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Preparation method of stretchable composite electrode

A composite electrode and pre-stretching technology, which is applied in the direction of battery electrodes, electrode carriers/current collectors, circuits, etc., to achieve the effect that it is not easy to break

Active Publication Date: 2021-01-05
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing carbon nanotube composite electrodes can only be stretched with a small strain in a single direction, and cannot withstand repeated stretching with a large strain in multiple directions.

Method used

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  • Preparation method of stretchable composite electrode
  • Preparation method of stretchable composite electrode
  • Preparation method of stretchable composite electrode

Examples

Experimental program
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Effect test

preparation example Construction

[0049] see figure 1 and 2 , an embodiment of the present invention provides a method for preparing a stretchable composite electrode, comprising the following steps:

[0050] Step S1, providing an elastic base, pre-stretching the elastic base along a first direction and a second direction, so that the elastic base is in a stretched state, and the first direction and the second direction intersect;

[0051] Step S2, laying a carbon nanotube active material composite layer on the surface of the elastic substrate, specifically includes the following steps:

[0052] S21, laying a first carbon nanotube film-like structure on the surface of the elastic substrate in a stretched state, the first carbon nanotube film-like structure includes a plurality of super-aligned carbon nanotube films, and the plurality of super-aligned carbon nanotube films The carbon nanotube films are stacked, and each super-aligned carbon nanotube film includes a plurality of carbon nanotubes, and the plura...

Embodiment 1

[0080] In this embodiment, a stretchable PDMS / super-parallel carbon nanotube film / Li(NiCoMn) is prepared 1 / 3 o 2 Composite positive electrode, its preparation method comprises: providing a rectangular PDMS substrate with a thickness of 7mm, carrying out 150% pre-stretching to the PDMS substrate along the length and width of the rectangular PDMS substrate respectively; The 6-layer super-parallel carbon nanotube cross film is covered on the PDMS substrate in the stretched state; 45mg Li(NiCoMn) 1 / 3 o 2 The active substance was dispersed in 60mL ethanol (10% power, 45min) using a cell pulverizer to form a dispersion, and 6mL of the dispersion was evenly added dropwise to the 6-layer super-parallel carbon nanotube cross-membrane using a pipette gun. Formation of Li(NiCoMn) after evaporation of ethanol to no obvious liquid droplets 1 / 3 o 2 Active material layer; in Li(NiCoMn) 1 / 3 o 2 The active material layer is covered with 2 layers of super-parallel carbon nanotube intersec...

Embodiment 2

[0082] In this embodiment, a stretchable PDMS / super-parallel carbon nanotube film / Li 4 Ti 5 o 12 Composite negative electrode, its preparation method is basically the same as embodiment 1, and its difference is only that active material layer is Li 4 Ti 5 o 12 .

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Abstract

The invention relates to a preparation method of a stretchable composite electrode, comprising: pre-stretching an elastic substrate along a first direction and a second direction; laying a carbon nanotube active material composite layer on the surface of the elastic substrate, including: A carbon nanotube membranous structure is laid on the surface of the elastic substrate, the first carbon nanotube membranous structure includes a plurality of stacked super-parallel carbon nanotube films; the first carbon nanotube membranous structure is away from the elastic substrate A first active material layer is added to the surface of the first active material layer; a second carbon nanotube membranous structure is laid on the surface of the first active material layer away from the elastic substrate, and the second carbon nanotube membranous structure includes a plurality of stacked super-parallel carbon nanotube film; and removing the pre-stretching of the elastic substrate, forming multiple wrinkles on the surface of the carbon nanotube active material composite layer.

Description

technical field [0001] The invention relates to a preparation method of a stretchable composite electrode, in particular to a preparation method of a stretchable composite electrode which can be stretched in different directions with large strain. Background technique [0002] Stretchable composite electrodes are an important part of stretchable electronic devices. In order to match the working characteristics and working environment of stretchable electronic devices, stretchable composite electrodes mainly need to meet two requirements: excellent electrochemical performance after stretching in different directions and resistance to repeated stretching in different directions. [0003] Carbon nanotube films have good mechanical and electrical properties, can be used as conductors, and can be combined with other active materials in different ways to obtain composite electrodes with good electrochemical properties. However, the existing carbon nanotube composite electrodes ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/1391H01M4/1393H01M4/36H01M4/485H01M4/525H01M4/78H01M10/0525B82Y30/00H01M4/04H01M4/13H01M4/139
CPCH01M4/1393H01M4/1391H01M4/78H01M4/366H01M4/485H01M4/525H01M10/0525B82Y30/00H01M2004/025H01M4/663H01M4/806H01M4/139H01M4/625Y02E60/10H01M4/133H01M2004/021H01M4/583
Inventor 于洋王佳平姜开利范守善
Owner TSINGHUA UNIV
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