Lithium-rich manganese-based Electrode material and preparation method thereof

A lithium-rich manganese-based, positive electrode technology, applied in the direction of positive electrodes, battery electrodes, lithium batteries, etc., can solve the problems of voltage attenuation, poor rate and cycle performance, and low Coulombic efficiency

Active Publication Date: 2019-08-20
ENERGY RES INST OF SHANDONG ACAD OF SCI
View PDF7 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its inherent disadvantages limit its application, including: (1) low Coulombic efficiency due to irreversible phase t...

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
  • Lithium-rich manganese-based Electrode material and preparation method thereof
  • Lithium-rich manganese-based Electrode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation method of lithium-rich manganese-based positive electrode material,

[0028] (1) Dissolve niobium oxalate in deionized water to prepare a solution with a pH of 1;

[0029] (2) Mix the lithium-rich manganese-based material with the ammonia niobium oxalate solution, stir and heat to 60°C to form a suspension; the amount of ammonium niobate oxalate added is LMR (0.5Li 2 MnO 3 ·0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 ) 2wt% of material mass;

[0030] (3) Lithium nitrate, EDTA and dimethyl ether are added to the above suspension in a mass ratio of 1:1:0.1, and heated at 60°C for 10 hours to form a lithium-rich manganese-based material coated with a Li-Nb precursor;

[0031] (4) The lithium-rich manganese-based material coated with the Li-Nb precursor was calcined at 900° C. for 5 hours, and the calcined manganese-based positive electrode material was crushed to 200 mesh.

Embodiment 2

[0033] Preparation method of lithium-rich manganese-based positive electrode material,

[0034] (1) Dissolve ammonium niobium oxalate in deionized water to prepare a solution with a pH of 2;

[0035] (2) Mix the lithium-rich manganese-based material with ammonia niobium oxalate solution, stir and heat to 80°C to form a suspension; the amount of ammonium niobate oxalate added is LMR (0.5Li 2 MnO 3 ·0.5LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 ) 1wt% of material mass;

[0036] (3) Add the lithium source, complexing agent and dispersant to the above suspension in a mass ratio of 1:2:0.3, and heat at 95°C for 2h to form a lithium-rich manganese-based material coated with Li-Nb precursor ;

[0037] (4) The lithium-rich manganese-based material coated with the Li-Nb precursor obtained in step (3) is calcined at 600° C. for 12 hours, and the calcined lithium-rich manganese-based positive electrode material is crushed to 300 mesh.

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 of a lithium-rich manganese-based positive electrode material. The preparation method comprises the following steps of: (1) dissolving a niobium carboxylic acid derivative in deionized water to prepare a solution with the pH value of 1-3; (2) mixing a lithium-rich manganese-based material with the solution of the niobium carboxylic acid derivative formixing, and stirring and heating the mixture to a temperature of 55-80 DEG C, preferably 60-65 DEG C to form a suspension; (3) adding a lithium source, a complexing agent and a dispersing agent according to a molar ratio of 1:1-3:0.01-0.5 into the suspension, performing heating at a temperature of 60-100 DEG C for 10h to form a lithium-rich manganese-based material coated with a Li-Nb precursor; and (4) performing calcination of the lithium-rich manganese-based material coated with the Li-Nb precursor at a temperature of 500-900 DEG C for 5-15h to obtain a manganese-based positive electrode material. The method employs the mild acidity of the solution of the niobium carboxylic acid derivative to construct Li+/H+ structure defects at the surface of the lithium-rich manganese-based material,and performs addition of the lithium source and the high-temperature solid-phase reaction to construct an Nb-doped/LiNbO3-coated dual-shell surface reconstruction layer so as to obviously improve theelectrochemical performance of the lithium-rich manganese-based material.

Description

Technical field [0001] The invention relates to a method for performing surface modification treatment on a lithium-rich manganese-based positive electrode material and an electrode prepared by the method, and belongs to the technical field of lithium batteries. Background technique [0002] Lithium-rich manganese (xLi 2 MnO 3 ·(1-x)LiMO 2 ) Discharge specific capacity can reach 250mAh·g -1 , And low cost, it is expected to become the cathode material of the next generation electric vehicle power battery. Nevertheless, its inherent shortcomings limit its application. These shortcomings include: (1) the lower Coulomb efficiency caused by the irreversible phase transition during the first cycle; (2) the transition metal ion's low coulombic efficiency when charged to a higher voltage. Dissolution; (3) Voltage attenuation during long cycle cycles; (4) Poor rate and cycle performance. In response to the above problems, researchers have proposed some solutions, including bulk doping a...

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): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525H01M2004/021H01M2004/028H01M4/62H01M10/052Y02E60/10
Inventor 蔡飞鹏王波秦显忠蒋波姜桂林
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI
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