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Thin film, preparation method thereof and battery

A thin-film and dry-process technology, applied in secondary batteries, battery components, circuits, etc., can solve problems affecting battery performance, poor adhesion, coating peeling, etc., to improve lyophilicity and reduce crystallinity , The effect of improving battery performance

Pending Publication Date: 2022-03-15
SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the lyophilic and liquid-retaining properties of the separator, there are many studies on the modification of the separator coating, but the coating has the problem of poor adhesion between the coating and the base film, and the coating has the risk of peeling off, which ultimately affects the performance of the battery. performance

Method used

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  • Thin film, preparation method thereof and battery
  • Thin film, preparation method thereof and battery
  • Thin film, preparation method thereof and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] In this embodiment, the raw material used to prepare the middle layer of the film is polypropylene with a weight average molecular weight of 500,000 and a melt index of 0.5 g / 10 min.

[0064] The raw materials used to prepare the surface layer of the film are polypropylene and maleic anhydride. By mass, polypropylene:maleic anhydride=60:40, the weight average molecular weight of polypropylene is 400,000, and the melt index is 1.2g / 10min.

[0065] The thin film preparation method of embodiment 1~7 is as follows:

[0066] 1. Casting: Feed thermoplastic resin particles and modified substances into a single-screw extruder (one extruder, two melting and plasticizing runners for melting the surface layer raw materials and the middle layer raw materials respectively) through the feeding system, Melt extrusion, the extrusion temperature is 140-280°C, after the melt passes through the primary filter and the secondary filter, it passes through the three-layer splitter, enters the...

Embodiment 2～7

[0074] Examples 2-7 were carried out with reference to Example 1. The differences are shown in Table 1 and Table 2. The differences include the different thicknesses of the prepared separators. The specific thicknesses are shown in Table 2. The specific process parameters of each embodiment are shown in Table 1.

[0075] Table 1

[0076]

[0077]

[0078] The basic physical and chemical performance indicators of the high-performance multilayer lithium-ion battery separators of Examples 1-7 are shown in Table 2.

[0079] Table 2

[0080]

[0081] The thickness test method is carried out according to "GB / T 6672-2001 Mechanical Measurement Method for Thickness Determination of Plastic Films and Sheets". It is measured by a Marr thickness gauge with a flat contact head. Before the measurement, the instrument is calibrated and cleared, and the contact surface is kept clean. The TD direction of the film is measured at intervals of 5 cm, and the average value of the 5 point...

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Abstract

The invention relates to a thin film, a preparation method thereof and a battery. The thin film comprises the following components: thermoplastic resin and a lyophilic modifier. The thermoplastic resin is modified by adding the lyophilic modifier, so that the lyophilic property of the film is remarkably improved, the crystallinity is reduced, the lyophilic and liquid-retaining properties of the modified film are excellent, and the improvement of the battery performance is facilitated.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a thin film, a preparation method thereof and a battery. Background technique [0002] The separator is an important part of the lithium-ion battery. Its function is to isolate the positive and negative electrodes, prevent the short circuit of the positive and negative electrodes, and at the same time have the function of ion conduction, so that the electrochemical reaction can proceed smoothly. The separator has an important influence on the cycle performance, rate performance and safety performance of the battery. In order to improve the lyophilic and liquid-retaining properties of the separator, there are many studies on the modification of the separator coating, but the coating has the problem of poor adhesion between the coating and the base film, and the coating has the risk of peeling off, which ultimately affects the performance of the battery. performance. Contents ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M10/0525H01M10/054H01M50/414H01M50/431H01M50/457
CPCH01M50/403H01M50/414H01M50/431H01M50/457H01M10/0525H01M10/054Y02E60/10
Inventor 张辉姚坤李昭
Owner SHENZHEN ZHONGXING NEW MATERIAL TECH CO LTD
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