A preparation process for magnesium-doped modified nickel-iron-manganese-based precursor materials
By modifying nickel-iron-manganese-based materials with magnesium doping and employing an intermittent process and controlled reaction conditions, the problem of difficult control of morphology and particle size distribution in the co-precipitation method was solved, which improved the battery capacity and cycle performance of sodium-ion batteries and reduced wastewater treatment costs.
Patent Information
- Application Number
- CN202310910662.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-24
- Publication Date
- 2026-05-26
- Estimated Expiration
- 2043-07-24
AI Technical Summary
When preparing sodium-ion battery cathode material precursors by co-precipitation, the Ksp constants of Ni(OH)2, Fe(OH)2, and Mn(OH)2 are not on the same order of magnitude, making it difficult to control the morphology and particle size distribution of the precursors, which affects battery performance. Furthermore, ferrous ions are easily oxidized, increasing the viscosity of the slurry and resulting in poor battery capacity and cycle performance.
By using magnesium-doped modified nickel-iron-manganese-based materials, antioxidants and complexing agents were added to the reaction substrate to control the solid content, flow rate, and pH value of the reactants. A batch process was used to regulate the crystal structure and morphology, and a dispersant was added to reduce the slurry viscosity, thus preparing sodium-ion precursor materials with a single particle size.
This approach enables controllable precursor morphology and particle size distribution, improves battery capacity and voltage, enhances battery cycle performance, and reduces wastewater treatment volume and cost.