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Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof

A lithium battery separator, high-porosity technology, applied in lithium batteries, battery pack parts, non-aqueous electrolyte batteries, etc., can solve the problem of unfavorable electrolyte penetration of ions, reduced battery electrochemical performance, and poor electrolyte affinity. and other problems, to achieve the effect of improving hydrophilicity, facilitating penetration and ion passage, and enhancing liquid absorption

Active Publication Date: 2021-08-31
JIANGSU HORIZON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional polyolefin battery separator has low porosity, poor affinity for electrolyte, and low liquid absorption of the separator. For example, the common range of PE separator porosity is between 38-47%, and the average pore diameter is about 30-45nm. The surface of the current commercial polyolefin lithium battery separator is relatively dense, which is not conducive to the penetration of the electrolyte and the passage of ions, which reduces the electrochemical performance of the battery; the current production process of the polyolefin separator phase separation, the cloud point temperature is low, and the dispersion The droplets formed by the phase are relatively small, which is an important reason for the small pore size of the diaphragm

Method used

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  • Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof
  • Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof
  • Honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mix 30kg of high-density polyethylene, methyl cellulose, and dioctyl phthalate evenly, move to the heating unit of the twin-screw extruder, heat to form a homogeneous phase, the heating temperature is 175°C, and keep warm for 2h, Turn on the gear pump, and the homogeneous material is extruded through the die to form a cast diaphragm.

[0029] (2) Immerse the cast separator in ethanol solution to extract dioctyl phthalate, take out the cast separator after the extraction, and wait until the ethanol is completely volatilized to obtain a honeycomb high-porosity and large-aperture lithium battery separator.

[0030] The distribution ratio of the various components of the raw materials for preparing the lithium battery separator is, in terms of mass fraction, 30 parts of high-density polyethylene, 1 part of methyl cellulose, and 70 parts of dioctyl phthalate.

Embodiment 2

[0032] (1) Mix 30kg of high-density polyethylene, methyl cellulose, and dioctyl phthalate evenly, move to the heating unit of the twin-screw extruder, heat to form a homogeneous phase, the heating temperature is 175°C, and keep warm for 2h, Turn on the gear pump, and the homogeneous material is extruded through the die to form a cast diaphragm.

[0033] (2) Immerse the cast separator in ethanol solution to extract dioctyl phthalate, take out the cast separator after the extraction, and wait until the ethanol is completely volatilized to obtain a honeycomb high-porosity and large-aperture lithium battery separator.

[0034] The distribution ratio of the various components of the raw materials for preparing the lithium battery separator is, in terms of mass fraction, 30 parts of high-density polyethylene, 2 parts of methyl cellulose, and 70 parts of dioctyl phthalate.

Embodiment 3

[0036] (1) Mix 30kg of high-density polyethylene, methyl cellulose, and dioctyl phthalate evenly, move to the heating unit of the twin-screw extruder, heat to form a homogeneous phase, the heating temperature is 175°C, and keep warm for 2h, Turn on the gear pump, and the homogeneous material is extruded through the die to form a cast diaphragm.

[0037] (2) Immerse the cast separator in ethanol solution to extract dioctyl phthalate, take out the cast separator after the extraction, and wait until the ethanol is completely volatilized to obtain a honeycomb high-porosity and large-aperture lithium battery separator.

[0038] The distribution ratio of each component of the raw materials for preparing the lithium battery separator is, in terms of mass fraction, 30 parts of high-density polyethylene, 5 parts of methyl cellulose, and 70 parts of dioctyl phthalate.

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Abstract

The invention discloses a honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing polyolefin, methyl cellulose and dioctyl phthalate, transferring to a heating unit of a double-screw extruder, heating to form a homogeneous phase, and extruding through a die head to form a cast sheet diaphragm; and immersing the cast sheet diaphragm into an extracting agent to extract the dioctyl phthalate, so as to prepare the honeycomb-shaped high-porosity and large-aperture lithium battery diaphragm. The surface of the lithium battery diaphragm is subjected to hydrophilic anti-aging treatment, specifically, the surface of the lithium battery diaphragm is coated with polydopamine for modification, then the modified lithium battery diaphragm and nanoscale graphene oxide are subjected to an acylation reaction under catalysis of diisopropyl carbodiimide, the surface of the lithium battery diaphragm is coated with a layer of graphene oxide, then amination treatment is conducted through adipic acid dihydrazide, so the surface hydrophilicity of the lithium battery diaphragm is enhanced. The lithium battery diaphragm prepared by the invention is high in porosity, large in aperture, excellent in compatibility with electrolyte, high in liquid absorption rate and strong in hydrophilicity.

Description

technical field [0001] The invention relates to the technical field of battery separators, in particular to a honeycomb high-porosity and large-aperture lithium battery separator and a preparation method thereof. Background technique [0002] As an important part of lithium batteries, the performance of lithium battery separators is related to the quality and performance of lithium batteries. Polyolefin materials are widely used in the field of lithium batteries due to their good chemical stability and mechanical properties. The traditional polyolefin battery separator has low porosity, poor affinity for electrolyte, and low liquid absorption of the separator. For example, the common range of PE separator porosity is between 38-47%, and the average pore diameter is about 30-45nm. The surface of the current commercial polyolefin lithium battery separator is relatively dense, which is not conducive to the penetration of the electrolyte and the passage of ions, which reduces th...

Claims

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Application Information

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IPC IPC(8): H01M50/403H01M50/414H01M50/489H01M50/491H01M10/052H01M6/14
CPCH01M50/403H01M50/414H01M50/489H01M50/491H01M10/052H01M6/14Y02E60/10
Inventor 刘科尚文滨陈朝晖
Owner JIANGSU HORIZON NEW ENERGY TECH CO LTD
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