What are the advantages of 811 battery?

In recent years, my country's power battery technology level has grown rapidly, and the cost has also been reduced. In terms of positive electrode materials, it is now gradually moving towards high-nickel ternary materials. Recently, everyone is talking about 811 batteries; in terms of negative electrodes, electrolytes, films and other materials have been produced. We hope that the energy density can reach 300WH/kg before 2020. At a recent meeting, Huang Shilin, vice chairman of Ningde Times, made such a speech. In previous media reports, CATL is expected to launch the 811 battery next year. Similarly, BYD also has such a plan. NCA technical barriers are high, and the material is almost monopolized by Japanese companies. The ternary lithium battery is a lithium battery that uses nickel and cobalt as the positive electrode material and uses manganese or aluminum salts to stabilize the chemical structure. NCM means that the positive electrode material is composed of three materials of nickel, cobalt and manganese in a certain proportion, while the positive electrode material of NCA is composed of nickel, cobalt and aluminum, and each letter corresponds to the chemical initial of the relevant element. Because these two types of lithium batteries have relatively higher energy density and can balance battery life and stability, they have become the first choice for electric vehicle batteries. So, what are the advantages and disadvantages of the two batteries? Nickel-cobalt-aluminum battery requires high manufacturing process and high cost, but aluminum can play a role in improving the chemical stability of the battery cycle. When combined with the ternary system, the nickel content can be increased to a certain extent, thereby achieving higher battery energy density . However, the crystal structure of nickel-cobalt-aluminum is more unstable than that of nickel-cobalt-manganese. It is prone to collapse at higher temperatures and cause thermal runaway, and too high a pH value will easily cause the monomer to swell and cause danger. The manganese element in the nickel-cobalt-manganese battery is more difficult to stabilize and more nickel, resulting in a slightly lower energy density in the current nickel-cobalt-manganese system, so the battery life performance is not as good as that of the nickel-cobalt-aluminum battery. But the advantage is that the manganese-containing ternary system has better thermal stability, and at the same time the nickel content is less, so it is safer as a power lithium-ion battery. The technical barriers of nickel-cobalt-aluminum NCA battery materials are high, and the current output is mainly concentrated in Japan and South Korea, and my country's mass production is relatively small. Important suppliers include Sumitomo, Japan Chemical Industry Co., Ltd. and Toda Chemical (Toda), and South Korea’s Ecopro and GSEM also sell a small amount of products. The 811 battery has gradually become a domestic trend, but the safety problem must be solved. From the perspective of energy demand, the NCA battery does have more advantages. However, considering the manufacturing process, cost, and current technical conditions, my country's battery companies are still focused on processing NCM. In NCM batteries, according to the content of nickel, cobalt and manganese, NCM materials can be divided into NCM111, NCM523, NCM622, NCM811, etc., where the following number represents the ratio of nickel, cobalt and manganese. From the perspective of industry trends, the current domestic mainstream power cathode material is NCM523. However, due to the increasing requirements of electric vehicle manufacturers for battery cruising range, domestic power lithium-ion battery manufacturers have also focused on the high nickel ternary direction. Because as the nickel content increases, the specific capacity of the ternary cathode material gradually increases, and the energy density of the battery will also increase. On the other hand, and the price of cobalt, which is a rare metal, continues to rise, the high-nickel system NCM811 will become an important development direction in the future. At present, the NCM811 material technology is gradually mature, and the production is gradually released, forming a small batch trial. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: How to maintain lithium polymer batteries?