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

Modified lithium ferrite positive electrode material, preparation method thereof and positive plate

A cathode material, lithium ferrite technology, applied in the direction of positive electrode, active material electrode, battery electrode, etc., can solve the problem of low battery capacity, and achieve the improvement of specific capacity, complete and orderly crystal structure, and reduction of electrode polarization effect. Effect

Inactive Publication Date: 2021-01-05
安徽德亚电池有限公司
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, Li doped with manganese metal elements under the existing iron-manganese ratio 5 FeO 4 Although the lithium battery made of the positive electrode material has good cycle performance, the battery capacity is low, which restricts Li 5 FeO 4 Application as cathode material in lithium-ion batteries

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
  • Modified lithium ferrite positive electrode material, preparation method thereof and positive plate
  • Modified lithium ferrite positive electrode material, preparation method thereof and positive plate

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0024] One aspect of the present invention provides a method for preparing a modified lithium ferrite positive electrode material, comprising the following steps:

[0025] Step 1: Take LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O and Mn(CH 3 COOH) 2 4H 2 O raw materials were mixed, and dried at 100°C for 8 hours to obtain mixture A (the mixture of anhydrous lithium hydroxide, iron nitrate and manganese acetate is called mixture A); among them, LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O and Mn(CH 3 COOH) 2 4H 2 The molar ratio of Li:Fe:Mn in the O raw material is 5:0.95:0.05-5:0.85:0.15. That is, the molar ratio of Li / (Fe+Mn) is 5:1.

[0026] LiOH·H 2 O as lithium source, Fe(NO 3 ) 3 9H 2 O is used as the iron source, and carbon powder is used to protect it during the roasting process without gas protection, and the antifluorite-type Li 5 FeO 4 . After Li 5 FeO 4 The microscopic morphology of the samples was observed, and the Li 5 FeO 4 The X-ray diffraction pattern, compared wit...

Embodiment 1

[0039] LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, Mn(CH 3 COOH) 2 4H 2 O raw materials were mixed at a molar ratio of 5:0.85:0.15, and dried at 100°C for 8 hours to obtain a precursor;

[0040] The above-mentioned Li 5 Fe 0.85 mn 0.15 o 4 sample;

Embodiment 2

[0042] LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, Mn(CH 3 COOH) 2 4H 2 O raw materials were mixed at a molar ratio of 5:0.90:0.10, and dried at 100°C for 8 hours to obtain a precursor;

[0043] The above-mentioned Li 5 Fe 0.90 mn 0.10 o 4 sample;

[0044] in Li 5 Fe 0.90 mn 0.10 o 4 Add 9% CNT to the sample for mixing and grinding to obtain Li 5 Fe 0.90 mn 0.10 o 4 / CNT composite cathode material.

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 modified lithium ferrite positive electrode material. The method comprises the following steps: step 1, mixing LiOH.H2O, Fe (NO3)3.9 H2O and Mn(CH3COOH) 2.4H2O as raw materials, and drying the mixture in an environment of 100 DEG C for 8 hours to obtain a mixture A, wherein the molar ratio of Li to Fe to Mn in the raw materials of LiOH.H2O, Fe (NO3)3.9H2O and Mn(CH3COOH)2.4H2O is 5: 0.95: 0.05-5: 0.85: 0.15; 2, grinding the mixture A, and roasting the ground mixture A in an environment with the temperature of 450-490 DEG C for 8-12 hours to obtain a mixture B containing Li5FeO4; and 3, oxidizing and roasting the mixture B in an environment of 700-800 DEG C for 24 hours, standing at room temperature, cooling, grinding and sieving to obtain the Li5Fe1-xMnxO4 positive electrode material, wherein x is any one of 0.05, 0.10 and 0.15. According to the invention, the Li5FeO4 is doped with manganese metal according to a new lithium-iron-manganese ratio, so that the crystal form of the Li5FeO4 is more complete and orderly, and the resistance of charge transfer of the positive electrode material is reduced; and meanwhile, the electrode polarization effect of the lithium battery prepared from the positive electrode material under high current is reduced, so that the specific capacity of a battery is improved.

Description

【Technical field】 [0001] The invention relates to the technical field of lithium batteries, in particular to a modified lithium ferrite cathode material, a preparation method thereof, and a cathode sheet comprising the modified lithium ferrite cathode material. 【Background technique】 [0002] At present, the anode material of lithium-ion batteries is mainly LiMnO 2 , LiMn 2 o 4 , LiNiO 2 and LiFePO 4 . However, each of the above-mentioned positive electrode materials has its own disadvantages, either there is a problem of high cost due to poor metal sources, or there is a problem of serious capacity fading or high resistivity. Therefore, at this stage Li 5 FeO 4 As a new type of positive electrode material, it only includes Li, Fe, and O in terms of element composition, with few element compositions, wide material sources, simple preparation, and low cost. Its crystal structure has two types: fluorite type and inverse fluorite type, among which inverse fluorite type ...

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): H01M4/36H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/362H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李穷胡天文李涛邵振东
Owner 安徽德亚电池有限公司
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