18650 battery 1800mah phosphate battery fast charging technology, can 18650 battery 1800mah phosphate be fast charged?

　　18650 battery 1800mah phosphate battery fast charging technology, can 18650 battery 1800mah phosphate be fast charged? As the most important technical path for the development of new energy vehicles, fast charging has a significant effect in alleviating range anxiety and reducing charging time. Therefore, it has become the market choice of many car companies and battery companies. The core of fast charging technology is to accelerate the movement of lithium ions in the positive and negative electrodes through the design of the chemical system without affecting the life and safety of the battery cells. Many fast charging technologies are optimized around this point. So can 18650 battery 1800mah phosphate be charged quickly? What is 18650 battery 1800mah phosphate battery fast charging technology?

　　18650 battery 1800mah phosphate battery fast charging technology

　　Fast charging and slow charging are relative concepts. The industry generally believes that fast charging of electric vehicles refers to a charging method with a charging current greater than 1.6C, that is, a technology that charges from 0% to 80% in less than 30 minutes. If we compare the 18650 battery 1800mah phosphate battery to a rocking chair, the two ends of the rocking chair are the poles of the battery, and the lithium ions are like excellent athletes, running back and forth on both ends of the rocking chair. When charging, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon used as the negative electrode has a layered structure and has many micropores for the insertion of lithium ions reaching the negative electrode. The more lithium ions embedded, the higher the charging capacity. During fast charging, lithium ions need to be accelerated and instantly embedded into the negative electrode. This poses a great challenge to the negative electrode's ability to quickly receive lithium ions. Batteries with ordinary chemical systems will produce by-products in the negative electrode during fast charging, which affects the cycle and stability of the battery cell.

　　Therefore, the core of the fast charging technology of 18650 battery 1800mah phosphate batteries is to accelerate the movement of lithium ions in the positive and negative electrodes through chemical system and design optimization without affecting the life and reliability of the battery cells. The diffusion and movement of lithium ions in the positive/negative electrode is like running a 100-meter race. We want the runways to be wide enough and not crowded. How to widen the channel?

　　To this end, CATL uses "fast ion ring" technology on the surface of the negative electrode graphite, which is equivalent to creating a high-speed track on the surface of the graphite, greatly accelerating the embedding of lithium ions in the graphite layer. The modified graphite has both super fast charging and high performance. Energy density properties.

　　Can 18650 battery 1800mah phosphate be charged quickly?

　　Some people say that 18650 battery 1800mah phosphate is not suitable for fast charging because its conductivity is not good enough and it easily generates heat during fast charging. But this is only for pure-phase 18650 battery 1800mah phosphate materials. After grain refinement, surface carbon coating, and unit cell element doping, it has good ion and electron migration rates and is suitable for fast charging. 18650 battery 1800mah phosphate has the characteristics of high safety, high thermal stability and long cycle life, making it a good choice for fast charging. According to experts, there are two sides to this issue. From a material perspective, the intrinsic conductivity of 18650 battery 1800mah phosphate materials is relatively low, only one percent of that of ternary materials. The conductivity of 18650 battery 1800mah phosphate materials needs to be optimized to meet the needs of fast charging.

　　Experts said that after CATL's transformation, 18650 battery 1800mah phosphate batteries are no longer "the original 18650 battery 1800mah phosphate" and are even better than ternary materials. On the positive electrode, CATL has developed "superconducting electronic network" technology, which enables 18650 battery 1800mah phosphate to have excellent electronic conductivity, up to 1,000 times that of ternary materials.

　　He pointed out that the current cycle performance of 18650 battery 1800mah phosphate fast-charging batteries is better than that of non-fast charging batteries. In principle, there is no contradiction between cycle performance and charging. So why are traditional batteries not good when used for fast charging cycles? That's because traditional batteries are not designed for fast charging. There will be by-products or side reactions during fast charging. When there are too many side reactions, the cycle will naturally deteriorate. Once the dynamic problem of fast charging is solved, its cycle will at least not get worse. At the same time, fast-charging batteries not only have higher kinetics, but also have lower energy density than non-fast-charging batteries. It is not surprising that the energy density is lower and there is more electrolyte, so the cycle becomes better. In fact, the 18650 battery 1800mah phosphate fast-charging battery they are currently developing can reach 10,000 cycles.

　　On the surface of the negative electrode graphite, CATL uses "fast ion ring" technology to modify it. The modified graphite takes into account the characteristics of super fast charging and high energy density. During fast charging, the negative electrode no longer produces by-products, so the lithium ions in the graphite layer are greatly improved. The embedded speed enables it to have 4-5C fast charging capability, achieve fast charging in 10-15 minutes, and ensure an energy density of more than 70wh/kg at the system level, achieving a cycle life of 10,000 times.

　　Also as a representative enterprise of domestic 18650 battery 1800mah phosphate batteries, Shenzhen Waterma Battery Co., Ltd. is the first national high-tech enterprise in China to successfully develop new energy vehicle power batteries and the first to achieve large-scale production and batch application.

　　In an interview, Xu Hui, director of Waterma Battery Cell Research Institute, revealed Waterma’s unique skills in fast charging. On the positive electrode, Waterma uses 18650 battery 1800mah phosphate with a smaller particle size. Currently, the common 18650 battery 1800mah phosphate particle size on the market is between 300 and 600nm, while Waterma only uses 18650 battery 1800mah phosphate with a particle size of 100 to 300nm. In this way Lithium ions will have faster migration speeds and can charge and discharge at higher rates of current.

　　At the negative end, artificial graphite with smaller particle size is also used for carbon coating: the small particle size is conducive to the detachment and insertion of lithium ions; the carbon coating can optimize and improve the cycle life of the battery, and the microporous carbon structure is conducive to The adsorption and retention of electrolyte thus play a role in improving cycle life.

　　Every 18650 battery 1800mah phosphate battery of the same design has a "healthy charging range". The chemical system of fast-charging batteries has been specially optimized. Its "healthy charging range" is larger than that of slow-charging batteries and can withstand the maximum charge. The current is naturally larger than that of slow-charging batteries. The battery has an effective volume, and generally the effective volume is reached when it reaches 95%. If the battery is fully charged every time, the battery will be in a full working state, and the battery will be very tired in the long run.

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