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Positive temperature coefficient (PTC) safe coating as well as preparation method and application thereof

A coating and safe technology, applied in the field of lithium-ion batteries, can solve the problems of easy redistribution of conductive agents, low PTC strength, NTC effect, etc., and achieve the effect of eliminating NTC effect, high PTC strength and increasing internal resistance

Inactive Publication Date: 2019-03-01
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature rises, the high molecular polymer expands, the conductive agent is easily redistributed, the conductive agent network is not easily destroyed, and the internal resistance does not rise significantly, resulting in low PTC strength and even NTC effect.

Method used

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  • Positive temperature coefficient (PTC) safe coating as well as preparation method and application thereof
  • Positive temperature coefficient (PTC) safe coating as well as preparation method and application thereof
  • Positive temperature coefficient (PTC) safe coating as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] In the present embodiment, the preparation method of the lithium-ion battery containing PTC coating comprises the following steps:

[0037] 1. Preparation of polymer modified conductive filler: at room temperature, after dissolving polymer polycarboxyphenylene vinylene and conductive carbon black with a mass ratio of 3:1 in NMP, and adding 20% ​​of the total mass of polymer modified conductive filler 0.02% formic acid was mixed in a torque rheometer for 2 hours to prepare a polymer modified conductive filler slurry with a viscosity of 5% and a viscosity of 800 mpa•s.

[0038] 2. Preparation of PTC safety coating:

[0039](1) Preparation of PTC slurry: Add the polymer modified conductive filler slurry, polymer, and inorganic filler aluminum oxide into the stirring tank, and control the polymer modified conductive filler, polymer, inorganic The mass ratio of the filler aluminum oxide is 75:21:4, and then a certain amount of NMP is added, and after stirring for 3 hours at...

Embodiment 2

[0049] In the present embodiment, the preparation method of the lithium-ion battery containing PTC coating comprises the following steps:

[0050] 1. Preparation of polymer modified conductive filler: at room temperature, after dissolving polymer polycarboxyphenylene vinylene and conductive carbon black with a mass ratio of 3:1 in NMP, and adding 20% ​​of the total mass of polymer modified conductive filler 0.02% formic acid. The polymer modified conductive filler slurry with a solid content of 5% and a viscosity of 800 mpa·s was prepared by mixing in a torque rheometer for 2 hours.

[0051] 2. Preparation of PTC safety coating:

[0052] (1) Preparation of PTC slurry: Add the polymer modified conductive filler slurry, polymer, and inorganic filler aluminum oxide into the stirring tank, and control the polymer modified conductive filler, polymer, inorganic The mass ratio of the filler aluminum oxide is 75:21:4, and then a certain amount of NMP is added, the revolution is 30RP...

Embodiment 3

[0060] In the present embodiment, the preparation method of the lithium-ion battery containing PTC coating comprises the following steps:

[0061] 1. Preparation of polymer modified conductive filler: at room temperature, after dissolving polymer polycarboxyphenylene vinylene and conductive carbon black with a mass ratio of 3:1 in NMP, and adding 20% ​​of the total mass of polymer modified conductive filler 0.02% formic acid was mixed in a torque rheometer for 2 hours to prepare a polymer modified conductive filler slurry with a solid content of 5% and a viscosity of 800 mpa•s.

[0062] 2. Preparation of PTC safety coating:

[0063] (1) Preparation of PTC slurry: Add the polymer modified conductive filler slurry, polymer, and inorganic filler aluminum oxide into the stirring tank, and control the polymer modified conductive filler, polymer, inorganic The mass ratio of the filler aluminum oxide is 75:21:4, and then a certain amount of NMP is added, the revolution is 30RPM, the...

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Abstract

The invention discloses a positive temperature coefficient (PTC) safe coating as well as a preparation method and application thereof. The PTC safe coating is prepared from polymer modified conductivefiller, a high molecular polymer, and inorganic filler. The preparation method comprises the following concrete steps: (1) dispersing the polymer modified conductive filler in an organic solvent to obtain polymer modified conductive filler slurry; (2) adding the high molecular polymer into the polymer modified conductive filler slurry and mixing uniformly, and then adding the inorganic filler toprepare PTC slurry; (3) evenly coating the surface of aluminum foil or copper foil with the PTC slurry by using a gravure printing or spraying process, drying by heating, and removing the solvent; (4)putting the surface, coated with PTC, of the aluminum foil or the copper foil in an oven, and baking under the protection of an inert gas to obtain the PTC coating. When being applied to a lithium ion battery, the PTC safe coating can improve the dispersibility of conductive carbon, enhance the PTC strength and eliminate a negative temperature coefficient (NTC) effect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a novel PTC safety coating, a preparation method thereof and a lithium ion battery using the PTC safety coating. Background technique [0002] In recent years, with the development of clean and alternative energy sources, and the unique advantages of lithium-ion batteries such as high specific energy, long cycle life, high energy conversion efficiency, and no memory effect, the application of lithium-ion batteries in electric vehicles and energy storage has been greatly promoted. However, its safety performance also seriously restricts the application of large-capacity and high-power lithium-ion batteries. [0003] At present, lithium-ion batteries are composed of lithium-containing positive electrode materials, graphite-type negative electrode materials, low melting and boiling point and flammable organic electrolytes, and separators. During the use of the battery, ...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525H01M10/42
CPCH01M4/624H01M4/625H01M10/0525H01M10/4235Y02E60/10
Inventor 彭建文李素丽李俊义徐延铭唐伟超
Owner ZHUHAI COSMX BATTERY CO LTD