Preparation method for yttrium iron fluoride doped lithium manganese phosphate-carbon composite cathode material

A technology of lithium manganese phosphate and cathode material, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of low electrochemical capacity, poor high temperature performance, poor conductivity, etc., and achieve high specific capacity, long service life, and improved Effects of Conductivity and Cycling Stability

Inactive Publication Date: 2014-05-28
吉林新航能源有限公司
View PDF6 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the electrode potential of lithium manganese phosphate relative to Li is 4.1V, which is much higher than the 3.4V voltage platform of lithium iron phosphate, and under this vo

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

Embodiment 1

[0014] The chemical formula of the yttrium-iron-fluorine-doped lithium manganese phosphate is LiMn 0.79 Fe0. 2 Y 0.01 P 0.95 f 0.05 o 4 . Weigh lithium carbonate, manganese acetate, ferrous citrate, yttrium nitrate, phosphoric acid, and ammonium fluoride according to the molar weights of Li, Mn, Fe, Y, P, and F in the above chemical formula, use an appropriate amount of ethanol as the dispersion medium, and add A complexing agent citric acid with a molar ratio of 1:1 to lithium carbonate and fructose with a mass ratio of 0.1:1 to lithium oxalate were dispersed for 2 hours using an ultrasonic device to obtain a mixture, and the mixture was spray-dried to obtain a precursor powder. The precursor powder was purged in a reducing atmosphere for 10 minutes, then the temperature was raised to 600° C., kept at a constant temperature for 7 hours, and then cooled naturally to obtain yttrium-iron-fluorine-doped lithium manganese phosphate.

[0015] Mix conductive carbon black and c...

Embodiment 2

[0018] The chemical formula of yttrium iron fluorine doped lithium manganese phosphate is LiMn 0.675 Fe 0.3 Y 0.025 P 0.85 f 0.15 o 4 . Weigh lithium carbonate, manganese acetate, ferrous citrate, yttrium nitrate, phosphoric acid, and ammonium fluoride according to the molar weights of Li, Mn, Fe, Y, P, and F in the above chemical formula, use an appropriate amount of ethanol as the dispersion medium, and add A complexing agent citric acid with a molar ratio of 1:2 to lithium carbonate and fructose with a mass ratio of 0.15:1 to lithium oxalate were dispersed for 3 hours using an ultrasonic device to obtain a mixture, and the mixture was spray-dried to obtain a precursor powder, The precursor powder was purged in a reducing atmosphere for 20 minutes, then the temperature was raised to 700°C, kept at a constant temperature for 5 hours, and then cooled naturally to obtain yttrium-iron-fluorine-doped lithium manganese phosphate.

[0019] Mix conductive carbon black and carb...

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 relates to a preparation method for a yttrium iron fluoride doped lithium manganese phosphate--carbon composite cathode material. The chemical formula of the yttrium iron fluoride doped lithium manganese phosphate is LiMn1-x-y FexYyP1-zFzO4, wherein the x equals to 0.2-0.3; the y equals to 0.01-0.025; the z equals to 0.05-0.15.The preparation method comprises the following steps: (1) preparing the yttrium iron fluoride doped lithium manganese phosphate; (2) preparing conductive carbon dispersion; mixing ytterbium magnesium doped lithium manganese phosphate precursor with the conductive carbon dispersion to obtain a mixture; after ball milling and drying, placing the mixture in a mixed atmosphere of argon and acetylene; sintering and obtaining the yttrium iron fluoride doped lithium manganese phosphate-carbon composite cathode material; according to the invention, rare earth element Y and transitional element Fe are doped in the lithium manganese phosphate composite material, so as to replace part of M n; F is doped to replace part of P for modification and improvement to the electronic conductivity and physical activity; then, coating carbon black and a carbon nanotube mixed carbon network wrap the surface of the lithium manganese phosphate composite cathode material so as to further improve the electrical conductivity and cycling stability.

Description

Technical field [0001] The invention relates to a preparation method of yttrium-iron-fluorine-doped lithium manganese phosphate-carbon composite cathode material. Background technique [0002] At present, the anode materials of lithium-ion batteries mainly include lithium cobalt oxide, lithium manganese oxide, ternary materials and transition metal phosphates. Lithium cobalt oxide was first commercially used as a battery cathode material, but the material has high production costs, poor thermal stability, large environmental pollution, and poor safety performance. LiCoO 2 Cathode materials cannot meet many requirements of electric vehicles for power batteries. The lithium iron phosphate cathode material developed in recent years has become the most promising lithium ion power battery material due to its long cycle life, excellent safety performance, good high temperature performance and high rate discharge performance. Although the lithium iron phosphate cathode material h...

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): H01M4/62H01M4/58
CPCH01M4/5825H01M4/62H01M4/625Y02E60/10
Inventor 刘洋
Owner 吉林新航能源有限公司
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