Related analysis of CATL super rechargeable battery 18650 3.7v and power fast charging

　　Improving the energy density and fast charging performance of power batteries is considered to be a feasible way to relieve consumers' range anxiety.

　　Under the pressure of linking the amount of subsidies to energy density, a large number of domestic power battery companies have achieved a significant increase in energy density by improving material systems and lightweighting PACKs. It has become a norm for the system energy density to reach 140wh/kg. . However, there has been no major breakthrough in the fast charging performance of power batteries.

　　Recently, a special seminar on high-power charging pilot projects for electric vehicles was successfully held in Ningde. During the meeting, CATL demonstrated to the participants the charging process of the EnerSpeedy super rechargeable battery 18650 3.7v using the "super iron lithium + high energy density fast charging graphite" system. This product is a 60Ah super rechargeable battery 18650 3.7v that can be charged at 5C. The demonstration process took 7 minutes and 12 seconds to complete charging from 20% to 80%, and charging from 20% to 100% only took 13 minutes and 8 seconds.

　　It is understood that the system energy density of CATL super rechargeable battery 18650 3.7v 5C high-energy products is above 70Wh/kg, and the 3C high-energy products are above 115Wh/kg, with a cycle life of up to 10,000 times. At the same time, CATL has also developed a ternary system fast-charging battery that can charge SOC from 5% to 85% in 15 minutes, with an energy density of 190Wh/kg and a cycle life of more than 2,500 times. The next step is to ensure 4C fast charging, energy The density can continue to be increased to 210Wh/kg.

　　Dr. Wang, the person in charge of the CATL fast charging project, explained that the focus of fast charging is on the negative electrode, and the choice of the positive electrode, whether it is ternary or lithium iron phosphate, will not affect the performance of fast charging, as well as its reliability. .

　　Therefore, CATL is modified with "fast ion ring" technology. The modified graphite has both the characteristics of super fast charging and high energy density. No by-products appear in the negative electrode during fast charging, so the embedding speed of lithium ions in the graphite layer is greatly improved. This results in excellent rate performance, high energy density and long cycle life.

　　Judging from the results achieved by CATL, both lithium iron phosphate batteries and ternary batteries can achieve fast charging but affect product performance. This will undoubtedly greatly improve the application of lithium-ion batteries in electric vehicles and also provide other battery companies with opportunities. Learn and refer to. Among the new energy models currently in the recommended catalog, the fast charging rate of fast charging models is basically below 5C, indicating that the fast charging performance of domestic power batteries needs to be improved. Once a breakthrough can be achieved, I believe that China's new energy vehicle market will There will be a real explosion.

　　Let’s take a look at the new technologies and major events in the lithium battery industry this week.

　　1. Fujitsu uses artificial intelligence technology to develop lithium battery technology

　　Foreign media reported that Fujitsu Co., Ltd. and RIKEN announced the latest lithium battery research and development technology. The two will apply first-principles calculations (quantum mechanics) and artificial intelligence AI technology to conduct synthetic evaluations on the development of new solid electrolyte materials for lithium-ion batteries. They can also try more materials even if the information and data are incomplete. combined and verified in practice. At the same time, with the support of artificial intelligence technology, the development speed of lithium battery materials will be greatly accelerated.

　　In the development of traditional lithium battery materials, it is necessary to rely on the long-term accumulated experience and keen intuition of researchers. When trying to synthesize new materials, there is also a high reliance on data. The first-principles calculation will be based on the characteristics that can be predicted by quantum mechanics (wave function characteristics), and the best combination mode of new materials can be sensed before the experiment, thus greatly reducing the number of experimental failures. But at the same time, the load of first-principles calculations is huge, and various compositions of materials require multiple calculations, which will take a long time to develop.

　　Therefore, the research team introduced artificial intelligence AI technology so that it can control the number of calculations of first-principles calculations and more directionally predict three lithium-containing oxonate synthetic compounds for lithium-ion battery solid electrolytes. The results confirmed that this method can predict the best material combination for high lithium ion conductivity in a shorter time. At the same time, high lithium ion conductivity with greater efficiency can be found during the prediction process.

　　Comment: Combining quantum mechanics, which is good at big data calculations, with AI technology, which is good at analysis and calculation, to develop lithium battery technology. Compared with artificial brain calculations, it can indeed greatly improve the trial and error rate and success rate of research and development. At the same time, all research and development data can be integrated Integration facilitates analysis and comparison, and improves data support for the research and development of lithium batteries. If this technology is mature and applied, the development of new lithium battery technology may be accelerated, resulting in the development of a new generation of lithium batteries with higher energy density, longer life, and safer.

　　2. Graphene oxide accelerates the commercialization of organic lithium batteries

　　The lithium metal in lithium batteries can easily form dendrites after overcharging or repeated use, which can pierce the isolation layer and cause self-explosion.

　　Therefore, the University of Illinois at Chicago (UIC) and Texas A&M University (TAMU) formed a team to accelerate the solution and hope to use supercomputers to understand the chemical and physical principles of dendrite formation. Perla Balbuena, a professor of chemical engineering at TAMU, said the team's goal is to develop coatings that can protect lithium metal and slow down lithium deposition through coatings.

　　The team developed a graphene oxide (grapheneoxide) nanosheet that can be sprayed on the glass fiber separation layer of the battery. These materials allow lithium ions to flow smoothly, and can also slow down and control the speed at which ions and electrons combine to become neutral atoms. . The coating allows the atomic deposition not to be uneven like a needle, but to create a flat surface at the bottom.

　　The researchers used computer models and simulations, combined with physical experiments and microscope imaging. The results show that lithium ions will form a thin film on the graphene oxide layer, and then deposit under the graphene oxide layer through the material gap. The material gap acts like the track of a nostalgic pinball machine, which can slow down the deposition speed and guide the direction.

　　Graphene oxide can also increase battery cycle life, reaching 160 stable cycles compared to the 120 cycle life of other batteries.

　　The graphene oxide can be achieved by spraying it cheaply and affordably, but because the coating is very thin, it is a challenge to determine the location. Balbuena said that it was not possible to determine where the coating is at the microscopic level in the experiment. The coating is very thin, so it is not possible to Too much need to pinpoint its location.

　　Comment: The all-powerful graphene is here again. According to the team’s research, adding graphene oxide to lithium batteries is not only expected to solve the problem of lithium dendrites, but also increase the cycle life and safety of the battery. It is simply a “magic oil”. . But like all previous graphene battery news, the actual usefulness of this technology is still in the research stage.

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