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A kind of insulating gasket and its preparation method and lithium battery

A technology of insulating gaskets and macroporous materials, applied in the field of energy storage, can solve problems such as uneven infiltration, achieve good cycle consistency, long service life, and increase the effect of liquid storage space

Active Publication Date: 2020-11-24
EVE ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulating gasket provided by the invention can improve the uneven infiltration inside the battery liquid injection core, and at the same time increase the effective electrolyte storage space inside the battery, greatly improve the cycle performance of the battery, and prolong the service life of the battery

Method used

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  • A kind of insulating gasket and its preparation method and lithium battery
  • A kind of insulating gasket and its preparation method and lithium battery
  • A kind of insulating gasket and its preparation method and lithium battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The present embodiment adopts the following method to prepare insulating pads:

[0061] (1) Mix ethyl orthosilicate, poly-N-vinylpyridine, polystyrene-b-polyacrylic acid and ammonia water in water, heat and react at 60°C for 2h, centrifuge after reaction, and heat the obtained solid at 580°C The sintering is carried out at a temperature of 6 hours to obtain porous silica.

[0062] (2) Polyethylene terephthalate (PET) with a mass ratio of 3.7:6.3 and the porous silica described in step (1) are melt-mixed at 200° C., the time of melt-mixing is 110 min, and the melt-mixing It is accompanied by stirring, and after the mixing is completed, it is extruded under a pressure of 20MPa, and the extruded product is cut, and the pole hole and / or the lower liquid hole are made by die-cutting to obtain the insulation gasket.

[0063] The insulating gasket obtained in this embodiment is composed of a polyethylene terephthalate base material and porous silica dispersed in the base mat...

Embodiment 2

[0068] The present embodiment adopts the following method to prepare insulating pads:

[0069] (1) Mix ethyl orthosilicate, poly-N-vinylpyridine, polystyrene-b-polyacrylic acid and ammonia water in water, heat and react at 50°C for 3 hours, and separate solid and liquid after the reaction. The sintering is carried out at ℃, and the sintering time is 7 hours to obtain porous silica.

[0070] (2) The polyethylene terephthalate with a mass ratio of 3:6.3 and the porous silica described in step (1) were melt-mixed at 160° C., and the time of melt-mixing was 40 minutes. There is stirring, and after the mixing is completed, it is extruded under a pressure of 10 MPa, and the extruded product is cut, and the ear hole and / or the lower liquid hole are made by die cutting to obtain the insulating gasket.

[0071] The insulating gasket obtained in this embodiment is composed of a polyethylene terephthalate base material and porous silica dispersed in the base material, and the polyethyle...

Embodiment 3

[0074] The present embodiment adopts the following method to prepare insulating pads:

[0075] (1) Mix ethyl orthosilicate, poly-N-vinylpyridine, polystyrene-b-polyacrylic acid and ammonia water in water, heat and react at 70°C for 1.5h, and separate the solid and liquid after the reaction. Carry out sintering at 600° C. for 5 hours to obtain porous silicon dioxide.

[0076] (2) Melt and mix polypropylene (PP) with a mass ratio of 5:6.3 and the porous silica described in step (1) at 265°C, the time for melt mixing is 180min, while stirring and mixing After completion, it is extruded under a pressure of 35 MPa, and the extruded product is cut, and the tab hole and / or the lower liquid hole are manufactured by a die cutting method to obtain the insulating gasket.

[0077] The insulating gasket obtained in this embodiment is composed of polypropylene base material and porous silica dispersed in the base material, the mass ratio of polypropylene base material to porous silica is 5...

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Abstract

The invention provides an insulating gasket, a preparation method thereof and a lithium battery. The insulating pad is mainly composed of base material and macroporous material dispersed in the base material. The preparation method includes: melting and mixing the base material and the macroporous material, and extruding to obtain the insulating gasket. The pores of the insulating gasket provided by the present invention can absorb and store the electrolyte. With the consumption of the electrolyte after the cell cycle, the electrolyte inside the insulating gasket continues to transfer to the electrode group of the cell, which can provide electrolyte for the cell. It is equivalent to increasing the liquid storage space of the battery cell; the insulating gasket provided by the invention can permeate the electrolyte both horizontally and vertically, which greatly improves the penetration effect of the electrolyte and improves the uniformity of the electrolyte absorption of the battery cell. The cycle performance of the lithium battery using this insulating gasket is greatly improved, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of energy storage, and relates to a battery component, in particular to an insulating gasket, a preparation method thereof, and a lithium battery. Background technique [0002] Batteries are a widely used energy storage device, among which lithium batteries are particularly attractive. Lithium battery is a type of battery that uses lithium metal or lithium alloy as the negative electrode material and uses a non-aqueous electrolyte solution. In 1912, the lithium metal battery was first proposed and studied by GilbertN.Lewis. In the 1970s, M.S.Whittingham proposed and began to study lithium-ion batteries. Due to the very active chemical properties of lithium metal, the processing, storage and use of lithium metal have very high environmental requirements. Therefore, lithium batteries have not been used for a long time. With the development of science and technology, lithium batteries have become the mainst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M10/0587
CPCH01M10/052H01M10/0587Y02E60/10Y02P70/50
Inventor 舒宽金何巍徐悦斌祝媛刘金成
Owner EVE ENERGY CO LTD