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Three-layer composite functionalized CPP film for power lithium battery soft coating film and preparation method thereof

A functional and layer-combined technology, applied in the field of composite membranes, can solve the problems of CPP’s electrolyte resistance, aluminum foil delamination and shedding, which are difficult to balance, and achieve the effect of solving the delamination and shedding problem and improving performance

Pending Publication Date: 2020-09-11
新纶新能源材料(常州)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to balance the CPP electrolyte resistance and aluminum foil delamination of the existing power lithium battery soft coating

Method used

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  • Three-layer composite functionalized CPP film for power lithium battery soft coating film and preparation method thereof

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Effect test

preparation example Construction

[0029] Two, a kind of preparation method of the three-layer composite functionalized CPP film that is used for power lithium battery soft coating, comprises steps:

[0030] (1) Graft modified polypropylene particles are added to the first hopper of the extruder, and then enter the first passage of the die head;

[0031] (2) Put polypropylene granules into the first mixing tank, add nanomaterials into the first mixing tank, and fully stir under the conditions of the rotation speed of 100r / min to 300r / min and the temperature of 20°C to 35°C to obtain The middle layer material, the middle layer material is added to the second hopper of the extruder, and then enters the second channel of the die head;

[0032] (3) Put the polypropylene particles into the second mixing tank, add the nucleating agent into the second mixing tank, and stir thoroughly under the conditions of the rotating speed of 100r / min~300r / min and the temperature of 20℃~35℃ Obtain the inner layer material, add the...

Embodiment 1

[0049] (1) Maleic anhydride grafted modified polypropylene particles are added in the first hopper of the extruder, and then enter the first passage of the die head;

[0050] (2) Polypropylene particles are put into the first mixing tank, and nano-flaky zinc oxide is added in the first mixing tank, the mass ratio of nano-flaky zinc oxide to polypropylene particles is 0.1%, and the rotating speed is 100r / minr / min, the temperature is 20 ° C under the condition of sufficient stirring to obtain the middle layer material, the middle layer material is added to the second hopper of the extruder, and then enters the second channel of the die head;

[0051] (3) Put the polypropylene particles into the second mixing tank, add a nucleating agent to the second mixing tank, the nucleating agent is a rosin-type nucleating agent, under the conditions of a rotating speed of 100r / min and a temperature of 20°C After fully stirring to obtain the inner layer material, add the inner layer materia...

Embodiment 2

[0060] (1) Maleic anhydride grafted modified polypropylene particles are added in the first hopper of the extruder, and then enter the first passage of the die head;

[0061] (2) Polypropylene particles are put into the first mixing tank, and nano-flaky zinc oxide is added in the first mixing tank, the mass ratio of nano-flaky zinc oxide to polypropylene particles is 1.5%, and the rotating speed is 200r / min , the temperature is 28 ° C under the condition of sufficient stirring to obtain the middle layer material, the middle layer material is added to the second hopper of the extruder, and then enters the second channel of the die head;

[0062] (3) Put the polypropylene granules into the second mixing tank, add a nucleating agent to the second mixing tank, the nucleating agent is a polymer nucleating agent, under the condition that the rotating speed is 200r / min and the temperature is 28°C After fully stirring to obtain the inner layer material, add the inner layer material to...

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Abstract

The invention provides a three-layer composite functionalized CPP film for a power lithium battery soft coating film, and a preparation method thereof, and a preparation method of the power lithium battery soft coating film. The performances of heat sealing, electrolyte resistance and the like are improved, and the heat sealing strength reaches 140.8 N / 15mm; after the CPP is soaked in the electrolyte, the stripping force of the heat sealing layer and the aluminum foil reaches 17.1 N / 15mm, the heat sealing strength reaches 53N / 15mm, and the problem that the CPP resists the electrolyte and fallsoff from the aluminum foil in a layered mode is solved.

Description

technical field [0001] The invention belongs to the technical field of composite membranes, and in particular relates to a method for preparing a three-layer composite functionalized CPP membrane used for a power lithium battery soft coating. Background technique [0002] With the development requirements of mobile or small and medium-sized energy storage devices, especially the application development requirements for power lithium batteries in various shapes and states, the technical route of soft-pack lithium-ion batteries has emerged as the times require. The soft-pack lithium-ion battery is a kind of external package that uses strong plasticity and a certain degree of flexibility to package the current collector, separator and electrolyte. At this stage, the aluminum-plastic composite film used for the packaging of soft-pack lithium-ion batteries can generally meet the packaging requirements of lithium-ion batteries. The main structure of aluminum-plastic film for lith...

Claims

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Application Information

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IPC IPC(8): H01M2/02B32B27/32B32B27/18B32B15/20B32B15/085B32B7/12B32B27/08B32B27/06B32B33/00H01M10/0525
CPCB32B7/12B32B15/085B32B15/20B32B27/08B32B27/18B32B27/32B32B33/00B32B2307/31H01M10/0525Y02E60/10
Inventor 田佳乐王新龙
Owner 新纶新能源材料(常州)有限公司
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