What is the current status of industrialization technology research on NCA materials for 12V27A battery?

　　Current status of industrialization technology research on NCA materials

　　NCA precursor production process route

　　At present, there are three technical routes usually adopted by major domestic and foreign NCA manufacturers:

　　Among the above three processes, the Al element in the first and third solutions is added in the subsequent sintering or coating process. In this method, the Al element is unevenly distributed, and the Al content in the surface layer is high, forming an inert layer and reducing the capacity of the final product. At the same time, the process Complex and increased production costs. In the second option, the Al element can be evenly distributed, the product performance is better, the production process is simple, and the cost is low, but the preparation technology of the precursor is more difficult.

　　At present, the most mainstream technical route is the preparation process route of Ni1-x-yCoxAly(OH)2, such as Sumitomo of Japan and Toda of Japan, which have entered the mass production stage. This method generally uses sulfate as raw material, and uses sodium hydroxide and complexing agents to prepare Ni1-x-yCoxAly(OH)2, the precursor of Ni, Co, and Al co-precipitation, and then filtrate, wash, and dry it. product. The advantages of this process are low production cost, simple process, and more suitable for large-scale industrial production.

　　NCA sintering process route

　　The raw material lithium source of NCA usually uses lithium hydroxide. Since the sintering temperature of NCA cannot be too high, generally not exceeding 800°C, when lithium carbonate is used as the raw material, the thermal decomposition of lithium carbonate is incomplete, resulting in too much lithium carbonate remaining on the surface of the NCA. The surface is too alkaline and becomes more sensitive to humidity; at the same time, the melting point of lithium hydroxide is lower than that of lithium carbonate, which is more beneficial to the low-temperature sintering of NCA. However, because lithium hydroxide is highly volatile and has a strong irritating smell, it requires a well-ventilated production environment. The sintering atmosphere of NCA needs to be in a pure oxygen atmosphere to ensure that Ni2+ is oxidized into Ni3+. At the same time, due to the thermodynamic instability of Ni3+, the sintering temperature of NCA cannot be too low or too high. Currently, the optimal sintering temperature of NCA is 700~800℃.

　　Research status of NCA material modification technology

　　As the Ni% content in multi-component materials increases, the specific capacity of the material increases, but also brings more technical problems: cycle performance, especially high-temperature cycle performance issues, rate issues, safety issues, alkaline impurity content and the resulting The problem of strong water absorption (high moisture content). In response to these problems, in recent years, researchers have used a variety of anionic, cationic or multi-phase doping to stabilize the structure of high-nickel materials to improve cycle and storage performance. In addition, coating is also an effective method to prevent the electrolyte from corroding the cathode material and improve material circulation and storage stability. However, these methods cannot solve the problem of residual alkaline impurities in high-nickel materials, which is a key bottleneck for the industrialization and large-scale application of high-nickel materials.

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