Conglobation type nanostructured lithium iron phosphate anode material and method for producing the same

A technology of lithium iron phosphate and nanostructures, which is applied to structural parts, chemical instruments and methods, phosphorus compounds, etc., can solve the problems of low tap density, poor processing performance, and shedding of active substances, and achieve high tap density and processing good performance effect

Inactive Publication Date: 2009-05-13
GUANGZHOU FULLRIVER BATTERY NEW TECH +1
View PDF0 Cites 52 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the tap density of the material is very low. If the surface density is too high during the coating process, the active material is easy to fall off from the

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
  • Conglobation type nanostructured lithium iron phosphate anode material and method for producing the same
  • Conglobation type nanostructured lithium iron phosphate anode material and method for producing the same
  • Conglobation type nanostructured lithium iron phosphate anode material and method for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 1. Add 1.0mol FeSO 4 .7H 2 O and 1.0 mol of phosphoric acid were dissolved in distilled water, then the pH of the solution was adjusted to 7 with ammonia water, and stirred at high speed for 3 hours to obtain a light green suspension. Filtration, washing with water and drying to obtain the initial nano-precursor.

[0054] 2. Ball mill the initial nano-precursor obtained in the above steps with 15.8 g glucose, 1 mol LiOH, 0.2 mol phosphoric acid, and 1.5% CMC in an aqueous solution for 24 hours to react and obtain a colloidal suspension. Then spray the colloidal suspension into the drying tower with a centrifugal atomizing disc. The temperature in the drying tower is controlled at 350±5°C for drying. Agglomerated powder.

[0055] 3. Roast the agglomerated powder in step 2 at a high temperature of 700°C for 3 hours in a sealed tube furnace protected by nitrogen, then raise the temperature of the furnace to 1000°C and keep it warm for 15 minutes, then quickly pour the s...

Embodiment 2

[0058] 1. Mix 1mol FeSO 4 .7H 2 O and 1 mol of phosphoric acid were dissolved in distilled water, then the pH of the solution was adjusted to 7 with ammonia water, and stirred at high speed for 3 hours to obtain a light green suspension. Filtration, washing with water to obtain nano ferrous phosphate.

[0059] 2. Combine the nano-ferrous phosphate obtained in the above steps with 18g glucose, 0.9molLiOH, 0.2mol phosphoric acid and 0.025molZrO 2 High-speed spherical grinding and dispersing in the aqueous solution system for 5 hours to obtain a colloidal suspension, and then use a two-fluid nozzle to spray the colloidal suspension into the drying tower. The slurry is agglomerated by its own physical changes. Control the temperature at 250±5°C, and control the temperature at the air outlet at 120±5°C. After fully drying, collect the dried agglomerated powder with a cyclone separator.

[0060] 3. Roast the agglomerated powder in step 2 at a high temperature of 700°C for 3 hours...

Embodiment 3

[0063] 1. Mix 1.0molFe(NO 3 ) 3 .9H 2 O and 1.0 mol of phosphoric acid were dissolved in distilled water, then the pH of the solution was adjusted to 7 with ammonia water, and stirred at high speed for 3 hours to obtain a white suspension. Filtrating, washing with water and drying to obtain the nanometer precursor.

[0064] 2. Combine the nano-precursor obtained in the above steps with 25g glucose, 0.9molLiOH, 0.01molNb 2 o 5 High-speed spherical grinding and dispersion in the aqueous solution system for 5 hours to obtain a colloidal suspension, and then use a two-fluid nozzle to spray the colloidal suspension into the drying tower. The slurry is reunited by its own physical changes, and the temperature of the air inlet in the drying tower is controlled. At 250±5°C, the temperature at the air outlet is controlled at 120±5°C. After fully drying, collect the dried agglomerated powder with a cyclone separator.

[0065] 3. Roast the agglomerated powder in step 2 at a high tem...

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
Tap densityaaaaaaaaaa
The average particle sizeaaaaaaaaaa
Discharge specific capacityaaaaaaaaaa
Login to view more

Abstract

The invention relates to a reunion-shaped phosphoric lithium iron positive material with a nanometer structure and a preparation method thereof, and belongs to the field of batteries. The positive material comprises the following elements: a lithium source, an iron source, a phosphor source, a high-priced doped element and carbon. The molar ratio of the lithium source, the iron source, the phosphor source is 1:1 to 1.5:1 to 2; the molar fraction in the doping amount of the high-priced doped element is 0.1 to 5 percent of Li or Fe. The preparation method comprises the following steps: preparing an initial precursor: dissolving the iron source and the phosphor source in pure water; and filtering, washing and obtaining the initial precursor; preparing nanometer powder colloid suspending liquid: spraying and drying the nanometer powder colloid suspending liquid to be prepared into nanometer reunion-shaped powder; carrying out high-temperature heat treatment to the reunion-shaped powder; quenching, drying and sieving the reunion-shaped powder; and then obtaining the nanometer phosphoric acid lithium iron positive material with the nanometer structure. The material prepared not only has the electrochemical performance in nanometer diameter material, but also has the advantages of high tap density and excellent processing performance in micron diameter material.

Description

technical field [0001] The invention discloses an agglomerated nanostructured lithium iron phosphate positive electrode material and a preparation method thereof, which belong to the field of batteries, and in particular relate to the field of lithium ion battery cathode materials. Background technique [0002] Lithium iron phosphate (LiFePO 4 ) The positive electrode material has a long cycle life and high safety performance due to the stable structure of the charge and discharge products. The elements Fe and P contained in lithium iron phosphate are one of the elements with the largest reserves on the earth. They are rich in sources and cheap in price. They are currently all the anode materials for lithium-ion batteries that can be industrialized, such as lithium cobaltate, lithium manganate, and nickel. Lithium oxide and its binary and ternary materials are far behind. Therefore, since the Goodenough research group firstly proposed that lithium iron phosphate can be use...

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
CPCY02E60/12Y02E60/10
Inventor 张翠芬资利云姜华张玉梅杜彩侠
Owner GUANGZHOU FULLRIVER BATTERY NEW TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap