Electrochemical device and electronic device

An electrochemical and insulating layer technology, applied in the field of electrochemistry, can solve problems such as affecting the adhesion between the insulating layer and the current collector, affecting the performance of lithium ion batteries, etc., to achieve good adhesion and improve safety performance.

Active Publication Date: 2021-11-09
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The inventors found that when the insulating layer is coated on the surface of the current collector, The crater-like protrusions shown in Figure 1, these crater-like protrusions will affect the adhesion between the insulating layer and the current collector, thereby affecting the performance of the lithium-ion battery

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

[0078]

[0079]

[0080] Add distilled water to the reactor and start stirring. After passing through nitrogen to remove oxygen for 2 hours, add the following monomers to the reactor at a mass ratio of 45:45:10: acrylonitrile, sodium acrylate and acrylamide, and heat to 65°C under an inert atmosphere. ℃ and keep a constant temperature, then add 20% ammonium persulfate solution as an initiator to start the reaction, take out the precipitate after 22 hours of reaction, add lye to neutralize the pH to 6.5. Wherein, the mass ratio among distilled water, monomer and initiator is 89.5:10:0.5. After the reaction, the reaction product is filtered, washed, dried, pulverized, sieved, etc. to obtain the binder.

[0081]

[0082] Disperse the prepared binder, inorganic particle boehmite and leveling agent polyethoxypropoxypropylene in deionized water, stir evenly until the viscosity of the slurry is stable, and obtain an insulating layer slurry with a solid content of 30%. , wherei...

Embodiment 2

[0098] Except that in , the mass percentage of the leveling agent in the total mass of the insulating layer is 0.18%, the rest is the same as that of Example 1.

Embodiment 3

[0100] Except that in , the mass percentage of the leveling agent in the total mass of the insulating layer is 0.30%, the rest is the same as that of Example 1.

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Abstract

The present application provides an electrochemical device and an electronic device. The electrochemical device comprises a positive electrode, the positive electrode comprising a current collector, the current collector comprising a coated region provided with an active material and an uncoated region not provided with an active material; the uncoated area is at least partially provided with an insulating layer, the insulating layer comprises a binder, inorganic particles and a leveling agent, and the number of crater-shaped protrusions in the insulating layer is 0 / cm < 2 > to 0.25 / cm < 2 >. According to the invention, the number of crater-shaped bulges in the insulating layer can be eliminated or reduced, and the insulating layer and the current collector have good binding power, so that the safety 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. [0003] Lithium-ion batteries generally include a positive electrode, a negative electrode, and a separator between the positive and negative electrodes. The positive electrode usually includes a current collector, an active material layer, and an insulating layer, wherein the insulating layer is usually provided on the surface of the current collector where no active material layer is provided, so as to improve the overall insulation performance of the positive electrode. The inventors have found that when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/04H01M10/0525H01M4/13
CPCH01M10/0525H01M10/04H01M4/13Y02P70/50Y02E60/10
Inventor 刘晓欠王可飞韩冬冬刘胜奇
Owner DONGGUAN AMPEREX TECH
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