Preparation method of lithium ion battery ceramic composite membrane

A lithium-ion battery and ceramic composite technology, which is applied in the direction of secondary batteries, battery pack components, circuits, etc., can solve problems such as weak bonding force and ceramic layer shedding, and achieve high porosity, good thermal stability, and long service life long effect

Inactive Publication Date: 2016-09-21
袁春华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: Aiming at the weak bonding force between the ceramic layer and the base film of the currently prepared ceramic composite diaphragm, and the problem that the ceramic layer is prone to falling off, the present invention provides a preparation of a ceramic composite diaphragm for a lithium ion battery Method, the present invention prepares superfine alumina by the method for hydrolyzing al

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] Weigh 30g of aluminum isopropoxide, add 80mL of isopropanol aqueous solution with a mass fraction of 88%, stir at 200r / min in a constant temperature water bath at 80°C, hydrolyze for 4 hours, and distill under reduced pressure until all solvents are evaporated to obtain hydration oxidation aluminum, put hydrated alumina in a tube furnace, and roast at 1200°C for 5 hours to obtain ultrafine alumina powder; weigh 5g of the above ultrafine alumina powder, add it to a ball mill jar, add 20mL deionized water, 2mL poly Acrylic acid, 0.5mL n-octanoic acid, 1mL polyether modified silicone oil, adding grinding zirconium beads according to the ratio of ball to material 3:2, after ball milling at 300r / min for 10h, adding 10mL 10% polyvinyl alcohol aqueous solution, 1mL polyethylene glycol Alcohol, continue ball milling for 10 hours, transfer to a vacuum defoamer for vacuum defoaming, take it out, and obtain alumina slurry; measure 38mL of acetone, 21mL of N, N-dimethylformamide, mi...

example 2

[0020]Weigh 35g of aluminum isopropoxide, add it to 90mL of 88% isopropanol aqueous solution, stir at 250r / min in a constant temperature water bath at 82°C, hydrolyze for 4.5h, and distill under reduced pressure until all the solvent is evaporated to obtain hydration Alumina, put hydrated alumina in a tube furnace, and roast at 1220°C for 5.5 hours to obtain ultrafine alumina powder; weigh 6g of the above ultrafine alumina powder, add it to a ball mill jar, add 25mL of deionized water, 2.5mL polyacrylic acid, 0.8mL n-octanoic acid, 1.5mL polyether modified silicone oil, add grinding zirconium beads according to the ratio of ball to material 3:2, after ball milling at 350r / min for 11h, add 15mL of 10% polyvinyl alcohol aqueous solution, 1.5mL polyethylene glycol, continue ball milling for 11h, transfer to a vacuum defoamer for vacuum defoaming, take out to obtain alumina slurry; measure 39mL acetone, 21.5mL N, N-dimethylformamide, mix well, Add 1.3g of polyvinylidene fluoride p...

example 3

[0023] Weigh 40g of aluminum isopropoxide, add 100mL of 88% isopropanol aqueous solution into 100mL of isopropanol aqueous solution, stir at 300r / min in a constant temperature water bath at 85°C, perform hydrolysis reaction for 5h, and distill under reduced pressure until all solvents are evaporated to obtain hydrated oxidation aluminum, put hydrated alumina in a tube furnace, and roast at 1250°C for 6 hours to obtain superfine alumina powder; weigh 8g of the above superfine alumina powder, add it to a ball mill jar, add 30mL deionized water, 3mL poly Acrylic acid, 1.0mL n-octanoic acid, 2mL polyether modified silicone oil, add grinding zirconium beads according to the ratio of ball to material 3:2, after ball milling at 400r / min for 12h, add 20mL 10% polyvinyl alcohol aqueous solution, 2mL polyethylene glycol Alcohol, continue ball milling for 12 hours, transfer to a vacuum defoamer for vacuum defoaming, take it out, and obtain alumina slurry; measure 40mL of acetone, 22mL of ...

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PUM

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Abstract

The invention relates to a preparation method of a lithium ion battery ceramic composite membrane, and belongs to the technical field of battery membranes. In order to solve the problems that the binding force between a ceramic layer and a base membrane of a ceramic composite membrane prepared at present is relatively weak and the ceramic layer is easy to fall off, the preparation method of the lithium ion battery ceramic composite membrane provided by the invention comprises the following steps: preparing superfine aluminum oxide through a method for hydrolyzing aluminum isopropoxide, ball-milling the superfine aluminum oxide with sizing agent with dispersing agent polyacrylic acid, deforming agent n-caprylic acid, surfactant polyether modified silicone, binder polyvinyl alcohol solution and plasticizer polyethylene glycol, configuring into a sizing agent, coating the sizing agent on a polyethylene film, and spraying polyvinylidene fluoride onto the ceramic layer with an electrostatic spraying method so as to prepare the ceramic composite membrane of a sandwich structure. A ceramic particle layer is restricted between the polyethylene film and the polyvinylidene fluoride film, so that the falling of ceramic particles is effectively avoided.

Description

technical field [0001] The invention relates to a preparation method of a lithium-ion battery ceramic composite diaphragm, which belongs to the technical field of battery diaphragms. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and high safety performance, and are widely used in portable digital electronic products such as personal computers, cameras, and mobile phones. Lithium ion battery is a kind of concentration difference battery, its working process is Li + The process of intercalation and deintercalation back and forth between the positive and negative electrodes is vividly called a rocking chair battery. A typical lithium-ion battery usually consists of a separator, electrolyte, positive and negative electrodes. The positive electrode is generally a compound of transition metal oxide and lithium (such as lithium cobaltate, lithium manganate, etc.), and the negative electrode is composed of carbon m...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/434
CPCH01M10/0525H01M50/403H01M50/449Y02E60/10
Inventor 袁春华王龙
Owner 袁春华
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