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Electrochemical device
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An electrochemical and softening temperature technology, applied in the direction of electrochemical generators, circuits, positive electrodes, etc., can solve the problems of lithium-ion battery capacity decline, slow transmission, excessive bonding, etc., to achieve good electrolyte transmission and improve circulation Performance, cycle life extension effect
Pending Publication Date: 2020-11-17
DONGGUAN POWERAMP TECH LTD
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Problems solved by technology
On the one hand, the oily polyvinylidene fluoride bonding coating has good interfacial adhesion, but it also makes the bonding of the bonding coating to the overall interface of the positive or negative electrode sheet too strong, which leads to electrolysis The transmission of the liquid between the separator and the positive or negative pole is slow. During the cycle, the electrolyte in the middle of the positive or negative pole is not replenished in time, and lithium / black deposits occur in the middle of the positive or negative pole. Spots, causing a sharp drop in the capacity of lithium-ion batteries, greatly reducing the cycle life of lithium-ion batteries
On the other hand, the use of weakly cohesive water-based PVDF bonding coating, due to the weak bonding force, the separation film in the head and tail area of the electrode assembly and the interface between the positive electrode sheet and the negative electrode sheet is prone to separation, resulting in The ion channels between the sheets are disconnected, which leads to lithium precipitation / black spots, causing a sharp drop in the capacity of the lithium-ion battery and greatly reducing the cycle life of the lithium-ion battery
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[0039] An exemplary production method of the separator of the present application is described below. The method comprises: dissolving two kinds of binders in water respectively, forming a uniform slurry by mechanical stirring, and coating the two kinds of slurry to a porous substrate (or a third coating (for example, an inorganic coating) on the porous substrate respectively. coating)), where two slurry coatings are applied to two different areas (for example, see figure 1 ), where the first coat 1 is located in the high-viscosity area and the second coat 2 is located in the low-viscosity area.
[0040] To coat the slurry on the surface of the porous substrate, any method known to those skilled in the art may be used, including dip coating, die coating, roll coating, knife coating, or combinations thereof.
[0041] In this application, a lithium ion battery is only used as an exemplary embodiment of an electrochemical device, and the electrochemical device may also includ...
Embodiment 1
[0089] The preparation method is the same as that of Comparative Example 1, but the difference is that the preparation method of the isolation film of Example 1 is: the first binder polyvinylidene fluoride and the second binder polyvinylidene fluoride are dissolved in water respectively, and mechanically Stir to form a uniform slurry, wherein the particle size of the first binder is 0.05 μm, the particle size of the second binder is 0.5 μm, and the first binder slurry and the second binder slurry are coated separately To the corresponding regions on both sides of the porous substrate (polyethylene, thickness 5 μm, average pore diameter 0.073 μm, porosity 26%) of the ceramic coating that has been coated with a thickness of 2 μm on both sides (as follows figure 1 shown), after drying, a separator is formed, wherein the width W1 of the first coating where the first binder is located is 10 mm, and the coating thickness is 0.5 μm, which is located in the high-viscosity area, and th...
Embodiment 2
[0091] Consistent with the preparation method of Example 1, the difference is that the particle size of the first binder in Example 2 is 0.4 μm, the particle size of the second binder is 1.3 μm, and the coating thickness of the first coating is 4 μm, the coating thickness of the second coating is 4 μm, the coverage of the first adhesive in the high-viscosity area is 31%, and the coverage of the second adhesive in the low-viscosity area is 22%.
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Abstract
The invention provides an electrochemical device. The electrochemical device comprises a positive pole piece; a negative electrode plate; and an isolating membrane arranged between the positive pole piece and the negative pole piece. The isolating membrane comprises a porous base material, a first coating and a second coating, wherein the first coating and the second coating are located on the surface of the porous base material, the first coating is arranged on at least one side of the second coating, the first coating comprises a first binder, and the second coating comprises a second binder. And the bonding force between the first coating and the positive pole piece or the negative pole piece is greater than that between the second coating and the positive pole piece or the negative pole piece. The isolating membrane provided by the invention not only can obtain good bonding force with the positive pole piece or the negative pole piece, but also can realize good electrolyte transmission at the interface of the isolating membrane and the positive pole piece or the negative pole piece, so that the cycle performance of an electrochemical device is improved.
Description
technical field [0001] The present application relates to the field of electrochemical devices, and more particularly, to electrochemical devices. Background technique [0002] At present, the adhesive coatings of commercial separators mainly include oily polyvinylidene fluoride (PVDF) with high adhesion and water-based PVDF with weak adhesion. On the one hand, the oily polyvinylidene fluoride bonding coating has good interfacial adhesion, but it also makes the bonding of the bonding coating to the overall interface of the positive or negative electrode sheet too strong, which leads to electrolysis The transmission of the liquid between the separator and the positive or negative pole is slow. During the cycle, the electrolyte in the middle of the positive or negative pole is not replenished in time, and lithium / black deposits occur in the middle of the positive or negative pole. spots, causing the capacity of the lithium-ion battery to drop sharply, greatly reducing the cyc...
Claims
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Application Information
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