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Quick-charging lithium ion battery with excellent safety performance and preparation method thereof

A lithium-ion battery, safety performance technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, climate sustainability, etc., can solve the problems of lithium ion flow rate reduction, positive and negative short circuit, battery rate performance decline, etc.

Inactive Publication Date: 2017-03-01
RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Conventional PE, PP isolation film, its molecular structure is mainly -CH 2 - The functional group makes its own melting point relatively low, around 140°C. Based on various safety test results, it is shown that when the temperature of the lithium-ion battery reaches 130°C, the PE or PP separator will undergo a large heat shrinkage, resulting in If the positive and negative poles are short-circuited, the heat of the battery will increase sharply in a short period of time, causing fire or even explosion, resulting in more dangerous safety accidents
In response to this situation, one solution is to coat a layer of ceramic layer on the isolation film to reduce heat shrinkage and prevent short circuit of the positive and negative electrodes, but this is contrary to the initial function of the isolation film, although it plays the role of isolation The role of positive and negative electrodes, but this ordinary ceramic layer will block the channel for lithium ion conduction when coated on the separator, the rate of lithium ion circulation will be greatly reduced, and the rate performance of the battery will drop sharply

Method used

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  • Quick-charging lithium ion battery with excellent safety performance and preparation method thereof
  • Quick-charging lithium ion battery with excellent safety performance and preparation method thereof
  • Quick-charging lithium ion battery with excellent safety performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Separator Coating Slurry:

[0034] Dissolve 0.02Kg of sodium carboxymethylcellulose powder in deionized water in a blender, mix well and add 3.0Kg of alumina powder and 0.3Kg of petroleum ether (boiling point is 50°C, pentane / hexane mass ratio = 3:2 ), after dispersing for 2 hours, put it in a ball mill and grind it for 30 minutes, add 0.9Kg of PAA latex with 50% solid content to the ground slurry, continue to stir for 1 hour, and then grind it in a ball mill for 30 minutes to obtain a slurry The material is filtered through a 500-mesh filter for later use.

[0035] Composite diaphragm preparation

[0036] The slurry prepared as described above was coated on a polyethylene microporous film with a thickness of about 7 μm by using a reverse roll gravure coater, and the coating thickness was about 2-5 μm. Pass the separator coated with slurry on one side sequentially through three temperature-controlled ovens in series (the temperature is from high to low,...

Embodiment 2

[0040] In a blender, dissolve 0.02Kg of sodium carboxymethylcellulose powder in deionized water, mix well and add 3.0Kg of alumina powder and 0.6Kg of petroleum ether (boiling point is 50°C, pentane / hexane = 3:2) After dispersing for 2 hours, put it in a ball mill and grind it for 30 minutes, add 0.9Kg of PAA latex with a solid content of 50% to the ground slurry, continue stirring for 1 hour, and then put it in a ball mill and grind it for 30 minutes to obtain a slurry , 500-mesh filter for later use.

[0041] Other than that, the others are the same as in Example 1.

Embodiment 3

[0043]In a blender, dissolve 0.02Kg of sodium carboxymethylcellulose powder in deionized water, mix well and add 3.0Kg of alumina powder and 0.9Kg of petroleum ether (boiling point is 50°C, pentane / hexane = 3:2) After dispersing for 2 hours, put it in a ball mill and grind it for 30 minutes, add 0.9Kg of PAA latex with a solid content of 50% to the ground slurry, continue stirring for 1 hour, and then put it in a ball mill and grind it for 30 minutes to obtain a slurry , 500-mesh filter for later use.

[0044] Other than that, the others are the same as in Example 1.

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Abstract

The invention relates to the technical field of lithium ion battery, especially to a quick-charging lithium ion battery with excellent safety performance and a preparation method thereof. The battery mainly comprises a positive plate, a diaphragm and a negative plate. The surface of the diaphragm is coated with a special ceramic layer, which contains a specific foaming agent material. Thus, the originally-compact ceramic coating contains uniform gaps and pores. The lithium ion battery using the diaphragm has high ionic conductance and safety performance. Especially, quick-charging performance and safety performance of the lithium ion battery are greatly improved.

Description

technical field [0001] The invention relates to a fast-charging lithium-ion battery with excellent safety performance and a preparation method thereof, which includes a high-safety diaphragm coated with a special ceramic layer, and the prepared lithium-ion battery has excellent safety performance. Background technique [0002] Lithium-ion batteries have been widely used as power sources for various mobile devices since their commercialization due to their high energy density, high operating voltage, no memory effect, and long cycle life. With the large-scale application of lithium-ion batteries, battery safety issues have become increasingly prominent. [0003] The main components of lithium-ion batteries include positive electrodes, negative electrodes, separators, and electrolytes. The separator is inserted between the positive and negative electrodes in turn, and its main functions are: physically isolate the positive and negative electrodes of the lithium-ion battery to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/058H01M50/434H01M50/449
CPCH01M10/058H01M50/40H01M50/409H01M50/403Y02E60/10Y02P70/50
Inventor 牛磊田甜宋韶灵吴可吴宁宁
Owner RISESUN MENGGULI NEW ENERGY SCIENCE & TECHNOLOGY CO LTD