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

A method for making Fe lithium phosphate compound anode material

A composite cathode material, lithium iron phosphate technology, applied in the direction of electrode manufacturing, phosphorus compounds, lithium compounds, etc., can solve the problem of poor consistency and stability of lithium iron phosphate, irregular product shape, affecting the industrialization of lithium iron phosphate materials, etc. question

Inactive Publication Date: 2008-09-10
张守文
View PDF3 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of ball milling and drying, the following two defects will inevitably occur: 1. Due to the destruction of the shape and particle size distribution of the precursor in the ball milling process, the product has irregular shape and wide particle size distribution, thus It has a great impact on the processing performance of the product in the process of making batteries
2. The segregation and loss of carbon in the drying process lead to uneven distribution of carbon in the product and the content is difficult to control, resulting in poor consistency and stability of lithium iron phosphate, which is a big problem affecting the industrialization of lithium iron phosphate materials big bottleneck

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

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0014] The preparation method of a kind of lithium iron phosphate composite cathode material of the present invention comprises the following steps:

[0015] A), lithium, iron, phosphorus materials and doped metal ions are dosed in a molar ratio of 1:0.9~1.1:0.95~1.1:0.02~0.1, then put into a high-speed mixer and mix for 3~5 hours, mix No grinding media and abrasives are added during the process, and the temperature of the material in the mixer is controlled within 40°C by circulating cooling water; then the mixed material is put into an atmosphere furnace protected by argon or nitrogen, and the temperature is 450°C~ Sintering at a temperature of 650°C for 5 to 15 hours to obtain a doped lithium iron phosphate material;

[0016] B), mix the doped lithium iron phosphate material obtained in step A) and the conductive agent material according to the ratio of 20:1 to 20:3 in parts by weight, and then put it into a high-speed mixer and mix for 1 to 2 hours, No grinding media and ...

example 2

[0023] Example two: 8300g lithium carbonate (Li 2 CO 3 ) and 40000g ferrous oxalate (FeC 2 o 4 2H 2 O) and 26000 ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) and 500g magnesium hydroxide (Mg(OH) 2 ) into the high-speed mixer, control the temperature of the material within 40°C by cooling circulating water, and mix for 4 hours; then put the mixed material into a mesh belt furnace protected by a nitrogen atmosphere, and keep it warm at 500°C for 8 hours Then the sintered material is added with starch in the ratio of 1:0.2 by the mass ratio of lithium iron phosphate and starch, added to the high-speed mixer and continued to mix for 1 hour, and then the mixed material was continued to be put into the nitrogen atmosphere protection In the mesh belt furnace, heat preservation at 800°C for 15 hours to obtain the lithium iron phosphate composite material; finally, the lithium iron phosphate composite material is crushed and classified by an ultra-fine jet mill to obtain the f...

example 3

[0025] Example three: 23100g lithium dihydrogen phosphate (LiH 2 PO 4 ) and 40000g ferrous oxalate (FeC 2 o 4 2H 2 O) and and 500g magnesium hydroxide (Mg(OH) 2 ) into the high-speed mixer, control the temperature of the material within 40°C by cooling circulating water, and mix for 3 hours; then put the mixed material into a mesh belt furnace protected by a nitrogen atmosphere, and keep it warm at 600°C for 8 hours Then the sintered material is added with starch in the ratio of 1:0.2 by the mass ratio of lithium iron phosphate and starch, added to the high-speed mixer and continued to mix for 1 hour, and then the mixed material was continued to be put into the nitrogen atmosphere protection In the mesh belt furnace, heat preservation at 800°C for 15 hours to obtain the lithium iron phosphate composite material; finally, the lithium iron phosphate composite material is crushed and classified by an ultra-fine jet mill to obtain the final lithium iron phosphate product. Aft...

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
densityaaaaaaaaaa
specific surface areaaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

The invention relates to a new technique for preparing a composite positive material of lithium iron phosphate. The preparation technique is that: first, precursors containing lithium, iron, phosphorus and doped elements are evenly mixed by a high-speed mixer, and then a doped lithium iron phosphate matrix is obtained by low temperature sintering in an inert atmosphere protection kiln; next, the doped lithium iron phosphate matrix and a conductive agent material are evenly mixed by the high-speed mixer, and then the composite positive material of lithium iron phosphate, which is wrapped by carbon, is obtained by high-temperature sintering in the insert atmosphere protection kiln; finally, the lithium iron phosphate material is obtained by grinding and grading process. Particle size D50 of the material is 3-10Mum, tap density and specific surface area thereof are 1.0-2.0g / cm<3> and 10-20m<2> / g. The new technique for preparing the composite positive material of lithium iron phosphate is simple and easy to be controlled and the prepared lithium iron phosphate material has good processing performance, high capacity and good amplification performance and is easy to realize industrial production.

Description

technical field [0001] The invention relates to a preparation method of lithium iron phosphate composite cathode material. Background technique [0002] Lithium-ion batteries, as a secondary green power source with excellent performance, have been more and more widely used in various mobile tools. Especially in recent years, due to the increasingly strict control of environmental protection in the country, the production of lead-acid batteries, which are mainly used in electric vehicles, has been more strictly controlled, while electric vehicles driven by high-energy secondary lithium-ion batteries ( Electric Vehicle (EV) and hybrid electric vehicles (Hybrid Electric Vehicle, HEV) powered by fuel and lithium-ion batteries are getting more and more attention from the country and large enterprises. LiFePO 4 The lithium-ion secondary power battery as the positive electrode has become the hottest lithium-ion power battery positive electrode material in the world because of its...

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): H01M4/04H01M4/58H01M4/48H01M4/62C01B25/45C01D15/00
CPCY02E60/10
Inventor 张守文
Owner 张守文
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