Supercharge Your Innovation With Domain-Expert AI Agents!

Layered positive electrode material and preparation method and application thereof

A positive electrode material and layered technology, applied in the field of layered positive electrode materials and their preparation, can solve the problems of increased internal resistance, decreased material performance, and affected material safety performance, etc., and achieves improved conductivity, improved processing performance, and improved electrical Effects of chemical properties

Pending Publication Date: 2021-11-02
SVOLT ENERGY TECHNOLOGY CO LTD
View PDF7 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses water washing process to reduce the residual alkali on the surface of the material, but the performance of the material will be greatly reduced after washing, and the internal resistance will increase at the same time, which will affect the safety performance of the material.

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
  • Layered positive electrode material and preparation method and application thereof
  • Layered positive electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] This embodiment provides a layered positive electrode material, the chemical formula of the layered positive electrode material is Li 1.05 (Ni 0.88 co 0.09 mn 0.03 )O 2 .

[0043] The preparation method of the layered positive electrode material is as follows:

[0044] (1) layered nickel cobalt manganese hydroxide Ni 0.88 co 0.09 mn 0.03 (OH) 2 After mixing evenly with lithium hydroxide at a molar ratio of 1:1.05, sinter once at 900°C for 12 hours in an oxygen atmosphere of 5L / min, cool to room temperature, grind, pulverize and sieve to obtain a sintered product;

[0045] (2) Put the first-fired product described in step (1) into a sagger and put it in an experimental furnace, then feed sulfur dioxide gas with a flow rate of 10 L / min in the experimental furnace, and heat up to 400 °C at a heating rate of 4 ° C / min. °C and then perform secondary sintering for 6 hours to obtain the layered positive electrode material.

Embodiment 2

[0047] The difference between the embodiment and the embodiment 1 is that in the step (1) of the embodiment, the temperature of the primary sintering is 850°C.

[0048] All the other preparation methods and parameters are consistent with Example 1.

Embodiment 3

[0050] This embodiment provides a layered positive electrode material, the chemical formula of the layered positive electrode material is Li 1.02 (Ni 0.5 co 0.2 mn 0.3 )O 2 .

[0051] The preparation method of the layered positive electrode material is as follows:

[0052] (1) layered nickel cobalt manganese hydroxide Ni 0.5 co 0.2 mn 0.3 (OH) 2 After mixing evenly with lithium hydroxide at a molar ratio of 1:1.02, sinter once at 850°C for 18 hours in an oxygen atmosphere of 3L / min, cool to room temperature, grind, pulverize and sieve to obtain a sintered product;

[0053] (2) Put the first-fired product described in step (1) into a sagger and put it in an experimental furnace, then feed sulfur dioxide gas with a flow rate of 5 L / min in the experimental furnace, and heat up to 300 °C at a heating rate of 3 ° C / min. °C and then perform secondary sintering for 8 hours to obtain the layered positive electrode 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

PropertyMeasurementUnit
thicknessaaaaaaaaaa
Login to View More

Abstract

The invention provides a layered positive electrode material and a preparation method and an application thereof. The preparation method comprises the following steps: (1) mixing layered nickel-cobalt-manganese hydroxide with a lithium source, performing primary sintering in an oxygen atmosphere, and performing crushing and screening to obtain a primary sintering product; and (2) carrying out secondary sintering on the primary sintering product in a sulfur dioxide atmosphere to obtain the layered positive electrode material, wherein the chemical formula of the layered nickel-cobalt-manganese hydroxide is NiaCobMnc(OH)2, a is greater than or equal to 0.3 and less than or equal to 0.95, b is greater than or equal to 0.03 and less than or equal to 0.12, c is greater than or equal to 0.01 and less than or equal to 0.10, and a+b+c = 1. According to the preparation method provided by the invention, sulfur dioxide reacts with the residual alkali on the surface of the positive electrode material to generate lithium sulfate, so that the purpose of reducing the residual alkali on the surface of the layered positive electrode material and the pH value is achieved, the processing performance of the layered positive electrode material is improved, and the electrochemical performance of the battery is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a layered positive electrode material and a preparation method and application thereof. Background technique [0002] Lithium-ion batteries are widely used in electric vehicles, hybrid vehicles and energy storage systems due to their high capacity and high energy density. As one of the core components of lithium-ion batteries, cathode materials have a significant impact on the performance of lithium-ion batteries. [0003] Layered cathode materials have the advantages of high capacity and low price, and are being used in electric vehicles, but there are surface residual alkalis (LiOH and LiOH) in layered cathode materials 2 CO 3) The problem of high content and high pH value causes the gelation of the positive electrode material during the homogenization process, which hinders its industrial application. At present, the most commonly used method to reduce the residua...

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): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/50H01M4/505H01M4/525H01M10/0525C01P2006/40H01M2004/021H01M2004/028Y02E60/10H01M10/052H01M4/0471H01M4/366
Inventor 白艳张树涛王壮潘海龙王亚州
Owner SVOLT ENERGY TECHNOLOGY CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com