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Flexible device and preparation method thereof

A technology of flexible devices and negative active materials, which is applied in the direction of electrical components, structural parts, climate sustainability, etc., can solve the problems of decreased bonding strength, great difficulty, and easy fatigue, etc., to increase the bonding strength and prepare The process is simple and the effect of increasing the contact area

Active Publication Date: 2015-10-21
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the flexible battery pack of this design is bent, due to the strong rigidity of the top layer and the bottom layer, the bending degree and fatigue strength of the flexible battery pack are greatly limited due to the influence of stress, which affects the performance of the flexible battery pack. After a certain bending angle and bending times, the bonding strength of the adhesive will decrease, resulting in poor reliability, and fatigue will easily occur in the non-bonding area close to the adhesive due to the inconsistent force, which is harmful to flexibility. The safety performance of the battery pack is at risk
Moreover, this method needs to control the bonding strength of the adhesive and the uniformity of the amount used in each area, and it is very difficult to mass produce

Method used

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  • Flexible device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Preparation of porous current collector: select a copper foil with a thickness of 1 μm as the base layer; select a copper foil with a thickness of 100 μm, and then use laser drilling to drill holes in the copper foil to obtain a circular hole shape and a hole diameter 2 μm, hole spacing (edges of two holes) of 1 μm, and hole depth of 100 μm, so as to obtain a porous structure layer of a porous current collector; the above porous structure layer and collective layer are cut, and then the porous structure layer is bonded with conductive glue Connected to the base layer to obtain a porous current collector for use;

[0039] Negative sheet preparation: use silicon-carbon composite (30% silicon content) as the negative electrode active material, PVDF as the binder, Supper-P as the conductive agent (the mass ratio of the three is 94:3:3), and NMP as the solvent configuration Slurry; then coated on the surface of the above-mentioned porous current collector containing the pore...

Embodiment 2

[0042] The difference from Example 1 is that it includes the following steps:

[0043] Preparation of porous current collector: copper foil with a thickness of 10 μm is selected as the base layer.

[0044] The rest are the same as in Embodiment 1 and will not be repeated here.

Embodiment 3

[0046] The difference from Example 1 is that it includes the following steps:

[0047] Preparation of porous current collector: select a copper foil with a thickness of 15 μm as the base layer; select a copper foil with a thickness of 100 μm, and then use laser drilling to drill holes on the copper foil to obtain a circular hole shape and a hole diameter The porous structure layer of the porous current collector is obtained by cutting the porous structure layer and the collective layer, and then using the conductive glue porous structure layer Bonded on the base layer to obtain a porous current collector for use;

[0048] Negative sheet preparation: use silicon-carbon composite (30% silicon content) as the negative electrode active material, PVDF as the binder, Supper-P as the conductive agent (the mass ratio of the three is 94:3:3), and NMP as the solvent configuration Slurry; then coated on the surface of the above-mentioned porous current collector containing the pore stru...

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Abstract

The invention belongs to the technical field of flexible devices, and particularly relates to a flexible device. The flexible device comprises a positive plate, a negative plate and an isolating membrane, the negative plate is composed of negative active materials and a negative current collector which is composed of a porous structural layer and a matrix layer, the porous structural layer comprises a pore structural region and a non-pore region, the sizes of the pore structural region and the non-pore region are V1 and V2 respectively, and V1 / (V1+V2) >= 10%; the negative active materials are distributed in pore structures of the porous structural layer or on the surface of the non-pore region of the porous structural layer, the mass of the active materials which are distributed in the pore structures of the porous structural layer is W1, the mass of the active materials which are distributed on the surface of the non-pore region of the porous structural layer is W2, and W1 / (W1+W2) >= 10%. According to the flexible device and a preparation method thereof, the porous current collector is adopted, the bonding force between the current collector and the active materials can be increased, tight bonding of interfaces of the flexible device in the bending process is guaranteed, and therefore the prepared flexible device is more excellent in flexibility and electro-chemical performance.

Description

technical field [0001] The invention belongs to the technical field of flexible devices, in particular to a flexible device and a preparation method thereof. Background technique [0002] In 1991, Sony Corporation of Japan creatively adopted carbon materials as the anode material of lithium-ion batteries, which brought revolutionary changes in the field of lithium-ion batteries; And a lot of use on other portable electrical appliances. Lithium-ion batteries have many advantages, such as high voltage, small size, light weight, high specific capacity, no memory effect, no pollution, small self-discharge, long cycle life, etc. It is an ideal power source for mobile appliances and electric vehicles in the 21st century. Power supply and electric storage for storage power station. [0003] However, with the development of electronic devices towards personalization, a large number of creative electronic products have emerged rapidly: wearable devices such as smart watches, smart ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/64H01M4/66H01M4/80H01M10/04
CPCH01M4/64H01M4/66H01M4/661H01M4/665H01M4/80H01M10/04Y02E60/10Y02P70/50
Inventor 杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH