6 pure electric taxi in the accident. After being chased, it caught fire. The safety of electric vehicles is subject to torture, so how can the safety of energy storage batteries be ensured? Wu Feng: We say that high energy and high power mean potential chemical instability. Because the problem of battery safety is not a single factor, it should be based on a comprehensive understanding of the battery reaction mechanism and its associated side reactions. Angle and system improve the safety and reliability of lithium-ion batteries. As far as the battery itself is concerned, there is room for improvement in the positive electrode material, the negative electrode material, and the electrolyte constituting the battery. Come to Xiaokang: For large-scale energy storage in the power grid, I think security is more important because it is relatively large, and it is megawatt or tens of megawatts. Small-capacity laptops are easy to burn, so big. In the future, there will be a big problem. The performance of the energy storage device itself has to be greatly improved, especially for its cost performance, safety, and high security, which we must guarantee. Liang Guangchuan: Electrolyte is a big problem. Lithium-ion electrolytes are organic and the tips are mercury. To develop a new electrolyte system with good thermal stability, flame retardancy or even non-combustibility, it is also necessary to pay attention to the matching problem of electrodes and electrolyte materials. To study a new electrolyte system with a wide electrochemical window, it is necessary to develop a new electrolyte system with high decomposition voltage. Electrolyte is now more commonly used organic solution of hexafluorophosphoric acid, we believe that replacing the electrolyte with ionic liquid may be a useful method, and has a certain scale of application, room temperature ionic liquid is non-volatile, non-flammable, high Conductive, high-voltage windows, combined to form a replacement for this liquid electrolyte, has a relatively large improvement in safety performance, which is a direction of efforts. Zhang Huamin: Finding new materials is the key to the development of energy storage batteries. The all-vanadium flow energy storage battery is one of the directions, but this battery also has its advantages and weaknesses. All vanadium redox flow batteries can be scaled to a dozen megawatts and tens of megawatts. According to our experiments, it can cycle more than 13,000 times. Another point is that unlike lithium batteries, the state of lithium batteries is difficult to detect, but the flow battery can know how much electricity can be put according to the curve, how much electricity has been released; it is environmentally friendly, the electrolyte can be used permanently, some people say vanadium Toxic, after being made into a liquid, his toxicity is relatively small. Its biggest feature is that it is safer and does not cause fire or explosion. There is a weak point energy is relatively low, about 20 watts per kilogram, its stability and reliability need to be improved. Guo Jingbin: We have another topic now, which is the safety warning system for electric vehicles. That is to say, the burning of the battery can not be stopped now, but it is possible to know in advance whether the battery has a safety hazard through a large amount of data, and how much the hidden danger is, and give the passenger an alarm in advance. This system can know in advance whether the battery has potential safety hazards through a large amount of data analysis, whether it is necessary to stop and let the guests leave. This kind of thing can't be done by our company, because the collection of large amounts of data includes modeling, the help of peers and even the support of the government. Diameter 30mm SPI 3D Tube , it also called 3d light and 3D Led Light Tube, we have different length 0.5m 3D tube, 1m 3D tube, 1.5m 3D tube and 2m 3D tube, the SPI 3D Led Tube can use for led dancing light. SPI LED Tube Light is similar DMX 3D LED Tube , but the control ic is different.
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