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Graphene-based flexible self-supporting binder-free electrode composite material and preparation method thereof

An alkenyl-based flexible, binder-free technology, applied in battery electrodes, circuits, structural parts, etc., can solve the problem of active materials detaching from current collectors, and achieve the effects of simple preparation, good conductivity, and good flexibility

Active Publication Date: 2021-11-09
SHANGHAI JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses a metal current collector to fix the electrode material to the current collector. It is easy to induce the active material to detach from the current collector when the electrode is bent.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 14ml of 6mg / ml graphene oxide aqueous solution, add 40mg of lithium-rich manganese-based active material, Li 1.2 mn 0.534 co 0.133 Ni 0.133 o 2 . Sonicate the mixture for 2 hours, then stir for 4 hours, drop the resulting solution into a 50mm×80mm×4mm aluminum mold, put the mold into a freeze dryer at -40°C for 2 hours, then take it out and continue to freeze dry for 24 hours to obtain graphene After the airgel is taken out, it is heat-treated at 500°C for 2 hours in a nitrogen atmosphere, and finally a graphene-based flexible electrode composite material with controllable shape can be obtained.

[0028] The prepared flexible electrode composite was bent 150 times at an angle of 30° and exhibited good mechanical properties.

Embodiment 2

[0030] Weigh 14 ml of a 6 mg / ml graphene oxide aqueous solution, and add 80 mg of sulfur powder. Sonicate the mixture for 2 hours, then stir for 4 hours, drop the resulting solution into a 50mm×80mm×4mm aluminum mold, put the mold into a freeze dryer at -40°C for 2 hours, then take it out and continue to freeze dry for 24 hours to obtain graphene After the airgel is taken out, it is heat-treated at 150°C for 24 hours in a nitrogen atmosphere, and finally a graphene-based flexible electrode composite material with controllable shape can be obtained.

[0031] The prepared flexible electrode composite was bent 150 times at an angle of 30° and exhibited good mechanical properties.

Embodiment 3

[0033] Weigh 14ml of 6mg / ml graphene oxide aqueous solution, add 50mg of lithium-rich manganese-based active material, Li 1.2 mn 0.534 co 0.133 Ni 0.133 o 2 . Sonicate the mixture for 2 hours, then stir for 4 hours, drop the resulting solution into a 50mm×80mm×4mm aluminum mold, put the mold into a freeze dryer at -40°C for 2 hours, then take it out and continue to freeze dry for 48 hours to obtain graphene After the airgel is taken out, it is heat-treated at 500°C for 10 hours in a nitrogen atmosphere, and finally a graphene-based flexible electrode composite material with controllable shape can be obtained.

[0034] The prepared flexible electrode composite was bent 150 times at an angle of 30° and exhibited good mechanical properties.

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PUM

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Abstract

The invention relates to a graphene-based flexible self-supporting binder-free electrode composite material and a preparation method thereof. The composite material is a porous three-dimensional structure composed of a mixture of electrode active materials and carbon oxide materials. Mix the electrode active material with the carbon oxide material solution, pour it into a mold, and place it at a low temperature for freezing; place it in a freeze dryer for drying to obtain the active material / carbon oxide material hydrogel, and perform heat treatment to obtain the final Graphene-based flexible self-supporting binder-free electrodes. Compared with the prior art, the battery structure prepared by the present invention can obtain good flexibility, and the electrode structure is not limited to the shape of a thin film, and has various shapes.

Description

technical field [0001] The invention belongs to the field of carbon nanomaterials, in particular to a graphene-based flexible self-supporting binder-free electrode composite material and a preparation method thereof. Background technique [0002] In today's social life, electronic devices are becoming more and more popular, and various portable electronic products have entered the daily life of the general public, and the demand for energy storage devices is also increasingly diverse. In many fields, deformation adaptability requirements are put forward for energy storage devices, which must have good flexibility, and must maintain the integrity of structure, function and life after deformation and multiple deformations. Portable devices are also highly sensitive to weight, and energy storage devices are also required to achieve light weight while maintaining functions. [0003] Traditional flexible electrodes are mainly film type. Patent No. CN105826083A [Shao Jiaojing, C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/052H01M10/0525
CPCH01M4/364H01M4/625H01M10/052H01M10/0525H01M2004/021Y02E60/10
Inventor 李华邸亚梁靖刘河洲陈玉洁邹磊
Owner SHANGHAI JIAOTONG UNIV
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