Supercharge Your Innovation With Domain-Expert AI Agents!

High-power nano ball shape lithium cobaltate material and producing method thereof

A technology of spherical lithium cobaltate and nano-lithium cobaltate, which is applied in the field of electrochemistry and lithium battery material science, can solve the problems of material cycle performance degradation, large surface energy of nanoparticles, and small degree of polarization, etc., and increase the capacity retention rate , Avoid particle agglomeration, improve the effect of tap density

Inactive Publication Date: 2008-01-23
BEIJING UNIV OF TECH
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this LiCoO 2 Unable to meet the requirements of high-power lithium-ion battery high-current charge and discharge and high energy density
Nanomaterials have a large specific surface area, and have the characteristics of quantum size effect, small size effect, surface effect and quantum tunneling effect, which make lithium ions embedded in nano active materials with a small depth and a short stroke, which can make the electrode work well under high current charging and discharging. Small degree of oxidation, high reversible capacity, and long cycle life, but the surface energy of nanoparticles is large, and it is easy to agglomerate during the charge and discharge process, causing a decline in the cycle 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
  • High-power nano ball shape lithium cobaltate material and producing method thereof
  • High-power nano ball shape lithium cobaltate material and producing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix carbon nanotubes and nano-lithium cobaltate evenly, the diameter of carbon nanotubes is 10-12 nanometers, the tube length is 2-10 microns, the particle size of nano-lithium cobaltate is 100-500 nanometers, and the mass ratio of the two is 1: 100; using deionized water to prepare a methylcellulose solution with a mass concentration of 2%. The carbon nanotubes and nano-lithium cobaltate were uniformly dispersed in the above methyl cellulose solution at a concentration of 0.05 g / mL. Uniformly disperse sorbitan monooleate in liquid paraffin with a mass concentration of 8%. Add the above-mentioned methylcellulose solution containing carbon nanotubes and nano-lithium cobaltate dropwise into the above-mentioned oil phase, emulsify for 0.5 hours, stir at a speed of 700r / min, control the temperature at 30°C, and react for 10 hours; after the reaction, Centrifugal washing with n-hexane and acetone respectively, drying at 80°C for 12 hours, and heat treatment at 250°C for 4 h...

Embodiment 2

[0018] Mix carbon nanotubes and lithium cobaltate nanometers evenly, the diameter of carbon nanotubes is 10-12 nanometers, the tube length is 2-10 microns, the particle size of lithium cobaltate nanometers is 100-500 nanometers, and the mass ratio of the two is 2: 100. A methylcellulose solution was prepared with deionized water at a concentration of 0.8%. The carbon nanotubes and nano-lithium cobaltate were uniformly dispersed in the above methyl cellulose solution at a concentration of 0.16 g / mL. Uniformly disperse sorbitan monooleate in n-heptane at a mass concentration of 5%. Add the above-mentioned methylcellulose solution containing carbon nanotubes and nano-lithium cobaltate dropwise into the above-mentioned oil phase, emulsify for 1 hour, stir at 600 r / min, control the temperature at 35°C, and react for 8 hours; after the reaction , successively washed by centrifugation with n-hexane and acetone, dried at 80°C for 12 hours, and then heat-treated at 220°C for 5 hours ...

Embodiment 3

[0020] Mix carbon nanotubes and lithium cobaltate nanometers evenly, the diameter of carbon nanotubes is 10-12 nanometers, the tube length is 2-10 microns, the particle size of lithium cobaltate nanometers is 100-500 nanometers, and the mass ratio of the two is 3: 100; using deionized water to prepare a methylcellulose solution with a mass concentration of 1.2%; uniformly dispersing carbon nanotubes and nano-lithium cobaltate into the above methylcellulose solution with a concentration of 0.27g / mL. Uniformly disperse sorbitan monooleate in cyclohexane with a mass concentration of 1%. Add the above-mentioned methylcellulose solution containing carbon nanotubes and nano-lithium cobaltate dropwise into the above-mentioned oil phase, emulsify for 2.5 hours, stir at a speed of 800r / min, control the temperature at 25°C, and react for 12 hours; after the reaction, Centrifugal washing with n-hexane and acetone respectively, drying at 80°C for 12 hours, and heat treatment at 200°C for ...

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
diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
densityaaaaaaaaaa
Login to View More

Abstract

The present invention belongs to lithium cell material and electrochemical technology field. Said material includes carbon nano tube and lithium cobaltate, in which the tube diameter of carbon nano tube is 10-12 nano, tube length is 2-10 micrometers, the mass ratio of both them is 1-5:100. Its preparation method includes the following steps: making carbon nano tube and nano lithium cobaltate be uniformly dispersed in methyl cellulose solution, its concentration is 0.05-0.5glmL; making surfactant be dispersed in organic solvent, its mass concentration is 1-15%; drop-adding the methyl cellulose solution containing carbon nano tube and nano lithium cobaltate into the organic solvent containing surfactant, emulsifying for 0.5-2.5hr, stirring and controlling temperature at 25-45 deg.C, reacting for 4-12hr, certrifugal washing, drying and making heat treatment for 2-6 hr at 200-300 deg.C.

Description

technical field [0001] The invention relates to a secondary granulation method for the positive electrode material of a micron-scale high-power spherical lithium cobaltate lithium ion battery, and belongs to the technical field of lithium battery materials and the field of electrochemical technology. Background technique [0002] In 1990, Sony Corporation of Japan developed lithium-ion batteries. Subsequently, lithium-ion batteries were widely used in portable electrical appliances such as mobile phones, cameras, and notebook computers. Lithium-ion batteries have high voltage, high specific energy, small size, light weight, no memory effect, no pollution, small self-discharge, and long cycle life. They are the best among new high-energy green batteries. [0003] Cathode material is a key component of lithium-ion batteries, accounting for about 40% of the total cost of the battery. Its performance directly affects the performance of lithium-ion batteries, so the research and...

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 Patents(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01D15/00C01B31/00C01G1/02C01G51/00H01M4/525
CPCY02E60/12Y02E60/10
Inventor 夏定国李燕赵煜娟
Owner BEIJING UNIV OF TECH
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