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Electrochemical device and electronic device

An electrochemistry, electrode pole piece technology, applied in the field of electrochemistry, can solve the problems of poor uniformity of pore size in the isolation layer, self-discharge, affecting the performance of lithium ion batteries, etc., to improve the degree of uniformity, improve rate performance and safety, The effect of improving the self-discharge problem

Pending Publication Date: 2021-10-22
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the fiber structure in the existing isolation layer, the size uniformity of the pores in the isolation layer is poor, resulting in serious self-discharge problems in lithium-ion batteries, which affect the performance of lithium-ion batteries

Method used

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  • Electrochemical device and electronic device
  • Electrochemical device and electronic device
  • Electrochemical device and electronic device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097]

[0098] The negative active material graphite, conductive carbon black, and styrene-butadiene rubber were mixed according to the mass ratio of 96:1.5:2.5, and deionized water was added as a solvent to prepare a slurry with a solid content of 70%, and stirred evenly. The slurry was evenly coated on one surface of a copper foil with a thickness of 8 μm, and dried at 110° C. to obtain a negative electrode sheet.

[0099] After the above steps are completed, the single-side coating of the negative electrode sheet has been completed. Afterwards, these steps are also completed on the back of the pole piece in a completely consistent manner, that is, a double-sided coated negative pole piece is obtained. After the coating is completed, the pole piece is cut into (41mm×61mm) specifications for use.

[0100]

[0101] The positive electrode active material lithium cobaltate (LiCoO 2 ), conductive carbon black, and polyvinylidene fluoride (PVDF) in a mass ratio of 97.5︰1.0︰...

Embodiment 2、 Embodiment 3、 Embodiment 4

[0111] Except in , the fiber separation layer was prepared according to the process parameters shown in Table 1, so that the average pore size, thickness, porosity, tortuosity, and tortuosity of the obtained fiber separation layer were as shown in Table 1. Except that shown, all the other are identical with embodiment 1.

Embodiment 5

[0113] Except that is different from Example 1, the others are the same as Example 1.

[0114]

[0115] Disperse silicon dioxide (average particle size of 2 μm) in a mixed solvent of DMF:acetone=7:3, and stir until the viscosity of the slurry is stable, and obtain slurry A with a solid content of 40% as a raw material.

[0116] Spray the spinning solution and slurry A on the surface of the positive electrode active material layer of the positive electrode sheet by electrospraying, so that the inorganic particle silica is prepared on the surface of the positive electrode sheet synchronously, and fibers with inorganic fillers in the gaps between the polymer fibers are obtained. Isolation layer. The thickness, average pore diameter, thickness, porosity, tortuosity, tortuosity, etc. of the fiber isolation layer are shown in Table 1.

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Abstract

The invention provides an electrochemical device and an electronic device. The electrochemical device comprises an electrode plate, the electrode plate comprises a current collector and an active substance layer, at least one surface of the electrode plate is provided with a fiber isolation layer, the fiber isolation layer comprises polymer fibers, and the tortuosity tau 0 of the polymer fibers is larger than 1.2 and smaller than 1.9. The fiber isolation layer improves the self-discharge problem of the electrochemical device, so that the performance of the electrochemical device is improved.

Description

technical field [0001] The present application relates to the field of electrochemical technology, in particular to an electrochemical device and an electronic device. Background technique [0002] Lithium-ion batteries have the characteristics of large specific energy, high working voltage, low self-discharge rate, small size, and light weight, and are widely used in various fields such as electric energy storage, portable electronic devices, and electric vehicles. With the rapid development of electric vehicles and mobile electronic devices, people's performance requirements for lithium-ion batteries are also increasing, such as high energy density requirements. [0003] By using electrospinning technology to prepare the isolation layer directly on the surface of the pole piece, the thickness of the isolation layer can be reduced to increase the energy density of the lithium-ion battery. However, due to the influence of the fiber structure in the existing isolation layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/46H01M50/44H01M50/414H01M50/443H01M50/431H01M50/446H01M4/13H01M10/0525
CPCH01M50/46H01M50/44H01M50/414H01M50/443H01M50/431H01M50/446H01M4/13H01M10/0525Y02E60/10
Inventor 曾志鹏张益博魏红梅翁秋燕
Owner NINGDE AMPEREX TECH
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