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A self-supporting composite electrode

A composite electrode and self-supporting technology, which is applied in the field of electrochemical energy storage, can solve the problems of decreased rate performance, hindering the diffusion of electrolyte ions, etc., to achieve high rate performance, improve rate performance, and increase the effect of mass ratio

Active Publication Date: 2021-03-02
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the carbon / active material composite nanosheet planes stacked parallel to the electrode surface seriously hinder the diffusion of ions in the electrolyte, and thus lead to a decrease in the rate performance, and provide a composite electrode that is vertical to the surface of the composite electrode. Self-supporting composite electrode with arrayed through holes in direction

Method used

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Embodiment 1

[0023] The self-supporting composite electrode of this embodiment constitutes a conductive support framework with graphene nanosheets, TiO 2 Deposited on the surface of graphene nanosheets, graphene / TiO 2 Composite nanosheets are the structural units in the electrode. They are stacked layer by layer in the direction perpendicular to the electrode surface. The composite nanosheets are mechanically compacted. The pressing pressure is 10Mpa, and the pressing time is 5min. The electrode is still penetrating in the direction perpendicular to the electrode surface. There is an array through-hole structure, the diameter of the through-holes is 10 μm, and the distance between the holes is 40 μm. The array via structure is created by laser drilling method. The scanning electron microscope image of the electrode is shown in image 3 As shown, a vertical via array is shown. Graphene / TiO 2 The transmission electron microscope image of the composite nanosheets is shown in Figure 4 sh...

Embodiment 2

[0027] The self-supporting composite electrode of the present embodiment constitutes the conductive support framework with graphene nanosheets, V 2 o 5 Deposited on the surface of graphene nanosheets, graphene / V 2 o 5 The composite nanosheet is the structural unit in the electrode, which is stacked layer by layer in the direction perpendicular to the electrode surface. The electrode also has an array of through-hole structures in the direction perpendicular to the electrode surface. The aperture of the through hole is 1 μm, and the distance between the holes is 100 μm. .

[0028] The thickness distribution of the graphene nano-sheets is in the range of 0.5-2.0 nm, and the plane radial size of the graphene nano-sheets is distributed in the range of 1.0-10.0 μm.

[0029] The graphene / V 2 o 5 The weight percentage of graphene in the nanosheet self-supporting composite electrode is 30%.

Embodiment 3

[0031] The self-supporting composite electrode of this embodiment uses carbon nanosheets to form a conductive support framework, and the Nb 2 o 5 Deposited on the surface of carbon nanosheets, carbon / Nb 2 o 5 The composite nanosheet is the structural unit in the electrode, which is stacked layer by layer in the direction perpendicular to the electrode surface. The electrode also has an array of through-hole structures in the direction perpendicular to the electrode surface. The aperture of the through hole is 5 μm, and the distance between the holes is 150 μm. .

[0032] The thickness of the carbon nanosheets is distributed in the range of 6.0-20.0 nm, and the plane radial size of the carbon nanosheets is distributed in the range of 7.0-40.0 μm.

[0033] The carbon / Nb 2 o 5 The weight percent content of carbon nanosheets in the nanosheet self-supporting composite electrode is 60%.

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Abstract

A self-supporting composite electrode belongs to the field of electrochemical energy storage. The composite electrode has an array through-hole structure in the direction perpendicular to the surface of the composite electrode, and the composite electrode is composed of a composite nanosheet composed of carbon nanosheets and electrochemical energy storage active materials, wherein the carbon nanosheets constitute the conductive support of the composite electrode The skeleton and the non-carbon electrochemical energy storage active material are deposited on the surface of the carbon nanosheets, and the composite nanosheets are stacked layer by layer in a direction perpendicular to the surface of the composite electrode. The invention has the advantages that: the array vertical through-hole structure provides a smooth diffusion channel for the ions in the electrolyte, and greatly shortens the diffusion distance of the ions in the electrolyte in the electrode. The composite dense electrode of carbon nanosheets with this array through-hole structure and active materials for electrochemical energy storage has high rate performance, high area specific capacity and high volume specific capacity.

Description

technical field [0001] The invention belongs to the field of electrochemical energy storage, in particular to a self-supporting composite electrode. Background technique [0002] With the rapid development of electronic products, higher requirements are placed on the performance of electrochemical energy storage devices. It is hoped that devices with smaller volumes can store higher energy, that is, have high volumetric energy density. High-density electrodes are an important part of realizing electrochemical energy storage with high volumetric energy density. [0003] At present, composite nanosheets of carbon nanosheets and various active materials for electrochemical energy storage (referred to as carbon / active material composite nanosheets) electrodes can achieve good rate performance and very high mass specific capacitance, but due to low packing density, Composite nanosheet electrodes contain less active material per unit volume, making it difficult to obtain energy s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/66H01M4/80B82Y40/00
CPCB82Y40/00H01M4/02H01M4/663H01M4/80H01M2004/021Y02E60/10
Inventor 方海涛许春阳丰炳梅
Owner HARBIN INST OF TECH
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