Text/Peach Lee
When it comes to electric vehicles, I believe most people will think of these two words, one is battery life, the other is battery. In fact, these two words are bound together, in the past many people complained that even one of the reasons why they were unwilling to accept electric vehicles was that the endurance of electric vehicles was too short, and "endurance anxiety" was a label attached to electric vehicles for a long time, but with the advancement of technology, the current range of electric vehicles has been greatly improved, and this is mainly brought about by the breakthrough of battery technology. Buy an electric car in addition to looking at the appearance of accessories, look at the price, the other one has to look at the battery.
I believe that many people may hear about battery-related topics when considering starting an electric car, such as ternary lithium batteries, as well as 811 ternary lithium batteries and other strange things, if you do not understand these, then when buying a car may be more confused. So today we will briefly talk about ternary lithium batteries and "811", so that everyone has a basic understanding of it.
First of all, we all know that the battery is divided into positive and negative electrodes, of which the positive electrode material is the core material of the lithium battery, which determines the performance of the battery. Cathode material has a direct impact on the final energy density, voltage, service life and safety of battery products, and is also the most expensive part of lithium batteries, so batteries are often named after the name of the cathode material, such as the ternary lithium battery we mentioned is a lithium battery that uses ternary materials as the positive electrode.
Here we briefly talk about what the ternary lithium battery refers to. Ternary lithium batteries generally refer to batteries with positive electrode materials for NCM or NCA, that is, nickel-cobalt-manganese or nickel-cobalt-aluminum batteries, and the ternary lithium batteries used by most domestic new energy vehicle companies are mainly nickel-cobalt-manganese (NCM) batteries.
In the cathode material of ternary lithium batteries, these three metal elements each play a different role. Nickel can improve the volume energy density of the battery, is the main breakthrough to improve the mileage; cobalt plays a role in improving stability and prolonging the life of the battery, but also determines the battery charge and discharge speed and efficiency (magnification performance); manganese / aluminum is to improve the safety and stability of the battery. In actual use, according to the actual needs, the mixing ratio of the three can be appropriately adjusted to make the lithium battery show different characteristics.
So what is "811"? Above we said that ternary lithium batteries contain three kinds of metal elements, they are mixed together according to a certain proportion can make the characteristics of the battery change to a certain extent, so "811" refers to the proportion of nickel, cobalt, manganese three elements, and because of the high nickel content, NCM811 lithium batteries are also known as high nickel ternary lithium batteries.
According to the different proportions of nickel, cobalt and manganese, nickel, cobalt and manganese ternary lithium batteries can be subdivided into 111 type, 523 type, 622 type and 811 type, etc., and now mostly 523 and 622 type. Because nickel can improve energy density, improve endurance, and the price of cobalt is getting higher and higher, we naturally prefer to increase the proportion of nickel and reduce the proportion of cobalt; but with the increase of nickel content, the stability of the cathode material will become lower, and the safety of the battery has become the biggest limitation, so 811 is still a key direction of research.
At present, NCM811 battery has a number of spontaneous combustion incidents, its safety has been questioned by the majority of consumers, but there are rumors that the Ningde era will choose to give up the NCM811 battery, but the comprehensive performance of the ternary lithium battery is obviously more in line with the needs of the market, THE NINGDE era also firmly stated that it will not give up the 811 battery, any technology needs a perfect process, I believe that with the improvement of technology, the ternary lithium battery will have more room for use.
summary:
Here to give you a brief introduction to the ternary lithium battery and some related things, I hope to let the majority of consumers have a deeper understanding of electric vehicles, follow-up authors will continue to bring you other knowledge related to electric vehicles, so that everyone in the choice of electric vehicles more clear about their choice of how to choose the car.