Electrochemical device and electronic device including the same

An electrochemical and content technology, applied in the field of electrochemistry, can solve the problem of difficult to take into account the cycle performance and safety performance of lithium-ion batteries, and achieve the effect of reducing the problem of lithium precipitation at the corner, improving the extrusion force, and increasing the interface gap.

Pending Publication Date: 2022-04-29
DONGGUAN AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the separator is one of the important parameters affecting the performance of lithium-ion batteries, but the existing separators are difficult to balance the cycle performance and safety performance of lithium-ion batteries

Method used

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  • Electrochemical device and electronic device including the same
  • Electrochemical device and electronic device including the same
  • Electrochemical device and electronic device including the same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0048] The present application has no particular limitation on the preparation methods of the first diaphragm and the second diaphragm, as long as the purpose of the present application can be achieved.

[0049] The present application has no particular limitation on the negative electrode collector, as long as the purpose of the present application can be achieved. For example, the negative electrode current collector may include copper foil, copper alloy foil, nickel foil, stainless steel foil, titanium foil, nickel foam, copper foam, or a composite current collector. The first active material layer and the second active material layer of the present application each independently contain a negative electrode active material. The present application has no particular limitation on the type of the negative electrode active material, as long as the purpose of the present application can be achieved. For example, the negative electrode active material may contain natural graph...

Embodiment 1

[0066]

[0067] The flaky boehmite and carboxymethyl cellulose are mixed according to the mass ratio of 40:3 and dissolved in deionized water to form a flaky boehmite with a solid content of 40wt% and a solid content of carboxymethyl cellulose 3wt% slurry of the first inorganic material layer. Subsequently, the slurry of the first inorganic material layer was coated on one side of the substrate layer (polyethylene, with a thickness of 5 μm and a porosity of 42%) by dimple coating method, and dried to obtain the first inorganic material layer (thickness of 4 μm) with a double-layer structure of the first substrate layer.

[0068] The first adhesive polyvinylidene fluoride was dissolved into deionized water to form a first adhesive layer slurry with a solid content of 35 wt%. Subsequently, the first adhesive layer slurry was uniformly coated on both surfaces of the above-mentioned double-layer structure by the dimple coating method to form two first adhesive layers (with a th...

Embodiment 2 to Embodiment 14

[0082] Except for adjusting relevant preparation parameters according to Table 1, the rest are the same as in Example 1.

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Abstract

The invention provides an electrochemical device and an electronic device comprising the electrochemical device, and in the electrochemical device, the bonding force between a first active material layer and a second coating is smaller than the bonding force between the second active material layer and a fourth coating. By regulating and controlling the relationship between the bonding force between the first active material layer and the second coating and the bonding force between the second active material layer and the fourth coating, the bonding force between the first active material layer and the second coating is lower, and the bonding force between the long surface of the negative pole piece easy to separate out lithium and the first diaphragm is further reduced, so that the service life of the negative pole piece is prolonged. The extrusion stress condition at the corner of the electrochemical device is improved, the interface gap at the corner is increased, infiltration of more electrolyte at the corner is facilitated, and the risk that an electrolyte broken bridge phenomenon is formed at the corner of the electrochemical device is reduced. Therefore, the corner interface of the electrochemical device is improved, so that the safety performance and the cycle performance of the electrochemical device are improved.

Description

technical field [0001] The present application relates to the field of electrochemistry, in particular to an electrochemical device and an electronic device including the electrochemical device. Background technique [0002] As a new type of mobile energy storage device, secondary batteries (such as lithium-ion batteries) have the advantages of high energy storage density, high open circuit voltage, low self-discharge rate, long cycle life, and good safety, and are widely used in electric energy storage. , mobile electronic equipment, electric vehicles and aerospace equipment and other fields. [0003] Among them, the separator is one of the important parameters affecting the performance of lithium-ion batteries, but the existing separators are difficult to balance the cycle performance and safety performance of lithium-ion batteries. Contents of the invention [0004] The present application provides an electrochemical device and an electronic device including the electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0525H01M10/0587H01M50/46
CPCH01M50/461H01M10/0587H01M10/0525Y02P70/50Y02E60/10H01M10/0431H01M50/46H01M10/052H01M4/366H01M4/602H01M4/622H01M2004/027H01M2004/028
Inventor 林圣增
Owner DONGGUAN AMPEREX TECH
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