With the continuous increase in requirements for energy density and rate performance in the new energy industry, the kích thước hạt distribution (PSD) of lithium sắt phosphate (LFP) has become a key factor determining slurry lớp phủ quality and electrochemical performance.
To address these demands, a leading domestic manufacturer focused on lithium battery cathode materials grinding to achieve shorter ion diffusion paths and higher material activity. The company required its LFP material to be ground to D50 1.30μm, while strictly controlling the increase of metallic impurities (such as zinc wear) and maintaining a narrow particle size distribution.
1. Core Equipment Selection for Lithium Battery Cathode Materials Grinding
Thiết bị: Bột Epic Dòng MQW Máy nghiền phản lực tầng sôi
Đặc điểm kỹ thuật:
- Multi-nozzle collaborative design:
The MQW series adopts oppositely arranged nozzles around the grinding chamber. Supersonic airflow drives particle–particle collision and self-grinding, greatly reducing wear on equipment walls. - High-precision classification:
Equipped with a horizontal high-speed classifier wheel. By adjusting the rotational speed (RPM), oversized particles can be precisely cut. - Lớp phủ gốm toàn diện:
For battery-grade materials, all product-contact parts (nozzles, classifier wheel, liners) are made of alumina or silicon carbide ceramic tiles, ensuring zero metal contamination.
2. Production Parameters and Measured Results
During on-site commissioning for the target of 1.30 μm, the following data were recorded:
| Mục | Process Parameter / Test Result |
|---|---|
| Feed particle size | D50 ≈ 15–20 μm |
| Áp lực nghiền | 0,7–0,8 MPa |
| Tốc độ bánh xe phân loại | 3,500–4,200 RPM (adjusted according to model) |
| Final product D50 | 1,30 μm |
| PSD characteristic | Narrow distribution curve, with D100 effectively controlled |
3. Core Advantages
- Morphology protection:
Compared with mechanical mills, the MQW máy nghiền phản lực generates very little heat during grinding, effectively preventing damage to the carbon coating layer on LFP particles. - High-efficiency dispersion:
Các máy nghiền phản lực process provides strong de-agglomeration, solving the agglomeration tendency of ultrafine LFP powders. - High level of automation:
The system integrates negative-pressure collection and automatic control, ensuring compliant dust emission and consistent batch-to-batch quality.
4. Conclusion
By adopting the Bột Epic MQW series jet mill, the customer successfully achieved a stable transition of lithium iron phosphate from fine to ultrafine particle size. Precise control at 1.30 μm not only improved the rate discharge performance of the vật liệu pin, but also provided strong technical support for the company’s competitiveness in the high-power battery market.