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

Preparation method of lithium iron phosphate precursor

A lithium ferrous phosphate and precursor technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as poor batch consistency and large-scale production, achieve good batch consistency, improve product purity and consistency good effect

Inactive Publication Date: 2012-08-08
SHAANXI HUAXING ELECTRONICS DEV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Technical problem solved by the present invention: provide a preparation method of lithium iron phosphate precursor, adopt wet chemical method to synthesize lithium iron phosphate material, overcome the defects of the two existing synthesis methods, solve the problem of poor batch consistency and Problems with mass production

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 lithium iron phosphate precursor
  • Preparation method of lithium iron phosphate precursor
  • Preparation method of lithium iron phosphate precursor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw material ratio: lithium dihydrogen phosphate LiH 2 PO 4 6.59kg, iron nitrate Fe (NO 3 ) 39 h 2 O25.61kg, glucose C 6 h 12 o 6 .H 2 O 2.09kg.

[0018] Preparation method: Dissolve lithium dihydrogen phosphate, ferric nitrate, and glucose in deionized water according to the above ratio, and stir for about 1 hour to completely dissolve. Then the fully dissolved solution is spray-dried and granulated, and the drying temperature is controlled at about 350°C, so as to obtain a spherical precursor powder with a controllable particle size. Then put the spherical precursor powder into a program-controlled heating furnace, protect it with high-purity nitrogen, and calcinate at 670±5°C for 10-12 hours at a heating rate of 4.5-5.5°C / min, and then at a cooling rate of 4-5°C / min. min is cooled to room temperature with the furnace and taken out to obtain capacity-type LiFePO4 products.

Embodiment 2

[0020] Raw material ratio: lithium dihydrogen phosphate LiH 2 PO 4 6.653kg, iron nitrate Fe(NO3)39H 2 O24.56kg, magnesium nitrate Mg (NO 3 ) 2 .2H 2 O 0.59kg, glucose C 6 h 12 o 6 .H 2 O 2.0kg.

[0021] Preparation method: Dissolve lithium dihydrogen phosphate, iron nitrate, magnesium nitrate, and glucose in deionized water according to the above ratio, and stir for about 1 hour to completely dissolve. Then the fully dissolved solution is spray-dried and granulated, and the drying temperature is controlled at about 300°C to obtain a spherical precursor powder with a controllable particle size. Then put the spherical precursor powder into a program-controlled heating furnace, protect it with high-purity nitrogen, and calcinate at 750±5°C for 8-10 hours at a heating rate of 7-8°C / min, and then at a cooling rate of 6-7°C / min. min Cool down to room temperature with the furnace and take it out, you can get the rate type LiFe 095 Mg 0.05 PO 4 product.

Embodiment 3

[0023] Raw material ratio: lithium dihydrogen phosphate LiH 2 PO 4 6.64kg, iron nitrate Fe (NO 3 ) 39 h 2 O24.77kg, magnesium nitrate Mg (NO 3 ) 2 .2H 2 O 0.47kg, glucose C 6 h 12 o 6 .H 2 O2.021kg.

[0024] Preparation method: same as Example 2.

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of a lithium iron phosphate precursor. The method comprises the following steps of: I, preparing the following raw materials in parts by weight: 6.5-6.8 parts of lithium dihydrogen phosphate, 24.5-25.6 parts of ferric nitrate, 0-0.6 part of magnesium nitrate and 2.0-2.2 parts of glucose; and II, fully dissolving the lithium dihydrogen phosphate, ferric nitrate, magnesium nitrate and glucose into deionized water according to a certain proportion, pelletizing the fully-dissolved solution with a spray drying process, controlling the drying temperature at 250-400 DEG C to obtain spherical powder with controllable particle diameter, calcining the spherical powder at the temperature of 650-800 DEG C for 8-12 hours, and cooling to the room temperature. A lithium iron phosphate material is synthesized by adopting a wet chemical method, so that the defects of two existing synthesis methods are overcome, and the problems of poor batch consistence and scale production are solved.

Description

Technical field: [0001] The invention belongs to the technical field of cathode materials for lithium ion batteries, and in particular relates to a preparation method of a lithium iron phosphate precursor. Background technique: [0002] The development of green and environment-friendly energy storage components--lithium-ion batteries is a very urgent problem in solving new energy and environmental protection technologies. At present, the widely researched lithium-ion battery cathode materials mainly include: LiCoO 2 , LiNiO 2 , LiMn 2 o 4 , LiCo x Ni 1-x o 2 Wait. Commercial LiCoO 2 The cost is high, the toxicity is high, and Co resources are limited, so it is not safe to use as a power battery. LiNiO 2 than LiCoO 2 The price is low, but the synthesis is difficult and the thermal stability is poor. Spinel LiMn 2 o 4 The system is one of the most potential positive electrode materials for power lithium-ion batteries. It has the advantages of abundant raw materia...

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): C01B25/45
Inventor 柏维李文兴
Owner SHAANXI HUAXING ELECTRONICS DEV
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