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Battery

A battery and negative electrode technology, applied in secondary batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as thermal runaway and ignition, and achieve the effect of reducing battery temperature and improving safety performance

Inactive Publication Date: 2016-11-09
CONTEMPORARY AMPEREX TECH CO
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  • Summary
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  • Claims
  • Application Information

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Problems solved by technology

These safety coatings have played a certain role in the application of batteries, but when these conventional inorganic particles are applied to large-capacity batteries, especially power batteries, they cannot effectively suppress the rapid increase of current and temperature rise, which may easily cause thermal runaway and fire phenomenon

Method used

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preparation example Construction

[0050] The present application also provides a method for preparing the above-mentioned positive electrode sheet, negative electrode sheet or separator containing a flame retardant coating, comprising the following steps:

[0051] (1) Take the inorganic hydroxide flame retardant and deionized water, and stir under vacuum conditions; wherein, the mass ratio of the inorganic hydroxide flame retardant to the deionized water is 10-30:90-70;

[0052] (2) Add nitrogen-based flame retardant, stir and mix;

[0053] (3) Add the binding agent, stir and mix, and the stirring speed and stirring time are greater than the stirring speed and stirring time of the stirring described in step (1) and step (2); preferably, add the binding agent For adding an emulsion or solution containing 15 to 45 wt% of the binder;

[0054] (4) reduce the stirring speed, close the vacuum after continuing to stir in a vacuum environment, and filter the prepared slurry for subsequent use after the air pressure i...

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Abstract

The invention relates to the technical field of batteries, in particular to a battery. A flame retardant coating is arranged on the surface of at least one of the positive plate, the negative plate and the insulating membrane of the battery, wherein the flame retardant coating contains a nitrogenated flame retardant, an inorganic hydroxide flame retardant and a binder; the nitrogenated flame retardant and the inorganic hydroxide flame retardant can play a synergistic flame retardation effect, specifically the decomposition temperature ranges of the nitrogenated flame retardant and the inorganic hydroxide flame retardant are complementary, that is, the inorganic hydroxide flame retardant decomposes at a relatively low temperature ranging from 200-340 DEG C, while the nitrogenated flame retardant decomposes at a relatively high temperature higher than 400 DEG C, so that when the nitrogenated flame retardant and the inorganic hydroxide flame retardant coexist, the decomposition temperature ranges are complementary, and the synergistic effect is realized. Therefore, the safety performance of the battery can be improved.

Description

technical field [0001] The present application relates to the technical field of batteries, in particular to a battery. Background technique [0002] Batteries have the advantages of high energy density and no memory effect, and are widely used in electronic equipment, electric vehicles and other fields. However, the safety performance of the battery is one of the main factors limiting its further application. In order to improve its safety performance, various safety schemes including safety coatings have been studied. The concept of safety coating refers to coating a layer of insulator on the surface of the positive electrode, negative electrode or separator of the battery, such as aluminum oxide, silicon oxide, zirconium oxide, silicon nitride, and aluminum hydroxide, magnesium hydroxide, etc. that have emerged in recent years. . The principle is to improve the mechanical properties of the pole sheet resistance or the isolation film, and the purpose is to improve the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/42H01M10/058
CPCH01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 刘阳宋晋阳李强艾邓均闫传苗
Owner CONTEMPORARY AMPEREX TECH CO