Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of titanium-doped lithium iron phosphate

A technology of lithium iron phosphate and lithium carbonate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of entering lithium position, uncertainty, metal ions entering iron position, etc. The effect of compaction density, improving electronic conductivity

Inactive Publication Date: 2020-08-07
蒋央芳
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the preparation method of lithium iron phosphate, in addition to improving the ionic conductivity through carbon coating, is to achieve the improvement of electronic conductivity through metal ion doping, but the conventional doping method is generally realized by metal oxide or metal salt, so , the existence of doped metal ions may enter the iron site, and may also enter the lithium site, causing uncertainty

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of titanium-doped lithium iron phosphate
  • Preparation method of titanium-doped lithium iron phosphate
  • Preparation method of titanium-doped lithium iron phosphate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A preparation method of titanium-doped lithium iron phosphate, which comprises the following steps:

[0038] 1) Put titanium tetrachloride into the phosphoric acid solution of 1.5mol / L, stir while feeding titanium tetrachloride, the time of passing is 50min, maintain the temperature at 60°C during the passing process, then stir for 15min, then Put the reaction slurry into a sealed reaction kettle, evaporate under reduced pressure until the water is completely evaporated to dryness, the evaporated steam is recovered by condensation, and the tail gas is absorbed by spraying;

[0039] 2) After pouring out the evaporated powder, after jet crushing, sieving, and iron removal, lithium carbonate is mixed, and after mixing, slurrying, grinding, spraying and calcination, the obtained material is jet crushing, sieving After separation and iron removal, the primary calcined material is obtained;

[0040] 3) Add the primary calcined material to the polyethylene glycol solution, st...

Embodiment 2

[0054] A preparation method of titanium-doped lithium iron phosphate, which comprises the following steps:

[0055] 1) Put titanium tetrachloride into the phosphoric acid solution of 1.2mol / L, stir while introducing titanium tetrachloride, the time of passing is 50min, maintain the temperature at 65°C during the passing process, then stir for 15min, then Put the reaction slurry into a sealed reaction kettle, evaporate under reduced pressure until the water is completely evaporated to dryness, the evaporated steam is recovered by condensation, and the tail gas is absorbed by spraying;

[0056] 2) After pouring out the evaporated powder, after jet crushing, sieving, and iron removal, lithium carbonate is mixed, and after mixing, slurrying, grinding, spraying and calcination, the obtained material is jet crushing, sieving After separation and iron removal, the primary calcined material is obtained;

[0057] 3) Add the primary calcined material to the polyethylene glycol solution...

Embodiment 3

[0069] A preparation method of titanium-doped lithium iron phosphate, which comprises the following steps:

[0070] 1) Put titanium tetrachloride into the phosphoric acid solution of 2mol / L, stir while passing through titanium tetrachloride, the time of passing through is 50min, keep the temperature at 55°C during the passing process, then stir for 20min, then put The reaction slurry is put into a sealed reaction kettle, evaporated under reduced pressure until the water is completely evaporated to dryness, the evaporated steam is recovered by condensation, and the tail gas is absorbed by spraying;

[0071] 2) After pouring out the evaporated powder, after jet crushing, sieving, and iron removal, lithium carbonate is mixed, and after mixing, slurrying, grinding, spraying and calcination, the obtained material is jet crushing, sieving After separation and iron removal, the primary calcined material is obtained;

[0072] 3) Add the primary calcined material to the polyethylene g...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of titanium-doped lithium iron phosphate. The method includes introducing titanium tetrachloride into a phosphoric acid solution, then putting the reactionslurry into a sealed reaction kettle, and carrying out reduced pressure evaporation until water is completely evaporated to dryness; pouring out the evaporated powder, mixing lithium carbonate through jet milling, mixing, slurrying, levigating, spraying and calcining to obtain a primary calcined material; adding the primary calcined material into a polyethylene glycol solution, stirring and slurrying to obtain a slurried material, then adding a ferrous sulfate solution, a phosphoric acid solution and an ammonia water solution into the slurried material together, and filtering, washing and drying the reaction material to obtain an iron-titanium mixture; and mixing the iron-titanium mixture with lithium carbonate and a carbon source, slurrying, grinding, spraying and calcining to obtain a material, carrying out jet milling, screening and iron removal on the material to obtain the titanium-doped lithium iron phosphate. According to the invention, the uniformly titanium-doped lithium ironphosphate can be obtained, the discharge voltage platform is high, the compaction density is high, and the energy density is high.

Description

technical field [0001] The invention relates to a preparation method of titanium-doped lithium iron phosphate, belonging to the technical field of lithium batteries. Background technique [0002] Lithium iron phosphate is currently the mainstream battery cathode material. In the early stage, due to the guidance of subsidy policies, the market share gradually shrank. However, after the subsidy retreated, the cost advantage of lithium iron phosphate batteries gradually became prominent. At the same time, as one of the main application scenarios of lithium iron phosphate batteries, new energy buses may receive further policy support, which will benefit the lithium iron phosphate battery industry; for consumers in third- and fourth-tier cities and even towns, the price is low and the service life is long Lithium iron phosphate batteries are more competitive. In addition, on the whole, compared with foreign manufacturers, my country's lithium iron phosphate battery has obvious a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C01B25/45H01M4/58
CPCC01B25/45C01P2006/10C01P2006/11C01P2006/12C01P2006/40H01M4/5825Y02E60/10
Inventor 蒋央芳
Owner 蒋央芳
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com