Lithium ion battery electrode and preparation method thereof

A lithium ion battery and electrode technology, which is applied in the field of preparation of lithium ion battery electrodes to achieve the effects of improving specific capacity and rate performance, good dispersibility and small weight ratio

Inactive Publication Date: 2018-09-07
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the easy entanglement and agglomeration of carbon nanotubes, how to construct a well-dispersed carbon nanotube conductive network in electrodes is still an urgent problem to be solved.

Method used

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  • Lithium ion battery electrode and preparation method thereof
  • Lithium ion battery electrode and preparation method thereof
  • Lithium ion battery electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This embodiment provides a lithium ion battery electrode, which uses arrayed carbon nanotubes to prepare a lithium iron phosphate positive electrode, which is prepared by the following steps:

[0028] Prepare array carbon nanotubes according to the method of Chem Phys Lett 1999; 303(5):467-474;

[0029] Weigh 2 g of carbon nanotube samples, add 1000 g of nitrogen methyl pyrrolidone (NMP), and ultrasonically disperse to obtain a stable carbon nanotube dispersion;

[0030] Weigh lithium iron phosphate, conductive carbon black and PVDF according to the mass ratio of 89:4:7, put the three into a container and stir, add carbon nanotube dispersion liquid dropwise, the mass ratio of dispersion liquid to lithium iron phosphate is 5:1 , after continuous stirring for 6 hours, the positive electrode slurry was obtained;

[0031] The positive electrode slurry is coated on the aluminum foil, dried, rolled and cut to obtain the positive electrode sheet.

[0032] Such as figure 1 A...

Embodiment 2

[0034] This embodiment provides a lithium-ion battery electrode, using an aqueous dispersion of sulfur-doped carbon nanotubes to prepare a positive electrode of lithium cobaltate, which is prepared by the following steps:

[0035] Preparation of sulfur-doped carbon nanotubes, prepared according to Carbon 2015; 92:245-253 method;

[0036] Weigh 1 g of the carbon nanotube sample, add it to 1000 g of water, and ultrasonically disperse to obtain a carbon nanotube aqueous dispersion;

[0037] Weigh lithium cobaltate, conductive graphite, and LA132 binder according to the mass ratio of 90:5:5, put the three into a container and stir, and add the carbon nanotube aqueous dispersion liquid dropwise until the slurry has a moderate viscosity and is suitable for coating , after continuous stirring for 6 hours, the positive electrode slurry was obtained;

[0038] The positive electrode slurry is coated on the aluminum foil, dried, rolled and cut to obtain the lithium cobaltate positive el...

Embodiment 3

[0041] This embodiment provides a lithium-ion battery electrode, using an array carbon tube dispersion to prepare a graphite negative electrode, which is prepared by the following steps:

[0042] Prepare array carbon nanotubes according to the method of literature Chem Phys Lett 1999; 303(5):467-474;

[0043] Weigh 2 g of the carbon nanotube sample, add it into 1000 g of NMP, and disperse it ultrasonically to obtain a carbon nanotube dispersion;

[0044] Weigh graphite, conductive carbon black and PVDF according to the mass ratio of 85:5:10, put them into a container for stirring, and add the carbon nanotube dispersion liquid dropwise; after continuous stirring for 6 hours, the negative electrode slurry is obtained;

[0045] The negative electrode slurry is coated on the copper foil, dried, rolled and cut to obtain the negative electrode sheet.

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Abstract

The invention provides a lithium ion battery electrode and a preparation method thereof. The preparation method comprises the following steps: dispersing carbon nanotubes in a solvent to obtain a dispersion, wherein a mass ratio of the carbon nanotubes to the solvent is 0.0002 to 0.02:1; mixing an active material, an additive and a binder, adding the dispersion liquid dropwise during the mixing toobtain an electrode slurry; coating the current collector with the electrode slurry, drying and rolling to obtain the lithium ion battery electrode. The present invention also provides the lithium ion battery electrode prepared by the above method. The carbon nanotubes in the electrode obtained by the method have good dispersibility.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery electrode, in particular to a preparation method of a lithium-ion battery electrode with good dispersibility of carbon nanotubes, and belongs to the technical field of battery material preparation. Background technique [0002] The good conductive network in lithium-ion battery electrodes is conducive to the rapid conduction of electrons during charge and discharge, resulting in high specific capacity and rate performance. Carbon nanotubes have a high aspect ratio and good electrical conductivity, and are an ideal conductive additive for lithium-ion batteries. However, because carbon nanotubes are easy to entangle and agglomerate, how to construct a well-dispersed carbon nanotube conductive network in electrodes is still an urgent problem to be solved. Contents of the invention [0003] In order to solve the above technical problems, the object of the present invention is to prov...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/1397H01M4/131H01M4/133H01M4/136H01M4/36H01M4/525H01M4/58H01M4/587H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/131H01M4/133H01M4/136H01M4/1391H01M4/1393H01M4/1397H01M4/364H01M4/525H01M4/5825H01M4/587H01M4/625H01M10/0525Y02E60/10
Inventor 宁国庆
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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