18650 li ion rechargeable battery

　　Briefly describe new breakthroughs in 18650 li ion rechargeable batterycatalysts

　　But what the author wants to emphasize is that the results of these forward-looking technologies are still a long way from industrialization. Of course, this does not mean that the research of domestic experts is divorced from industrialization, but that lithium batteries themselves are still far away from the next generation of battery technology.

　　The current domestic consensus is that in the near future, 300wh/kg will be achieved through high-nickel ternary cathodes and silicon-carbon anodes; in the mid-term (2025), it will be based on lithium-rich manganese-based/high-capacity Si-C anodes to achieve 400wh/kg per unit; in the long term It is to develop lithium-sulfur and lithium-air batteries to achieve a single specific energy of 500wh/kg.

　　Among them, the recent high-nickel ternary/silicon-carbon anode system actually already exists. Silicon-carbon anode materials and 811 ternary cathode materials have even formed a certain industrial scale. However, in practical applications, no domestic car company has yet mass-produced it. It is impossible to produce electric vehicles with batteries of this system, let alone achieve large-scale production.

　　In other words, in the "consensus" of domestic experts, the goals of 300wh/kg, 400wh/kg, and 500wh/kg are to be achieved, not to be applied on a large scale. Therefore, the lithium battery technology predictions frequently reported in the media and forums will require another discount for consumers.

　　In fact, most of the power batteries of electric vehicles currently driving on the road are still the 523 three-component system that appeared many years ago. Therefore, from the application side, the most urgent improvement is not the innovation of lithium batteries (it is useless to rush), but how to maximize the use of the power batteries of the current system.

　　But having said that, in the long run, the forward-looking lithium battery technology is directly related to whether the domestic new energy industry can achieve overtaking in corners, because even if autonomous driving is achieved, the importance of the power system will not change.

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

　　1. Low-cost carbon-based electrocatalysts significantly increase the energy density of fuel cells

　　According to foreign media reports, a research team from the University of Surrey and Queen Mary University of London has produced a low-cost carbon-based electrocatalyst. This product can be used in anion exchange membrane fuel cells. This catalyst helps to increase the energy density of fuel cells. to 703mW/cm2. In comparison, the earlier energy density in this field was only 50mW/cm2.

　　This type of catalyst uses cheap halloysite as a template, and uses urea and furfural as its nitrogen source and carbon source respectively. Furfural is an organic chemical that can be made from oats, wheat bran or sawdust. The above materials are then processed into black fine powder and used as nitrogen-doped carbon electrocatalysts.

　　Comment: Fuel cell catalysts have always been the focus of research in the field of fuel cells. After all, the cost of platinum electrodes is too high, and the low power of fuel cells that many people criticize is also due to lower costs and reduced platinum usage (the power density of fuel cells can be determined by the non-linearity of platinum electrodes). Linear superposition), for fuel cells to be truly applied on a large scale, new catalysts are essential. In addition, life is also a major constraint for fuel cells. However, looking at this research, the raw materials for the new catalysts are all from crops, which has an inexplicable and unreliable rustic flavor (reminding me of those reports that using crops to research lithium batteries ended up in vain).

　　2. New technology makes lithium batteries rejuvenate

　　Citing Straitstimes news, researchers at Singapore's Nanyang Technological University achieved the recovery of 95% of the available capacity of lithium batteries within 10 hours by adding battery electrodes. Specifically, the new technology uses new electrodes to remove "impurity" substances that affect battery performance, allowing the battery performance to be restored.

　　If this technology can be commercialized, it will be of great benefit to the electric vehicle industry. At present, the number of cycles of lithium batteries used in electric vehicles is still unsatisfactory. After a few years of actual use, the battery capacity loss is considerable. The cost of replacing batteries has increased the cost of vehicle use. New battery repair technology can greatly reduce the frequency of battery replacement and improve the performance and cost-effectiveness of electric vehicles.

　　Comment: In fact, the author can't imagine the principle at all. Impurities in the battery can be removed within 10 hours by adding pole pieces, and 95% of the battery's capacity can be restored. It was as if someone suddenly came over and said that he had hybridized a kind of rice that could remove impurities from the human body one month after eating it, making a 60-year-old person rejuvenate to 30 years old. In fact, the process of lithium battery capacity attenuation is a process of continuous accumulation of small deviations. The only way to go back to the past so easily is to brag.

　　3. The new negative electrode material can achieve 300 charges and discharges in 2 minutes.

　　The Korea Institute of Science and Technology announced that it has teamed up with Seoul National University to use lithium-rich manganese nickel cobalt manganese oxide (LMR) materials to create a new anode material that can overcome surface thermalization. The technology could improve the performance of electric vehicle batteries. The research results were published in the international academic magazine NanoLetters.

　　LMR materials have higher energy density and greater safety than other anode materials. However, during charge and discharge, the crystal structure will be unstable. This phenomenon mainly occurs on the surface of the anode material particles, which has limitations in commercial applications. Korean technology stabilizes the surface of the LMR anode material, thereby forming a surface structure that quickly conveys lithium ions, suppresses material thermalization, and makes the production process simple and convenient.

　　Research results show that the new material maintains its original characteristics when subjected to more than 300 high-speed charges and discharges within 2 minutes. This technology can shorten charging time and increase driving distance. At the same time, the synthesis method and improvement plan of anode materials can be applied to the next generation of electric vehicles and medium and large energy storage systems.

　　Comment: More than 300 high-speed charges and discharges are performed within 2 minutes, which means one charge and discharge takes an average of 2.5 seconds. The actual charging is about 1 second? This is no longer the fast charging and flash charging often mentioned in the industry. The author suddenly remembered that half a year ago, a Japanese research institute claimed to develop black technology that can fully charge the battery in one second. Perhaps it used the same method as this Korean research. Of course, the method I am talking about here does not refer to technology, but to a measurement method that is divorced from reality, that is, a complete battery system is not really formed for experiments.

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