3.7 volt battery 18650

With the strong rise of new energy, how can domestic 3.7 volt battery 18650 make breakthroughs?

In new energy vehicles, 3.7 volt battery 18650 are the most core component and account for a high proportion of the value of the entire vehicle. In recent years, the development of new energy vehicles has led to the development of automotive 3.7 volt battery 18650, especially the development of domestic batteries and key battery material technologies. So what is the current development status of domestic power lithium-ion batteries, how can its key material technologies be broken through, and what is the future development direction? Yue Min, chairman of Shenzhen Yanyi New Energy Materials Co., Ltd., gave a detailed explanation at the Second China International New Energy Vehicle Whole Industry Chain Summit Forum and Intelligent Connected Vehicle Development Strategy Summit on August 30. Since 2014, my country's support policies for the new energy vehicle industry, including direct subsidies, have been implemented, driving domestic new energy vehicles into a rapid development path. The growth in sales of new energy vehicles has significantly increased the demand for 3.7 volt battery 18650. In terms of shipments, in 2018, domestic battery company CATL ranked first in terms of installed power battery capacity of 24.0GWh. Panasonic followed with shipments of 22.0GWh. Although domestic companies are in the leading position in terms of shipments, and the shipments of Panasonic and other companies are decreasing, from the perspective of power lithium-ion battery technology, Panasonic, Samsung SDI, LG Chem and SKI still dominate. Especially in terms of high energy density and advanced battery technology, Japanese companies have outstanding leading advantages. Yue Min believes that it will be difficult for Chinese companies to catch up within 2 to 3 years. In terms of the application of iron lithium and artificial graphite, Chinese companies represented by CATL and BYD now have many advantages. He also mentioned that a lot of money is pouring into the field of power lithium-ion batteries, but in his opinion, for 3.7 volt battery 18650 to do well, it is not enough to have funds, but also requires talents with a full understanding of the industry. "The era of simply poaching a few people and trying to make 3.7 volt battery 18650 is over." He said in his speech. To be honest, China's battery companies have made rapid progress in recent years, but there are also some problems. Yue Min gave an example, "First of all, China's battery companies are a bit eager for quick success and quick gains, and there are many things they have not yet figured out before jumping into it. Secondly, they lack awareness and long-term thinking about the nature of the industry, future trends, consumer needs, and habits. They swarm and follow the trend. And, most importantly, domestic companies often lack real respect for the market and consumers, lack a deep respect for human nature, and do whatever it takes to make money, and do not dare to do anything in order to receive subsidies. "Contrary to our domestic enterprises, where the subsidies are, the business is not used. Japanese and Korean power battery companies often started technology pre-research and product development many years ago. They pay more attention to the needs of the market and consumers and do not pay attention to the needs of the market and consumers. It is moved by immediate interests and short-term interests and is not subject to adjustment by policy changes. Yue Min pointed out that these Japanese and Korean power battery companies are patient, know how to give up, and have profound technical accumulation. Their automotive batteries have reached a stage where they can be commercialized. He took the Tesla he bought three years ago as an example. That Tesla has traveled 100,000 kilometers, but the battery has not degraded for less than 30 kilometers. The four key main materials of 3.7 volt battery 18650 3.7 volt battery 18650 have four key materials, which are negative electrode materials, positive electrode materials, electrolytes and separators. Yue Min believes that Chinese companies must have the final say in lithium-ion battery materials in the future, because Chinese lithium-ion battery material suppliers have achieved a leap from "imitation-follow-up-catch-up" and are now in the process of "catching up" one after another. on the way. In terms of cathode materials, domestic enterprises are forming a trend of "catching up from behind" in terms of both technology and scale, and their future development prospects are promising; in terms of anode materials, domestic enterprises have comprehensive leading advantages, and their industry status has been established, and it will be difficult to be replaced in the short term. Beyond; in terms of electrolyte, because patents and core additives are controlled by foreign companies, and the formula is controlled by the client, domestic electrolyte manufacturers have actually become OEMs; in terms of separators, domestic companies have slow technological progress and new systems If no breakthrough has been achieved and the problem cannot be fundamentally solved, the industry needs disruptors. For example, Yue Min said that in order to improve the thermal stability of the separator and its wettability to the electrolyte, domestic companies generally apply a layer of ceramic or organic glue on the separator, and the most may even apply 5 layers. Although after coating Performance will be improved, but it will also take up battery space and increase battery weight. In addition, although battery auxiliary materials are very important, they have not been taken seriously by domestic companies. Therefore, auxiliary materials have been monopolized by foreign companies for a long time and are most likely to get stuck. Now many domestic battery material suppliers have started to develop. Suppliers that have grown up with CATL include cathode material suppliers Dangsheng Technology and Xiamen Tungsten Industry; anode material suppliers Jiangxi Zichen and Kaijin Energy; electrolyte material suppliers Shangtianci Materials, Xinzhoubang and Jiangsu Cathay; separator material suppliers Shanghai Enjie and Xingyuan Materials. At present, the main suppliers of Japanese and Korean battery companies are still Japanese and Korean material companies. Although they have certain advantages over domestic companies in terms of quality, the procurement costs are higher. As the production technology of domestic material suppliers continues to optimize, Japanese and Korean companies We have also begun to introduce domestic suppliers of key main materials. For example, Panasonic has imported Xiamen Tungsten Industry as a supplier of positive electrode materials; as a supplier of negative electrode materials, it has imported Beterui and Jiangxi Zichen, etc. How to make breakthroughs in key material technologies In Yue Min's view, technological breakthroughs in key materials should mainly depend on application scenarios, and then decide how to break through technical bottlenecks based on the application scenarios. For example, new energy vehicles will be the mainstream trend in the future, and people are talking about new energy vehicles with long driving range. But what kind of new energy vehicles are the most practical for consumers? He believes that if it is used as a city scooter, there is actually no need to pursue a new energy vehicle with a cruising range of more than 500 kilometers, because we usually do not travel more than 200 kilometers back and forth to work, and a too long cruising range will only increase the cost. Therefore, Yue Min believes that new energy vehicles should be more appropriately divided into national cars and high-end cars. If divided in this way, 3.7 volt battery 18650 will include lithium iron phosphate batteries suitable for national cars and ternary lithium batteries suitable for high-end cars. "Based on this judgment, we can draw the mainstream direction of cathode materials. One is lithium iron phosphate, which solves safety and cost issues and is suitable for national cars; the second is high-nickel cathodes, which solves cruising range and cost issues and is suitable for high-end cars." Yue Min express. The technological breakthrough of high-nickel cathode materials lies in the short-distance process to solve the cost problem, specifically shortening the process from mines to ternary materials; of course, cross-border innovation is also needed to solve safety problems and solve them systematically rather than through a single approach. , because it is impossible to completely solve the problem through a single approach; it is also necessary to have a craftsman spirit and carefully study process and engineering issues; and finally, it is necessary to achieve very little cobalt or no cobalt to further reduce costs. The technological breakthrough direction of lithium iron cathode materials is: first, short-range to solve the cost problem; second, the need for integrated technology; third, high energy density, the electrode plate density needs 2.8g/cc; fourth, LFP supplement The application of lithium additives is the key to the energy density of lithium iron batteries reaching 200~220wh/Kg. In terms of technological breakthroughs in anode materials, for carbon anode materials, it is necessary to improve the performance of natural graphite and artificial graphite and reduce their prices; for Si-based anode materials, it is necessary to completely subvert their process technology, starting from the equipment, it is necessary to take into account recycling Utilization issues. In the end, through cross-border integration and innovation, SiOx and nano-silicon were reduced to less than 40,000/ton. For other types of anode materials, it is not currently applicable or cannot be commercialized. In terms of breakthroughs in diaphragm technology, the function of the diaphragm is mainly to conduct ions and isolate electrons. The current pain point faced by customers is that the safety factor is not high enough, which limits high energy density design. The solution is to solve it essentially, rather than passively. It would be better to apply it directly without coating rather than needing to apply multiple coats like now. In addition, battery auxiliary material technology is actually a forgotten core key that determines the overall performance of the battery. In general, the ideas for technological breakthroughs in key materials for 3.7 volt battery 18650 include functionalization of materials and short-term processes; systematic and integrated development; cross-border integration and innovation; and simplification. Yue Min emphasized that there is no shortcut to technological breakthroughs, and it can only rely on continuous accumulation and accumulation. The development direction of 3.7 volt battery 18650. For now, lithium-ion batteries are the best choice for new energy vehicles. In the short term, it will be difficult for other batteries to replace them and become mainstream. All-solid-state batteries, while nice to have, are not available yet. In his opinion, 350wh/Kg may be the critical point of PK between fuel vehicles and new energy vehicles. Regarding fuel cells, Yue Min lamented, "It is estimated that it will be difficult for me to see fuel cells being truly commercialized in my lifetime. It sounds like a good thing, but a series of problems such as conversion efficiency, resources and safety need to be solved, and each The problems are very difficult to solve." Finally, he concluded that from the fact that lead-acid batteries and alkaline batteries have not been replaced after such a long period of development, it can be seen that lithium-ion batteries still have at least 30 years of development, " We do not exclude new technologies and new things, but we still have to be realistic. Lithium-ion batteries have been developed for decades and have already laid a certain foundation and accumulation. We still need to sink in and focus on lithium batteries, which will be more beneficial to promoting the development of new energy. Practical significance.”

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