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3D printing positive electrode material, preparation method and application thereof

A 3D printing and cathode material technology, applied in the field of 3D printing cathode material preparation, can solve problems such as difficulty in improving the specific capacity and rate performance of electrode materials, difficulty in controlling the proportion of effective active substances in batteries, affecting ion diffusion rate, etc., to achieve high-efficiency electronic Transfer efficiency, good conductive network, the effect of improving the transmission rate

Active Publication Date: 2020-07-31
江西省纳米技术研究院
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As we all know, most of the current methods of preparing electrode material pole pieces still use the traditional coating method, and the electrode pole pieces prepared by the coating method also have some problems. (1) The coated pole piece is uneven, which affects ion diffusion rate; (2) it is difficult to control the proportion of effective active materials in the battery electrode material, so it is difficult to improve the specific capacity and rate performance of the electrode material; (3) carbon-coated aluminum foil is required as a current collector during the preparation of the battery positive electrode, The current collector resistance of carbon-coated aluminum foil is relatively large, which hinders a series of problems such as electron transmission.

Method used

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  • 3D printing positive electrode material, preparation method and application thereof
  • 3D printing positive electrode material, preparation method and application thereof
  • 3D printing positive electrode material, preparation method and application thereof

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preparation example Construction

[0031] As an aspect of the technical solution of the present invention, it relates to a method for preparing a 3D printing cathode material for lithium-sulfur batteries, which mainly includes: (1) lithium-sulfur battery cathode composite materials (active material, conductive agent, (2) 3D printing to prepare a positive electrode material film; (3) dry the electrode material and perform thermogravimetric analysis and SEM characterization; (4) dry the heat treatment of the electrode material; (5) reducing and drying the heat-melted material to form a film.

[0032] In some embodiments, the preparation method mainly includes the following steps:

[0033] Mix active material, conductive agent, binder and solvent uniformly to prepare electrode slurry;

[0034] Using 3D printing technology, placing the electrode slurry on the inner layer of the coaxial printing needle, placing the graphene oxide solution on the outer layer of the coaxial printing needle, and performing coaxial pri...

Embodiment 1

[0078] The specific steps of the 3D printing positive electrode material preparation method for lithium-sulfur batteries in this embodiment are:

[0079] (1) Weigh 18g of active substance sulfur, 300g of single-wall carbon nanotube conductive paste (including binder PTFE, solvent water) in a ball mill jar, wherein, single-wall carbon nanotube is 9g, PTFE is 3g, put 100g of agate zirconium strains with a diameter of 1mm are ground in a ball mill to evenly form electrode conductive paste;

[0080] (2) Put the above-mentioned prepared composite material into a 10mL syringe 1, and fix the syringe 1 on the intelligent syringe pump 1, put the prepared graphene oxide (GO) into the 10mL syringe 2, and put the syringe 2 fixed on the intelligent syringe pump 2;

[0081] (3) Connect the above two syringes to the coaxial printing needle at the same time, wherein the syringe 2 is connected to the outer layer of the printing needle, and the syringe 1 is connected to the inner layer of the ...

Embodiment 2

[0090] The specific steps of the 3D printing positive electrode material preparation method for lithium-sulfur batteries in this embodiment are:

[0091] (1) Weigh 14g of the composite material of active substance sulfur and single-walled carbon nanotubes, 7g of Ketjen black, 2.4g of polyvinylidene fluoride, and 50mL of solvent N-methylpyrrolidone in a grinding jar, put 30g, diameter Agate zirconium strains of 2mm are ground in a ball mill to evenly form electrode conductive paste;

[0092] (2) Put the above-mentioned prepared composite material into a 10mL syringe 1, and fix the syringe 1 on the intelligent syringe pump 1, put the prepared graphene oxide (GO) into the 10mL syringe 2, and put the syringe 2 fixed on the intelligent syringe pump 2;

[0093] (3) Connect the above two syringes to the coaxial printing needle at the same time, wherein the syringe 2 is connected to the outer layer of the printing needle, and the syringe 1 is connected to the inner layer of the print...

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Abstract

The invention discloses a 3D printing positive electrode material, a preparation method and application thereof. The preparation method comprises the following steps: uniformly mixing an active substance, a conductive agent, a binder and a solvent to prepare electrode slurry; by using a 3D printing technology, placing the electrode slurry on the inner layer of a coaxial printing needle head, placing a graphene oxide solution on the outer layer of the coaxial printing needle head, and carrying out coaxial printing to obtain a composite positive electrode material; and carrying out drying and heat treatment on the composite positive electrode material to obtain the 3D printing positive electrode material. The invention provides a preparation method of a novel positive electrode material. According to the invention, by using a 3D printing method, the traditional concept of preparing a positive electrode material containing a current collector by utilizing a coating method is broken through, the obtained electrode material does not need an aluminum foil as the current collector, the positive electrode material with high sulfur loading capacity, no current collector, high-efficiency ions and high electron transmission efficiency and integrated structure is realized, and the positive electrode material has potential application in the field of lithium-sulfur battery application.

Description

technical field [0001] The invention relates to a preparation method of a 3D printing positive electrode material, in particular to a 3D printing positive electrode material for a lithium-sulfur battery and a preparation method thereof, as well as its application in the field of lithium-sulfur batteries, belonging to the technical field of energy storage materials. Background technique [0002] 3D printing technology is also called "additive manufacturing technology". Compared with traditional manufacturing technology, it has obvious advantages such as low cost, fast and simple process, and no pollution to the environment. Among many 3D printing molding technologies, extrusion 3D printing technology is the most widely used because of its simple and fast operation, low cost and diversity of material systems. And the positive electrode of lithium-sulfur battery was prepared by extrusion 3D printing technology. This method can also be applied to almost all electrode active mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/38H01M4/62H01M4/13H01M10/0525B29C64/106B29C64/379B33Y10/00B33Y40/20B33Y70/10B33Y80/00
CPCH01M4/38H01M4/625H01M4/139H01M4/13H01M10/0525B29C64/106B29C64/379B33Y10/00B33Y40/00B33Y70/00B33Y80/00H01M2004/028Y02E60/10
Inventor 张永毅方爱金曹玉芳牛宇涛
Owner 江西省纳米技术研究院
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