Trivalent material surface coating machine mechanical force modification coating modification machine

Release time:

2024-12-05 09:41

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Ternary cathode materials are highly favored in the power battery market mainly due to their high capacity and good structural stability. Ternary materials represented by nickel-cobalt-manganese lithium, where nickel mainly serves to increase the material's capacity, cobalt helps reduce cation mixing and stabilizes the layered structure, and manganese can lower material costs while improving safety and stability.

However, high-nickel ternary cathode materials also have some issues. For example, high-nickel ternary materials face problems such as poor thermal stability, high residual alkalinity on the surface, and multiple phase transitions during the charge and discharge process, leading to deteriorated cycling performance. In addition, high-nickel ternary cathode materials are sensitive to humidity, have high total alkalinity, and require higher standards during industrial production, storage, transportation, and battery preparation. When the material comes into contact with air, the structure, morphology, and composition of the powder material change, resulting in a gradual decline in electrochemical performance.

To address these issues, modifying high-nickel ternary cathode materials has become a necessary demand. Currently, widely adopted modification measures in the industry include doping with heteroatoms, surface coating, and optimizing production processes. Doping with heteroatoms can suppress the cation mixing of Li/Ni, which helps reduce the first irreversible capacity, improve the stability of the crystal structure, and enhance the cycling performance and thermal stability of the material. Surface coating can mechanically separate the material from the electrolyte, reduce side reactions, inhibit the dissolution of metal ions, and optimize the cycling performance of the material. Optimizing production processes can improve the quality of NMC products, reduce the residual alkalinity on the surface, enhance the integrity of the crystal structure, and decrease the content of fine powders in the material.

Coating modification machines play a crucial role in the processing of ternary materials. By forming a nano-coating film, they can significantly reduce the contact area between the electrode material and the electrolyte. Under general conditions, a honeycomb mill can apply two or more coating media simultaneously, achieving a coating rate of up to. 99.2% and an activation rate of 99.8%. This nano-coating film can effectively reduce the side reactions between surface impurities of the material and the electrolyte, for example, reducing the erosion of the electrode material by HF and effectively lowering the occurrence of interfacial side reactions. At the same time, it can also improve the electronic conductivity of the surface of ternary cathode materials, enhancing the cycling stability of the material. Taking high-nickel ternary cathode materials as an example, issues such as high residual lithium on the surface, low packing density, and poor cycling performance have a significant impact on material performance. After surface coating with a coating modification machine, the structure of high-nickel materials can be stabilized, and their performance can be enhanced.。

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