CR2450 battery

　　my country's CR2450 battery technology research and development has made new progress

　　The shortcoming of "range anxiety" has become a major obstacle to the further promotion and popularization of new energy vehicles, and the existing lithium battery material system will soon touch the "ceiling" of energy density. Although domestic and foreign car companies and power battery companies are optimistic about all-solid-state batteries, the industry's most optimistic expectation is that they will not be commercially available until after 2025, and it may have to wait until after 2030 for the technology to be fully mature. There is still a long way to go for all-solid-state batteries. For new energy vehicles and power battery companies, it is also very necessary to find other new lithium battery material systems that can be commercialized faster. Lithium-sulfur batteries, which combine high energy density, high theoretical specific capacity, low cost and environmental friendliness, are one of the options. However, the much-criticized "shuttle effect" of lithium-sulfur batteries has prevented them from leaving the laboratory and being applied to the field of new energy vehicles.

　　Data show that lithium-sulfur batteries are a type of lithium battery that uses sulfur as the positive electrode and metallic lithium as the negative electrode. Its theoretical specific energy is as high as 2600Wh/kg, which is much higher than currently commercialized lithium-ion batteries. In recent years, lithium-sulfur batteries have become one of the main research directions for new high-energy batteries due to their high energy density, high theoretical capacity, abundant elemental sulfur resources, low price, and no pollution of elemental sulfur. However, in the actual application of lithium-sulfur batteries, polysulfides (intermediate products) that are easily soluble in the electrolyte form a "shuttle effect", which will directly lead to poor battery cycle life. Therefore, how to inhibit the shuttle of polysulfides is crucial in the research of CR2450 battery cathodes.

　　Battery China Network learned from the University of Science and Technology of China that the team of Academician Qian Yitai and Professor Wang Gongming of the school studied the kinetic behavior of metal cobalt-based compounds in lithium-sulfur chemistry through a combination of experiments and theory, and found that cobalt-based compounds The position of the p band center of the valence electron of the anion in the compound relative to the Fermi level is the main factor affecting the kinetic properties of the electron transfer reaction at the interface of lithium-sulfur batteries. The research results were recently published in the top international energy materials journal "Joule".

　　By studying the conversion kinetic properties, the researchers found that the prepared metal cobalt-based compounds showed completely different electrochemical kinetic behaviors. DFT simulation results and simultaneous charge difference density analysis show that by trying to correlate the p band center position of the anion valence band of different cobalt-based compounds with the kinetic properties of the electrochemical conversion of polysulfide compounds, it is found that the p band center of the anion valence electron changes. The position relative to the Fermi level can effectively control the interface electron transfer reaction kinetics, thus becoming the main factor affecting the chemical kinetic properties of Li-S. This achievement will serve as a guide for the research and development of Li-S battery applications.

　　Coincidentally, Battery China recently learned from the Lanzhou Institute of Chemical Physics of the Chinese Academy of Sciences that researcher Zhang Junping's team has designed a clay mineral (hectorite) super-electrolyte lithium battery separator for the first time. Laponite contains abundant O active sites and Li+, and also has a unique lamellar structure and large specific surface. Laponite was first used in lithium-sulfur batteries to inhibit polysulfide shuttle and improve the Li+ conductivity of the separator. Research shows that the clay mineral superelectrolyte separator has a significant inhibitory effect on polysulfide shuttle, and at the same time has high Li+ conductivity, rapid Li+ transfer, superelectrolyte property and high thermal stability. When applied to lithium-sulfur batteries, it performs excellently in terms of cycle stability, rate performance and self-discharge suppression. In addition, the separator has good universality and can be prepared by a simple coating method, showing excellent performance in both LiFepO4 and lithium-sulfur batteries.

　　According to Battery China.com, the "high specific energy CR2450 battery technology" results of Professor Lai Yanqing's team at Central South University have been transferred to Central South New Energy Investment (Shenzhen) Co., Ltd. with a total cost of up to 140 million yuan. Responsible for the industrialization implementation of related technologies. It is reported that Professor Lai Yanqing, as the person in charge of the project, also applied for and was approved for the 2018 National Key Research and Development Plan project. It is expected that within 3 years of the project implementation, it will be the first in the world to realize high specific energy (more than 2 times the current battery) CR2450 battery Demonstration of engineering manufacturing and loading application.

　　Such high transfer fees are extremely rare among domestic universities, but it also reflects the current efforts of my country's new energy vehicle and power battery industry to break the "bottleneck" of new energy vehicle mileage and realize the commercial application of new materials and new technologies as soon as possible. urgent needs.

　　In addition to scientific research institutes that have invested a lot of energy in the research and development of CR2450 battery technology, some domestic power battery companies such as Mengshi Technology, Thornton New Energy and Guoxuan High-tech have also formed certain technical reserves in the research and development of CR2450 battery technology. . Battery China Network believes that with the successive breakthroughs in important CR2450 battery technologies and the promotion of the development of the new energy automobile industry, the commercialization process of lithium-sulfur batteries is expected to accelerate, and companies that take the lead in deploying related technologies are expected to seize market opportunities.

　　Technology Zone BAK Power Battery has signed a contract with a new energy company in the United States to jointly develop and produce super lithium. my country has developed a carbon dioxide battery that can fully realize green and sustainable development. Three new iPhones all support USBpD fast charging. Who is the biggest beneficiary? Volkswagen The announcement of an investment of US$100 million in QuantumScape is expected to bring solid-state battery technology to the forefront by 2025. Should we take the NCA route or the NCM route on the battery technology route?

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