Preparation method of lithium iron phosphate cathode material with high rate, high capacity and low temperature performance by reverse salting out method
A low temperature performance, lithium iron phosphate technology, applied in chemical instruments and methods, battery electrodes, phosphorus compounds, etc., can solve the problems of poor low temperature performance, poor rate performance, poor conductivity of lithium iron phosphate, etc., and achieve a small specific surface area. Effect
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0025] (1) Ferric phosphate and glucose are mixed at a mass ratio of 12:1, and the solid content is controlled at 45%. After mechanical mixing and stirring, microwave drying is performed to control the water content at 20%. Then, the material was sintered at 325° C. under nitrogen and maintained at a pressure of 0.8 MPa for 3 hours.
[0026] (2) Cyclic salting-out crystallization: the product in (1), lithium acetate, glucose in a mass ratio of 13:10.5:0.5, with deionized water as a solvent, with a solid content of 72%, first mechanically stirred at 65°C until When the solid content is below 50%, stand still until the slurry is dry and crystallized; then continue to add deionized water until the solid content is 72%, and repeat salting out until the surface distribution is relatively uniform.
[0027] (3) Tablet shaping: the product in step (2) is mixed with glucose at a mass ratio of 14:0.5, the solid content is controlled at 30%, mechanically stirred, and microwave-dried. Th...
Embodiment 2
[0030] (1) Iron phosphate and sucrose are mixed according to a mass ratio of 12:1, and the solid content is controlled at 45%. After mechanical mixing and stirring, microwave drying is performed to control the water content at 25%. The material was then placed under nitrogen conditions at 325°C,
[0031] And keep the pressure of 0.7MPa for sintering for 3h.
[0032] (2) Cyclic salting out crystallization: mix the product in (1), lithium hydroxide, and sucrose at a mass ratio of 13:5:0.5, use deionized water as a solvent, and have a solid content of 80%, and mechanically stir at 50°C Until the solid content is below 45%, stand still until the slurry is dry and crystallized; then continue to add deionized water until the solid content is 80%, and repeatedly carry out salting out until the surface distribution is relatively uniform.
[0033] (3) Tablet shaping: the product in step (2) is mixed with soluble carbohydrates at a mass ratio of 7:0.5, the solid content is controlled a...
Embodiment 3
[0036] (1) Ferric phosphate and citric acid are mixed at a mass ratio of 12:1, and the solid content is controlled at 45%. After mechanical mixing and stirring, microwave drying is performed to control the water content at 25%. Then the material was sintered at 325° C. under nitrogen and maintained at a pressure of 0.7 MPa for 3 hours.
[0037] (2) Cyclic salting out crystallization: the product in (1), lithium carbonate, and sucrose in a mass ratio of 13:5:10:0.5, using deionized water as a solvent, with a solid content of 65%, first mechanically at 50°C Stir until the solid content is below 30%, stand still until the slurry is dry and crystallized; then continue to add deionized water until the solid content is 65%, and repeat salting out until the surface distribution is relatively uniform.
[0038] (3) Tablet shaping: the product in step (2) is mixed with citric acid in a mass ratio of 7:0.5, the solid content is controlled at 30%, mechanically stirred, and microwave-dried...
PUM
| Property | Measurement | Unit |
|---|---|---|
| specific surface area | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More