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

Preparation method for negative carbon material of lithium ion cell

A technology of lithium-ion batteries and carbon materials, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems that the cycle reversible performance is difficult to meet the requirements of practical applications, so as to improve electrochemical performance, reduce production costs, and solve specific capacity low effect

Inactive Publication Date: 2004-12-29
潮州正龙电池工业有限公司
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The lack of its cycle reversibility makes it difficult to meet the requirements of practical applications

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

[0026] Dissolve 5g of epoxy resin in 8g of acetone and cover the surface of 5g of natural graphite powder passing through a 400 mesh sieve, add 2% ethanol solution of ethylenediamine in a 2:1 weight ratio as a curing agent and cure at 120°C for 0.5 hours And raise the temperature to 450°C for carbonization, take out the cured product and crush it through a 300-mesh sieve, then put the crushed product in a crucible containing a certain concentration of oxygen atmosphere, raise the temperature to 700°C at a rate of 3°C / min, and keep it warm for 4 hours to obtain a lithium-ion battery Negative material.

[0027] Use the above materials as the negative electrode, with 1M LiClO 4 The EC plus DEC (1:1 weight ratio) solution was used as the electrolyte, a lithium sheet was used as the counter electrode, and a polypropylene film was used as the separator to make an experimental battery for charge and discharge cycle tests. The initial reversible capacity of the experimental battery i...

Embodiment 2

[0029] Dissolve in 15g dehydrated alcohol with 9g epoxy resin and cover in 1g the natural graphite powder surface that crosses 100 mesh sieves by above-mentioned method, add 10% with the ethanol solution of the ethylenediamine of 2: 1 weight ratio as solidifying agent at 100 Cure at ℃ for 1 hour and heat up to 400℃ for carbonization, take out the cured product and crush it through a 300-mesh sieve, then put the crushed product in a crucible containing a certain concentration of oxygen atmosphere and raise the temperature to 1000℃ at a rate of 1℃ / min, and keep it for 4 hours , to obtain the lithium ion battery negative electrode material.

[0030] Assemble the experimental battery according to the above method for charge and discharge cycle test. The initial reversible specific capacity of the battery is 320mAh / g, the specific capacity after 20 cycles is 314mAh / g, and the decay ratio is 2% of the initial reversible specific capacity.

Embodiment 3

[0032] Dissolve 2g of epoxy resin in 10g of dehydrated ethanol and coat the natural graphite powder surface of 6g through 500 mesh sieves according to the above method, add 2% ethanol solution of ethylenediamine with 4:1 weight ratio as curing agent at 120 Cure at ℃ for 1 hour and heat up to 450℃ for carbonization, take out the cured product and crush it through a 200-mesh sieve, then put the crushed product in a crucible containing a certain concentration of oxygen atmosphere and raise the temperature to 600℃ at a rate of 10℃ / min, and keep it for 10 hours , to obtain the lithium ion battery negative electrode carbon material.

[0033] An experimental battery was assembled according to the above-mentioned experimental method for charge-discharge cycle test. The initial reversible specific capacity of the battery is 282mAh / g, the specific capacity after 20 cycles is 272mAh / g, and the decay ratio is 3.6% of the initial reversible specific capacity.

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
particle sizeaaaaaaaaaa
Login to View More

Abstract

The present invention relates to a negative carbon material of lithium ion cell. It is made up by covering natural graphite powder surface with a layer of epoxy resin pyrolytic carbon, and its preparation method includes the following steps: dissolving liquid epoxy resin in anhydrous ethanol or acetone solvent, adding natural graphite powder to form paste-like mixture; adding ethanol solution of ethylenediamine, heating and solidifying, and pyrolytic treatment to obtain invented negative carbon material of lithium ion cell. Said invented product is high in quality, low in cost, possesses highspecific capacity and excellent circulating reversible property, and easy to implement industrial production.

Description

technical field [0001] The invention relates to a secondary battery, in particular to a polymer lithium ion battery, a lithium ion secondary battery negative electrode material and a preparation method thereof. Background technique [0002] During the overcharge process of lithium-ion batteries, the lithium recovered from the negative electrode will form a passivation layer on the surface of the negative electrode and produce dendrites. The dendrites can easily pierce the separator and cause an internal short circuit in the battery, which will not only cause the battery to fail, but also cause dangers such as combustion and explosion. Therefore, although the lithium battery with metal lithium as the negative electrode has a high operating voltage and specific capacity, safety issues limit its development. Using lithium carbon compounds instead of metal lithium in lithium batteries as the negative electrode material of lithium ion batteries solv...

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): H01M4/38
CPCY02E60/12Y02E60/10
Inventor 周震涛李海军
Owner 潮州正龙电池工业有限公司
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