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

Method of preparing lithium iron phosphate material and lithium iron phosphate power prepared by the method

A technology of lithium iron phosphate and a manufacturing method, which is applied to electrical components, battery electrodes, circuits, etc., can solve the problems of small particle size of iron source materials, unfavorable slurry mixing, and difficulty in controlling the particle size of calcined powder.

Inactive Publication Date: 2012-05-23
GREEN ENERGY ELECTRODE
View PDF6 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Accordingly, the content of this document not only restricts the use of iron source materials with too small particle size, but also makes it difficult to control the particle size of the calcined powder due to subsequent processing problems.
[0015] In Guangzhou Chemical Industry, Volume 39, No. 10, 2011, the paper "Preparation of LiFePO by solid-liquid combination-carbothermal reduction method 4 In "Research on / C Materials", it also adopts the method of drying and ball milling in the process, so the particles of lithium iron phosphate powder produced are also too small, which is not conducive to slurry mixing, and because no doping elements are added to improve the conductivity , so the characteristics of the product are relatively poor

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
  • Method of preparing lithium iron phosphate material and lithium iron phosphate power prepared by the method
  • Method of preparing lithium iron phosphate material and lithium iron phosphate power prepared by the method
  • Method of preparing lithium iron phosphate material and lithium iron phosphate power prepared by the method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] In this embodiment, ferric oxide is selected as the water-insoluble compound (iron source) and lithium dihydrogen phosphate as the water-soluble compound (phosphorus source and lithium source) in the phosphorus source, lithium source and iron source compounds, and Titanium dioxide is used as the iron site doping compound (titanium is used as the doping element replacing iron), and sucrose is used as the carbon source.

[0079] Wherein, lithium dihydrogen phosphate can be prepared as a ready-made product or in the following manner: first weigh 3.794 kg of lithium carbonate, add it to 20 kg of deionized water and stir. While stirring, 11.76 kg of 85% phosphoric acid was added to generate water-soluble lithium dihydrogen phosphate and carbon dioxide through the reaction of lithium carbonate and phosphoric acid.

[0080] In the aforementioned preparation method, because the powdered lithium carbonate is added to the aqueous solution first, and then phosphoric acid is added,...

Embodiment 2

[0089] The difference between embodiment 2 and embodiment 1 is that ferric phosphate is selected as the water-insoluble compound (phosphorus source and iron source), lithium hydroxide is used as the water-soluble compound (lithium source), niobium pentoxide is used as the lithium position doping compound, Ascorbic acid as a carbon source.

[0090] When preparing, first weigh 4.34kg of lithium hydroxide (LiOH.2H 2 O) Dissolve in 18 kg of deionized water, then add 0.28 kg of dispersant Disp 500 and 3.17 kg of ascorbic acid. After stirring, add 18.76kg of ferric phosphate and 0.336kg of niobium pentoxide. Then, as in Example 1, processes such as grinding and mixing, spray granulation, reducing atmosphere calcination, and airflow classification are carried out to produce carbon-coated lithium iron phosphate powder containing niobium, wherein the condition of reducing atmosphere calcination is sintering at 700 ° C for 16 Hour.

[0091] After measurement, the 0.2C discharge capac...

Embodiment 3

[0093] The difference between embodiment 3 and embodiment 1 is that lithium phosphate is selected as the water-insoluble lithium source and phosphorus source, and ferric nitrate (Fe(NO 3 ) 3 .9H 2 O) as a water-soluble iron source, chromium nitrate (Cr(NO 3 ) 3 .9H 2 O) as iron site doping compound (with trivalent chromium as the doping element replacing iron), glucose as carbon source.

[0094] When preparing, first weigh 38.574kg of Fe(NO 3 ) 3 .9H 2 O was dissolved in 16.5kg of deionized water, and then 3.35kg of glucose and 0.32kg of dispersant 1221 were added. After stirring, add 3.978kg of lithium phosphate and 2.01kg of Cr(NO 3 ) 3 .9H 2 O. Then, as in Example 1, the processes of grinding and mixing, spray granulation, reducing atmosphere calcination, and airflow classification are carried out to produce chromium-containing carbon-coated lithium iron phosphate powder. The condition of reducing atmosphere calcination is sintering at 720 ° C for 8 Hour.

[00...

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

The invention provides a method of preparing lithium iron phosphate material and lithium iron phosphate power prepared by the method. The method of preparing lithium iron phosphate material mainly comprises the steps of raw material selection, slurry preparation, slurry grinding, pelleting, calcining and the like, and also includes teh step of size selection based on needs. Compared with other conventional method, the method of the invention has teh advantages of simple process, low manufacturing cost and industrial large-scale production. In addition, the invention provides lithium iron phosphate power prepared by the above method, and the power can serve as anode material for lithium ion rechargeable batteries.

Description

technical field [0001] The present invention relates to a kind of manufacturing method of lithium-ion secondary battery anode material, particularly relate to a kind of lithium iron phosphate (LiFePO 4 ) manufacturing method of the material and lithium iron phosphate powder obtained by the method. Background technique [0002] Due to the advantages of high voltage, high energy density, stable discharge voltage, long cycle life, no memory effect and wide operating temperature range, lithium-ion secondary batteries have been widely used in various portable devices. In addition, in the application fields such as electric tools, electric bicycles and electric vehicles that require high capacity and high power, the development prospects of lithium-ion secondary batteries are also quite promising. [0003] Among the existing cathode materials for lithium-ion secondary batteries, lithium iron phosphate (or lithium iron phosphate) with an olivine lattice structure has high gravimet...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/58
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 林居南林荣正谢嘉容
Owner GREEN ENERGY ELECTRODE
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