Preparation method of spherical hard carbon negative electrode material of high-capacity lithium ion battery

A technology for lithium ion batteries and negative electrode materials, which is applied in battery electrodes, carbon preparation/purification, secondary batteries, etc., can solve the problems of complex preparation methods, difficult large-scale industrial production, and high cost, and achieves simple preparation processes and products. Stable properties and low cost effects

Pending Publication Date: 2017-08-01
SHANGHAI SHANSHAN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention overcomes the defects of complex preparation method, high cost and difficulty in large-scale industrial production of the existing spherical hard carbon negative electrode materials, the preparation method is simple and easy, the source of raw materials is wide and the cost is low, and the prepared spherical hard carbon negative electrode The material has excellent electrochemical properties, high-current charge-discharge performance and cycle performance, high safety, stability and product consistency, and good adaptability to electrolytes and other additives

Method used

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  • Preparation method of spherical hard carbon negative electrode material of high-capacity lithium ion battery
  • Preparation method of spherical hard carbon negative electrode material of high-capacity lithium ion battery

Examples

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Effect test

Embodiment 1

[0034] (1), 1500g petroleum residue, 900g paraformaldehyde, 75g p-toluenesulfonic acid are fed into the reactor and stirred and mixed evenly to obtain the mixture;

[0035] (2) The mixture is heated to 180° C. for pre-crosslinking polymerization reaction for 4 hours under nitrogen atmosphere and stirring conditions, and after the reaction is completed, the temperature is cooled to room temperature and the material is discharged to obtain a pre-crosslinked polymer;

[0036] (3), the pre-crosslinked polymer is then pulverized and classified by an airflow pulverization classifier, which is pulverized and classified with compressed air at 9 MPa, a feed frequency of 21 Hz and a classification frequency of 90 Hz, to obtain a polymer with a volume average particle diameter D50 of 12.0 μm Powder;

[0037] (4), then disperse the polymer powder in simethicone oil, carry out balling treatment at 250°C under stirring, and then cool down to room temperature, and filter out the silicone oil...

Embodiment 2

[0042] (1) Crushing petroleum asphalt with a softening point of 90°C through a 100-mesh sieve to obtain petroleum asphalt powder, then taking 1500g of petroleum asphalt powder, 900g of paraformaldehyde, and 75g of p-toluenesulfonic acid into a high-speed mixing mixer mix, mix

[0043](2) The temperature of the mixed material is raised to 180°C under nitrogen atmosphere and stirring conditions for cross-linking polymerization reaction for 4 hours, and after the reaction is completed, the temperature is cooled to room temperature and the material is discharged to obtain a pre-cross-linked polymer;

[0044] (3), the pre-crosslinked polymer is then pulverized and classified by an airflow pulverization classifier, which is pulverized and classified with compressed air at 9 MPa, a feed frequency of 21 Hz and a classification frequency of 90 Hz, to obtain a polymer with a volume average particle diameter D50 of 11.6 μm Powder;

[0045] (4) Then, disperse the polymer powder in simeth...

Embodiment 3

[0050] (1), crush the coumarone resin with a softening point of 120°C through a 100-mesh sieve to obtain coumarone resin powder, take 1500g of coumarone resin powder, 900g of paraformaldehyde, and 75g of p-toluenesulfonic acid and put it into high-speed stirring Mix evenly in a mixer to obtain a mixture;

[0051] (2) Put the mixed material into the reaction kettle, raise the temperature to 180° C. for cross-linking polymerization reaction under nitrogen atmosphere and stirring conditions for 4 hours, cool down to room temperature after the reaction, and discharge the material to obtain a pre-cross-linked polymer;

[0052] (3), the pre-crosslinked polymer is then pulverized and classified by an airflow pulverization classifier, which is pulverized and classified with compressed air at 9 MPa, a feed frequency of 21 Hz and a classification frequency of 90 Hz, to obtain a polymer with a volume average particle diameter D50 of 12.1 μm Powder;

[0053] (4), then disperse the polyme...

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Abstract

The invention relates to the technical field of a lithium ion battery, in particular to a preparation method of a spherical hard carbon negative electrode material of a high-capacity lithium ion battery. The preparation method is characterized by comprising the following steps of (1) material mixing; (2) precrosslinked polymerization reaction; (3) crushing and grading; (4) polymer powder pelletizing treatment; (5) oxidation stability treatment; (6) pre-carbonization treatment; (7) carbonization treatment. Compared with the prior art, the preparation method has the advantages that the raw material sources are wide; the preparation process is simple; the structure and the processing performance of a precursor organic carbon source can be effectively improved through the precrosslinked polymerization reaction; the prepared spherical hard carbon has unique appearance and good pore diameter distribution, and also has the advantages of particle granularity distribution uniformity, high stacking density and the like; high capacity, high first coulombic efficiency, excellent high-rate performance and excellent circulation performance are also realized.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a method for preparing a spherical hard carbon negative electrode material for a high-capacity lithium-ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high single voltage, long cycle and service life, high specific energy and good power output performance. With the rapid development of wireless information communication products, digital entertainment products, electric vehicles, electric tools and other fields, higher requirements are put forward for the energy density, power density and lifespan of lithium-ion batteries. How to maintain good capacity characteristics and cycle stability under high-rate charge-discharge conditions is the premise of applying lithium-ion batteries to large-scale energy storage devices and high-power devices, and the development of negative electrode materials with high capacity and high power pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/05C01B32/15H01M4/587H01M10/0525B82Y40/00
CPCH01M4/587H01M10/0525B82Y40/00C01P2004/64C01P2004/61C01P2004/62C01P2006/40C01P2006/10C01P2006/11C01P2006/12C01P2006/17Y02E60/10
Inventor 葛传长沈龙曾繁俊吴志红丁晓阳
Owner SHANGHAI SHANSHAN TECH CO LTD
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