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Boehmite-containing ceramic coating lithium battery structure

A ceramic coating, lithium battery technology, used in secondary batteries, structural parts, battery pack components, etc., can solve problems such as troublesome operation, battery fire, explosion, etc., to prevent heat diffusion, control thermal runaway, energy high density effect

Pending Publication Date: 2019-10-22
江西力能新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements, but With the development of science and technology, lithium batteries have become the mainstream now; existing lithium batteries have certain disadvantages in use, first of all, it is impossible to avoid short circuits caused during use, and it is difficult to reduce the corrosion of electrode terminal materials , so that the service life cannot be improved, and the electrolyte cannot be replaced at the same time, it is difficult to increase the utilization rate of the battery, and finally the safety performance of the battery cannot be improved. Lithium dendrites generated during the use of the battery will pierce the diaphragm, resulting in a short circuit, causing unsafe phenomena such as fire, explosion, and scrapping of the battery

Method used

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  • Boehmite-containing ceramic coating lithium battery structure
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  • Boehmite-containing ceramic coating lithium battery structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 1-6 As shown, a boehmite-containing ceramic coating lithium battery structure includes a battery main body 4, and the battery main body 4 includes a diaphragm one 404, a positive electrode sheet 403, a diaphragm two 402, Negative electrode sheet 401 and separator three 400, negative electrode sheet 401 is provided with current collector 4012, is welded with negative electrode ear 406 on collector body 4012, is provided with positive electrode ear 405 on described positive electrode sheet 403, described positive electrode sheet 403 and / or negative electrode sheet 401 is coated with polymer coating 407;

[0036] The upper surface of the battery body is equipped with a positive cap 2, and the side surface of the positive cap 2 is uniformly provided with through holes 3;

[0037] The outer surface of the battery main body 4 is provided with a casing 1, the casing 1 is cylindrical, the casing 1 is filled with electrolyte, the battery main body 4 is immersed ...

Embodiment 2

[0040] This embodiment is a further optimization made on the basis of Example 1, specifically the preparation method of the polymer coating is as follows:

[0041] S1: Add ceramic mixed powder, dispersant, and water into a ball mill, mill for 0.5 hours, then add binder, and continue milling for 20 minutes to prepare a slurry;

[0042] S2: Coat the slurry obtained after dispersion on both sides of the positive electrode sheet 403 and the negative electrode sheet 401 of the lithium battery, and the thickness of the coating layer is 1 μm;

[0043] S3: Drying: Put the positive electrode sheet 403 and the negative electrode sheet 401 coated in step S3 into a vacuum drying oven for drying at a drying temperature of 60°C.

[0044] The dispersant is acrylic acid-2-acrylamide-2-methylpropanesulfonic acid copolymer.

[0045] The binder described in this embodiment adopts polyvinyl alcohol.

[0046] The quality of the dispersant is 0.5% of the mass of the ceramic mixed powder, the qual...

Embodiment 3

[0050] This embodiment is a further optimization made on the basis of Example 1, specifically the preparation method of the polymer coating is as follows:

[0051] S1: Add ceramic mixed powder, dispersant, and water into a ball mill, mill for 1.5 hours, then add binder, and continue milling for 30 minutes to prepare a slurry;

[0052] S2: Coat the slurry obtained after dispersion on both sides of the positive electrode sheet 403 and the negative electrode sheet 401 of the lithium battery, and the thickness of the coating layer is 2 μm;

[0053] S3: Drying: Put the positive electrode sheet 403 and the negative electrode sheet 401 coated in step S3 into a vacuum drying oven for drying at a drying temperature of 70°C.

[0054] The dispersant sodium polyacrylate.

[0055] The binder described in this embodiment adopts polyvinyl alcohol.

[0056] The quality of the dispersant is 2% of the mass of the ceramic mixed powder, the quality of the binder is 6% of the mass of the ceramic...

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Abstract

The invention discloses a boehmite-containing ceramic coating lithium battery structure. The boehmite-containing ceramic coating lithium battery structure comprises a battery main body, wherein the battery main body comprises a diaphragm I, a positive plate, a diaphragm II, a negative plate and a diaphragm III which are sequentially wound from inside to outside, a current collector is arranged onthe negative plate, a negative electrode tab is welded on the current collector, a positive electrode tab is arranged on the positive plate, and a polymer coating coats the positive plate and / or the negative plate; the upper surface of the battery main body is provided with a positive electrode cap, and the side surface of the positive electrode cap is uniformly provided with through holes; a shell is arranged at the outer surface of the battery main body, the shell is cylindrical, electrolyte is injected into the shell, the battery body is immersed below the liquid level of the electrolyte, an anode cap is arranged on the upper surface of the shell, the anode tab is connected with the anode cap, the cathode tab is connected with the bottom portion of the shell, an insulating gasket is arranged on the lower surface of the shell, and a coating layer is arranged at the outer portion of the shell. The boehmite-containing ceramic coating lithium battery structure has the excellent electrical performance, is safe and reliable, and is not easy to fall off.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a lithium battery structure with a ceramic coating containing boehmite. Background technique [0002] Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements, but With the development of science and technology, lithium batteries have become the mainstream now; existing lithium batteries have certain disadvantages in use, first of all, it is impossible to avoid short circuits caused during use, and it is difficult to reduce the corrosion of electrode terminal materials , so that the service life cannot be improved, and the electrolyte cannot be replaced at the same time, it is difficult to increase the utilization rate of the batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M50/403Y02E60/10Y02P70/50
Inventor 侯伟侯民郭农庆
Owner 江西力能新能源科技有限公司
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