Flexible electrode plate with coating layer and preparation method of flexible electrode plate

A flexible electrode and coating technology, applied in the field of electrochemistry, can solve the problems of bulky, damaged, non-flexible, etc., and achieve the effect of increasing the contact area, increasing the contact area, and improving flexibility

Active Publication Date: 2018-01-19
柔电(武汉)科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In existing lithium-ion batteries, current collectors usually use metal sheets, such as copper foil and aluminum foil. However, these metal sheets generally cannot be bent and squeezed, and are not flexible, so lithium-ion batteries have considerable hardness, which is unacceptable due to Deformation caused by external force
If the lithium-ion battery is deformed, it will destroy the interface between the positive and negative electrodes and the diaphragm, resulting in deterioration of battery performance and affecting the normal use of end users. At the same time, the existing lithium-ion batteries are prone to leakage, and the safety needs to be further improved.
[0004] With the rapid development of electronic technology, more and more electronic devices are developing towards thinner and more flexible. For example, Samsung and LG have launched their own flexible and foldable screens, and are planning to launch foldable mobile phones. Currently, display components and circuits can be flexible and foldable. The biggest challenge at present is the energy storage power products that can be folded. Traditional lithium-ion batteries, super capacitors and other products are not only bulky, but also cannot be folded. When the volume change is too large, it may even lead to a short circuit between the positive and negative electrodes, causing thermal runaway and causing serious safety problems

Method used

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  • Flexible electrode plate with coating layer and preparation method of flexible electrode plate
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  • Flexible electrode plate with coating layer and preparation method of flexible electrode plate

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preparation example Construction

[0036] The preparation method of the flexible electrode sheet with coating layer in the present invention specifically comprises the following steps:

[0037] (1) Dispersion: use organic solvent or deionized water as the solvent for the conductive agent, and ultrasonically disperse it at a dispersion concentration of 0.1-2 mg / ml to form a conductive agent slurry; use an organic solvent or deionized water as the solvent for the fiber body, High-speed stirring dispersion, the dispersion concentration is 0.5 ~ 3mg / ml.

[0038] (2) Stir and homogenize: first add the binder to the conductive agent slurry in step (1) and disperse for 2 to 3 minutes, then add the active material, mix well, and then add to the conductive agent slurry in step (1) to disperse well The fibrous body is then fully stirred and mixed evenly to form a suspension slurry.

[0039] (3) Pour the suspension slurry obtained in step (2) into a filter paper suction filter, the filter paper material is preferably cel...

Embodiment 1

[0048] Add carbon nanotubes with a mass fraction of 5% to isopropanol and sonicate for 20 minutes to prepare a conductive agent slurry; disperse lithium cobaltate particles with a mass fraction of 87% in the conductive agent slurry, stir at high speed for 10 minutes, and cobalt acid Lithium particles according to surface density 20mg / cm 2 Prepare a mixed solution of conductive agent 1 and active material; then take nanocellulose with a mass fraction of 8% as a fiber body, add isopropanol to high-speed stirring and disperse for 5 minutes, and mix the dispersed fiber body with the prepared conductive agent 1 and the active material. The mixtures were mixed with each other and stirred at high speed for 10 minutes to prepare a suspension slurry; the suspension was poured into cellulose filter paper for vacuum filtration, and after the filtrate was completely drained, the filter paper and the filtered sediment were removed together and dried , the drying temperature was 120°C, and ...

Embodiment 2

[0052] Take a graphene slurry with a mass fraction of 5% and add it into deionized water for ultrasonication for 20 minutes to prepare a conductive agent slurry; disperse graphite particles with a mass fraction of 89% in the conductive agent slurry, stir at high speed for 15 minutes, and the graphite particles are pressed on the surface. Density 30mg / cm 2 Prepare a mixed solution of conductive agent 1 and the active substance; then take nanocellulose with a mass fraction of 5% as a fiber body and add it to deionized water for high-speed stirring and disperse for 12 minutes, and mix the dispersed fiber body with the prepared conductive agent 1 and the active substance The mixed liquids were mixed with each other and stirred at high speed for 20 minutes to prepare a suspension slurry; secondly, nanofibers with a mass fraction of 1% were selected as the cushion material, and the cushion material was dispersed in deionized water for 3 minutes at a high speed, and the surface densit...

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Abstract

The invention provides a flexible electrode plate with a coating layer. The flexible electrode plate comprises an electrode plate substrate and a coating layer, wherein the coating layer at least coats one side of the electrode plate substrate; the electrode plate substrate comprises a fiber body, an active substance and a conductive agent I; the fiber body is a nanofiber or multi-dendritic fiber;the active substance and the conductive agent I are dispersed into the fiber body; the active substance is a positive electrode material or negative electrode material for a lithium-ion battery; thecoating layer comprises mixed slurry of a binder II, a surfactant and a conductive agent II; and the conductive agent II is nitrogen-doped three-dimensional graphene hollow microspheres. According tothe electrode plate, the active substance is uniformly dispersed into the fiber body through the self-supporting role of the fiber body, so that the electrode plate has certain flexibility; and meanwhile, the electrode plate substrate is coated with a layer of slurry of the coating layer, so that the network structure of original carbon is reserved through the dispersed nitrogen-doped graphene hollow microspheres, the contact area of the nitrogen-doped graphene hollow microspheres and a solvent is increased, the contact area of the nitrogen-doped graphene hollow microspheres and a reactive material is greatly increased and the conductivity of the coating layer is well improved, thereby improving the electrical property of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a flexible electrode sheet with a coating layer and a preparation method thereof. Background technique [0002] With the development of science and technology and the improvement of people's material and cultural living standards, people's demand for batteries is increasing, and the requirements for battery performance are also getting higher and higher. Especially with the development of space technology and the demand for military equipment, the rapid development of the information and microelectronics industry brings a large number of industrial, civil, medical, and portable electronic products, the research and development of electric vehicles, and environmental protection. With the enhancement of awareness, people have more urgent needs for batteries that are small in size, light in weight, high in energy, safe and reliable, pollution-free, and rechargea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/131H01M4/133H01M4/139H01M4/1391H01M4/1393H01M4/04H01M4/62H01M10/0525
CPCY02E60/10
Inventor 熊红波胡韬解明
Owner 柔电(武汉)科技有限公司
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