Polymer-based positive temperature coefficient thermistor composite material and preparation method and application thereof

A technology of composite materials and polymers, applied in the direction of resistors with positive temperature coefficients, resistors, non-adjustable metal resistors, etc., can solve the problems of inability to respond to battery temperature changes in time, loss of function, etc.

Active Publication Date: 2021-05-21
ZHUHAI COSMX BATTERY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

In the field of electrochemical energy storage devices, the external PPTC protection device cannot respond to the temperature change inside the battery in time and loses its effect

Method used

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  • Polymer-based positive temperature coefficient thermistor composite material and preparation method and application thereof
  • Polymer-based positive temperature coefficient thermistor composite material and preparation method and application thereof
  • Polymer-based positive temperature coefficient thermistor composite material and preparation method and application thereof

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[0052] The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0053] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

Embodiment 1

[0055] Step 1. Add PVDF powder and methacrylate into nitrogen methylpyrrolidone (NMP), stir evenly, the stirring speed is 500r / min, and the stirring time is 8h. After stirring, let it stand for 72h to fully dissolve the PVDF. The mass ratio of the PVDF powder and NMP is 1:10. Methacrylate accounted for 10 wt% of the total mass of the polymer.

[0056] Step 2: Add the conductive agent Super-P to the prepared solution in Step 1, and ball mill for 30 minutes to prepare PPTC slurry. The mass ratio of the conductive agent Super-P and PVDF powder is 1:5.

[0057] Step 3: Coating the prepared PPTC slurry on both sides of the aluminum foil with a thickness of 10 μm to prepare a PPTC positive current collector, the thickness of the coating layer on one side is 2 μm. The negative electrode current collector is only copper foil.

[0058] Step 4, prepare lithium ion battery, the method is as follows:

[0059] (1) Negative electrode active material artificial graphite, conductive agent...

Embodiment 2

[0064] Others are the same as in Example 1, the only difference is that in step 1, methacrylate accounts for 30wt% of the total mass of the polymer.

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Abstract

The invention provides a polymer-based positive temperature coefficient thermistor composite material and a preparation method and application thereof. The polymer-based positive temperature coefficient thermistor composite material comprises a polymer matrix and a conductive agent, wherein the mass ratio of the polymer matrix to the conductive agent is 1: 40-1: 1. By adjusting the content of the monomer in the composite material, the initial action temperature of the PPTC safety electrode is regulated and controlled. The invention also provides a lithium ion battery based on the PPTC safety electrode, and the lithium ion battery can completely pass a safety test. According to the method disclosed by the invention, the initial action temperature of the PPTC material can be adjusted according to actual requirements, and exemplarily, the melting point temperature of PVDF is about 160 DEG C under general conditions, and according to the method disclosed by the invention, the initial action temperature of the PVDF-based PPTC material can be adjusted to 110-150 DEG C.

Description

technical field [0001] The invention belongs to the technical field of polymer positive temperature coefficient thermistor material (PPTC material, Polymer PositiveTemperature Coefficient Material), in particular to a polymer-based positive temperature coefficient thermistor composite material and its preparation method and application. Background technique [0002] PTC (Positive Temperature Coefficient, Positive Temperature Coefficient) material refers to a material whose resistance increases with the increase of temperature. Polymer positive temperature coefficient thermosensitive material (PPTC) refers to a class of PTC materials based on polymers. [0003] PPTC is often manufactured as a PTC device, used to protect over-current circuits or used in delay start, sensors, etc. In the field of electrochemical energy storage devices, the external PPTC protection device cannot respond to the temperature change inside the battery in time and loses its effect. Therefore, resea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02H01M4/66H01M10/0525H01M10/42
CPCH01C7/028H01M4/665H01M10/0525H01M10/4235Y02E60/10
Inventor 陈若凡陈伟平刘春洋李素丽李俊义徐延铭
Owner ZHUHAI COSMX BATTERY CO LTD
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