negative electrode

 The traditional graphite anode material has been unable to meet the needs of energy density growth, from the perspective of the anode to enhance energy density industry has also been agreed that it is the use of silicon negative electrode system.
 Talk about how to resolve the anxiety of electric car mileage from the battery point of view

 Talk about how to resolve the anxiety of electric car mileage from the battery point of view

 The specific capacity of silicon material 4000mAh / g Although high than unimaginable, but the pure silicon still can not be industrialized, mainly due to: volume expansion up to 300%, the material pulverization cycle degeneration is very serious; poor conductivity, irreversible capacity For the first time, efficiency is low.

 Therefore, it is necessary to solve the above two problems in order to make large-scale use of silicon anode materials. The best way is to form a composite material of silicon and carbon. Because carbon materials have high electron conductivity and ionic conductivity, silicon-based materials Rate performance, inhibition of silicon in the cycle of volume changes; the same time, carbon can contribute to a certain capacity. At present, the most suitable carbon as a matrix of silicon-carbon composite materials are graphite, mesocarbon microbeads, graphene and carbon nanotubes.

 Currently suitable for commercialization is divided into two types of silicon carbon composites, SiO and SiC, in order to take into account the cost and performance, need to mix with commercial negative graphite material. Commercially available Si cathode materials are mostly used in cylindrical battery system, because the tent can not reach the same level with ordinary graphite, cylindrical steel shell binding pole piece structure, the battery cycle life can be well played. Negative capacity of more than 18650-3300mAh cycle performance can be done around 1000 times.

 In addition, like the positive electrode material, it is very important to improve the loading of the active material and reduce the amount of the conductive agent and the binder.

 Diaphragm

 Diaphragm in the lithium battery plays a positive and negative insulator, ion conductor, ion conduction role, can enhance the safety of lithium batteries. As the positive and negative energy densities continue to increase, the separator performance must also be enhanced. From the diaphragm point of view to enhance the battery energy density, may not be very large, all the diaphragm companies have introduced for the high energy density battery system of 20um high safety coating membrane. From an idealized point of view, thinner but stronger and better separators are the key to enhancing and ensuring high energy density. Smaller pore sizes and more uniform pore size distribution contribute to longer cycles from the membrane's pore structure life.

 Fast charge technology

 Fast charge technology for the resolution of mileage anxiety can be said to be immediate, the following is the difference between fast charge and slow charge.
 Talk about how to resolve the anxiety of electric car mileage from the battery point of view

 As electric car battery needs more charging power, so the general charging case should be the first household 220V AC to 500V DC, the charging time is generally 6 to 8 hours. Electric car fast charge is directly to high-power DC to charge the battery in about 30 minutes can be charged to 80%. To protect the battery safety, more than 80% of the charge current must be smaller, charge to 100% takes a long time. As a result, electric vehicle manufacturers often have their own fast charging posts or fast charging stations to meet the needs of consumers due to the need for a specific fast charging device.

 Super charging station is the main push Tesla charging method, the charging speed is the fastest of the three ways, the charging voltage is 380V, charging current up to 200A, 1 hour enough to travel about 350 kilometers, the entire charging process the fastest Can be completed within an hour or so.

 Develop new advanced battery

 The next generation of higher energy density> 300Wh / kg of the battery are also under development, such as solid-state batteries, lithium-sulfur batteries.
 Talk about how to resolve the anxiety of electric car mileage from the battery point of view
 Conclusion

 With the development of battery electric control technology, I believe pure electric vehicles will become more and more popular. The problem of mileage anxiety will certainly be solved properly. Of course, this is inseparable from the industrial chain, such as battery materials, battery design, structural design, charging facilities and other aspects of joint efforts. The rest is only a matter of time.