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Battery separator and preparation method therefor

A diaphragm and battery technology, applied in the field of battery diaphragm and its preparation, can solve the problems of low curling, small increase in airtightness, mechanical properties of the diaphragm need to be improved, etc., to achieve improved mechanical properties, optimized mechanical properties, and good mechanical properties. performance effect

Inactive Publication Date: 2016-12-21
YANGZHOU YUE HENG MECHANICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention patent with the application number 201380003088.6 discloses a separator for batteries and a method for preparing the separator for batteries. The porous membrane A containing polyethylene resin is laminated with heat-resistant resin and inorganic particles or cross-linked polymer particles. The battery separator of the porous membrane B provides a battery separator that has low curling properties and simultaneously achieves excellent adhesion of the heat-resistant resin layer and a small increase in air resistance, and provides a battery separator suitable for high capacity, A battery separator with excellent ion permeability and high-speed processability in the battery assembly process, especially a battery separator suitable for lithium-ion secondary battery separators, but the mechanical properties of the separator need to be improved

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0020] The battery separator of this embodiment includes a base material layer and a modified layer coated on the base material layer. Wherein, the substrate layer is a polyolefin film, polyethylene film or polypropylene film can be selected; the modified layer includes the following components by weight: 2,6-di-tert-butyl-4-methylphenol 20 15 parts of alkane-based paraffin oil, 10 parts of antioxidant, 5 parts of surfactant and 3 parts of adhesive.

[0021] Among them, the antioxidant is selected from triphenyl phosphite, tris (mononylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tris (2,4-bis - One or more of tert-butyl-5-methylphenyl) phosphite, the surfactant is a nonionic surfactant, and the binder is hypromellose, dextrin, polyethylene glycol and one or more of the syrups.

[0022] The preparation method of the battery diaphragm comprises the following steps:

[0023] S1. Mix 2,6-di-tert-butyl-4-methylphenol, alkane-based paraffin oil, antioxidant, surf...

Embodiment 2

[0027] The battery separator of this embodiment includes a base material layer and a modified layer coated on the base material layer. Wherein, the substrate layer is a polyolefin film, polyethylene film or polypropylene film can be selected; the modified layer includes the following components in parts by weight: 2,6-di-tert-butyl-4-methylphenol 30 18 parts of alkane-based paraffin oil, 15 parts of antioxidant, 8 parts of surfactant and 5 parts of adhesive.

[0028] The preparation method of the battery diaphragm comprises the following steps:

[0029] S1. Mix 2,6-di-tert-butyl-4-methylphenol, alkane-based paraffin oil, antioxidant, surfactant and adhesive at high speed (1200-1500rpm) in parts by weight and mix evenly. The material is sent into the internal mixer, and the temperature is raised to 80-100°C for internal mixing for 20-40 minutes to obtain the modified layer mixture;

[0030] S2, polishing and cleaning the substrate layer;

[0031] S3. Spin-coat the mixture of...

Embodiment 3

[0033] The battery separator of this embodiment includes a base material layer and a modified layer coated on the base material layer. Wherein, the substrate layer is a polyolefin film, polyethylene film or polypropylene film can be selected; the modified layer includes the following components in parts by weight: 2,6-di-tert-butyl-4-methylphenol 40 20 parts, 20 parts of alkane-based paraffin oil, 20 parts of antioxidant, 10 parts of surfactant and 8 parts of adhesive.

[0034] The preparation method of the battery diaphragm comprises the following steps:

[0035] S1. Mix 2,6-di-tert-butyl-4-methylphenol, alkane-based paraffin oil, antioxidant, surfactant and adhesive at high speed (1200-1500rpm) in parts by weight and mix evenly. The material is sent into the internal mixer, and the temperature is raised to 80-100°C for internal mixing for 20-40 minutes to obtain the modified layer mixture;

[0036] S2, polishing and cleaning the substrate layer;

[0037] S3. Spin-coat the...

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Abstract

The invention discloses a battery separator and a preparation method therefor. The battery separator comprises a base material layer and a modified layer which is coated on the base material layer, wherein the base material layer is a polyolefin thin film; and the modified layer comprises the following components in parts by weight: 20-40 parts 2, 6-ditert-butyl-4-methylphenol, 15-20 parts of alkane paraffin oil, 10-20 parts of antioxidant, 5-10 parts of surface active agent and 3-8 parts of binder. The battery separator is high in mechanical performance, and the transverse strain rate and the longitudinal strain rate of the separator are both less than 1%, so that requirements of the high-end battery market can be well satisfied; it is verified that the mechanical performance of the separator can be obviously improved by the alkane paraffin oil in the modified layer; and in addition, the mechanical performance can be further optimized by banburying processing to the modified layer.

Description

technical field [0001] The invention relates to a separator for batteries and a preparation method thereof, belonging to the technical field of battery manufacture. Background technique [0002] The battery separator refers to a layer of diaphragm material between the positive and negative electrodes of the battery. It is a very critical part of the battery and has a direct impact on battery safety and cost. Its main function is to isolate the positive and negative electrodes and The electrons in the battery cannot pass freely, and the ions in the electrolyte can pass freely between the positive and negative electrodes. The ion conductivity of the battery separator is directly related to the overall performance of the battery. Its function of isolating the positive and negative electrodes can limit the increase in current when the battery is overcharged or the temperature rises, preventing the battery from short-circuiting and causing an explosion. It has the function of cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16
CPCH01M50/40H01M50/411Y02E60/10
Inventor 孔来发王定安
Owner YANGZHOU YUE HENG MECHANICAL TECH CO LTD
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