A three-dimensional porous self-supporting electrode and its preparation and application

A self-supporting electrode, three-dimensional porous technology, applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve the problems of long preparation time, small output, and incapable of large-scale industrial application, so as to improve energy density and improve electrical conductivity Sexuality, the effect of improving binding force

Active Publication Date: 2021-06-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, electrospinning is the preparation method with the most potential for commercialization and industrialization. However, due to the need to apply high voltages above kV during the preparation process, and the preparation time is long and the output is small, this method cannot be applied in large-scale industrialization.

Method used

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  • A three-dimensional porous self-supporting electrode and its preparation and application
  • A three-dimensional porous self-supporting electrode and its preparation and application
  • A three-dimensional porous self-supporting electrode and its preparation and application

Examples

Experimental program
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Effect test

Embodiment 1

[0038]Embodiment 1: (preparation Na 3 V 2 (PO 4 ) 3 @3DPC-1 self-supporting electrode)

[0039] Weighed 0.8g of polyacrylonitrile (organic polymer resin) and added it to 9.2g of DMF, and stirred for 4 hours until completely dissolved to form an 8% resin solution. Add 1.0 g of Na to the resin solution 3 V 2 (PO 4 ) 3 (electrode material), stirred for 12 hours, then ultrasonicated for 3 hours, and then stirred for 24 hours to obtain a uniformly dispersed mixed solution. Spread the mixed solution on a glass plate, volatilize for 5 minutes, set the thickness of the film to 100 μm, and then quickly immerse it in 5L of ethanol for 10 minutes to solidify to form a porous composite film. The composite film was pre-calcined at 300 °C for 3 h in an air atmosphere, and then calcined at 800 °C for 4 h in an argon atmosphere to obtain a 30 μm thick Na 3 V 2 (PO 4 ) 3 @3DPC-1 self-supporting electrode. The prepared Na 3 V 2 (PO 4 ) 3 @3DPC-1 Self-supporting electrode as wor...

Embodiment 2

[0040] Embodiment 2: (preparation Na 3 V 2 (PO 4 ) 3 @3DPC-2 self-supporting electrode)

[0041] Weighed 0.8g of polyacrylonitrile (organic polymer resin) and added it to 9.2g of DMF, and stirred for 6 hours until completely dissolved to form an 8% resin solution. Add 0.1 g of Na to the resin solution 3 V 2 (PO 4 ) 3 (electrode material), stirred for 12 hours, then ultrasonicated for 3 hours, and then stirred for 24 hours to obtain a uniformly dispersed mixed solution. Spread the mixed solution on a glass plate, volatilize for 5 minutes, set the thickness of the film to 100 μm, and then quickly immerse it in 5L of ethanol for 10 minutes to solidify to form a porous composite film. The composite film was pre-calcined at 300 °C for 3 h in an air atmosphere, and then calcined at 800 °C for 4 h in an argon atmosphere to obtain a 30 μm thick Na 3 V 2 (PO 4 ) 3 @3DPC-2 self-supporting electrodes. The battery assembly is the same as in Example 1.

Embodiment 3

[0042] Embodiment 3: (preparation Na 3 V 2 (PO 4 ) 3 @3DPC-3 self-supporting electrode)

[0043] Weighed 0.8 g of polyacrylonitrile (organic polymer resin) and added it to 9.2 g of DMF, and stirred for 7 hours until completely dissolved to form an 8% resin solution. Add 1.0 g of Na to the resin solution 3 V 2 (PO 4 ) 3 (electrode material), stirred for 12 hours, then ultrasonicated for 3 hours, and then stirred for 24 hours to obtain a uniformly dispersed mixed solution. Spread the mixed solution on a glass plate, volatilize for 30 minutes, set the thickness of the film to 100 μm, and then quickly immerse it in 5L of ethanol for 10 minutes to solidify to form a porous composite film. The composite film was pre-calcined at 300 °C for 3 h in an air atmosphere, and then calcined at 800 °C for 4 h in an argon atmosphere to obtain a 30 μm thick Na 3 V 2 (PO 4 ) 3 @3DPC-3 self-supporting electrodes. The battery assembly is the same as in Example 1.

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Abstract

The invention relates to a three-dimensional porous self-supporting electrode and its preparation and application. The prepared electrode does not need current collectors, binders and additional conductive carbon, which greatly improves the overall energy density of the electrode; the electrode has heteroatom doping The three-dimensional conductive carbon network and porous structure can ensure the rapid transmission of electrons and sodium ions, thus showing excellent rate performance; during the preparation process, the polymer resin is uniformly coated on the surface of the active material after carbonization, which can inhibit the active material from being released in the active material. The volume change during the cycle has excellent cycle performance; compared with traditional self-supporting electrode preparation methods (such as suction filtration, electrospinning, etc.), this process is simpler, lower energy consumption, and more suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of electrode materials, and discloses a self-supporting electrode prepared by a film-making process, a preparation method and application thereof. Background technique [0002] Energy is an important driving force for social development. The energy currently used is mainly divided into renewable energy (wind energy, water energy, solar energy, etc.) and non-renewable energy (coal, oil, natural gas, etc.). Due to the shortage of non-renewable energy resources and serious environmental pollution, the development of renewable energy has attracted more and more attention. However, renewable energy is discontinuous and unstable, and directly connected to the grid will have a great impact on the grid. Energy storage technology is a key technology to solve the discontinuous and unstable renewable energy. Among many energy storage technologies, lithium-ion batteries have the advantages of high energy density and long cycle l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/139H01M4/36H01M4/62H01M4/13H01M10/054
CPCH01M4/13H01M4/139H01M4/366H01M4/625H01M4/628H01M10/054H01M2004/021Y02E60/10
Inventor 郑琼易红明张华民李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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