Introduction
Aluminum hydroxide (chemical formula Al (OH)₃) is an important inorganic compound. It is widely used in medicine, ceramics, lithium battery precursors, etc. In this article, we will discuss the application of aluminum hydroxide as a precursor of lithium battery positive electrode material.
The application of aluminum hydroxide in the precursor of positive electrode materials for lithium batteries is an important direction for its high-end development. It mainly participates in the synthesis of positive electrode materials such as nickel cobalt manganese oxide (NCM) and nickel cobalt aluminum oxide (NCA) by providing aluminum sources.
Reference technical parameters
| Parameters | Specific requirements | Implementation methods |
| Particle size distribution | D50:1~5 μm，D90<10 μm | Adopt vibration mill + turbine classifier combined process, the particle size deviation is ≤±0.5 μm |
| Purity | Al₂O₃≥99.9%，Impurities（Fe₂O₃<50 ppm、Na₂O<100 ppm） | Acid washing and impurity removal + magnetic separation + air classification. Semiconductor-grade product needs to be washed with ultra-pure water (conductivity < 1 μS/cm) |
| Morphology | Spherical or quasi-spherical particles, specific surface area 8~15 m²/g | Add surfactants (such as PEG) to control the crystal morphology, and wet grinding with a sand mill to reduce particle angularity |
| Dispersibility | Slurry solid content ≥50%, no hard agglomerates | Add dispersant (such as PVP) after classification, and ultrasonic treatment to enhance dispersion |
Grinding and classification of aluminum hydroxide
As a key raw material for lithium battery cathode precursors, the grinding and classification precision of aluminum hydroxide directly affects battery energy density and cycle life.
— Grinding
| Grinding equipment | particle size range | application scenarios |
| Vibration mill | 0.1~50 μm | Preparation of fine powder D50: 5~10 μm |
| Jet Mill | 0.5~20 μm | Preparation of Ultra-fine Powder D50: 1~5 μm |
— Classification
Turbine classifier+cyclone seperator
Classsification effect: Spherical particles are closely arranged, tap density ≥ 2.0 g/cm³, particle size is uniform to reduce grain boundary defects, and interface resistance < 100 Ω・cm².
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Summary
In the future, with the refinement of preparation process, breakthroughs in new composite structure design and solid waste resource utilization technology, the application of aluminum hydroxide will extend from the existing high-nickel system to multi-element battery technology, promoting the development of lithium batteries towards higher energy density, longer life and greater safety.
