Composite lithium battery diaphragm and preparation method thereof

A battery diaphragm and lithium composite technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of poor temperature resistance and low porosity of lithium battery diaphragms

Active Publication Date: 2013-07-24
SINOMA LITHIUM BATTERY SEPARATOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor temperature resistance and low porosity of lithium battery separators in the prior art, and provide a composite lithium battery separator with high porosity, good safety, good high temperature resistance, and mechanical strength. Good, and can charge and discharge quickly, can be used for automotive power lithium batteries

Method used

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  • Composite lithium battery diaphragm and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the composite lithium battery separator of this embodiment is composed of the upper nanofiber membrane 1 , the middle microfiber membrane 2 and the lower nanofiber membrane 3 . The fiber diameter of the upper nanofiber membrane 1 and the lower nanofiber membrane 3 is 100nm, the fiber diameter of the middle microfiber membrane is 2.5μm, and the total thickness of the composite lithium battery separator is 15μm.

[0028] Preparation:

[0029] Polyimide is used as the polymer material of the upper nanofiber membrane and the lower nanofiber membrane, and styrene-maleic anhydride copolymer is used as the polymer material of the middle microfiber membrane, and by solution electrospinning, Prepare the upper nanofiber membrane, the middle microfiber membrane and the lower nanofiber membrane respectively, and then unwind and stack them in sequence, and then place them in a curing furnace at 150°C to remove the solvent, and finally control the pressure...

Embodiment 2

[0036] The composite lithium battery separator of this embodiment is composed of an upper nanofiber membrane, a middle microfiber membrane and a lower nanofiber membrane. The fiber diameters of the upper nanofiber membrane and the lower nanofiber membrane are 120nm, the fiber diameter of the middle microfiber membrane is 2.9μm, and the total thickness of the composite lithium battery separator is 25μm.

[0037] Preparation:

[0038]Polyvinylidene fluoride is used as the polymer material of the upper nanofiber membrane and the lower nanofiber membrane, polyvinyl alcohol is used as the polymer material of the middle microfiber membrane, and the upper nanofiber membrane is prepared by solution electrospinning. The fiber membrane, the middle layer of microfiber membrane and the lower layer of nanofiber membrane are then unrolled and stacked in sequence, and then placed in a curing furnace at 240°C to remove the solvent, and finally roll-formed at 210°C by temperature-controlled pr...

Embodiment 3

[0045] The composite lithium battery separator of this embodiment is composed of an upper nanofiber membrane, a middle microfiber membrane and a lower nanofiber membrane. The fiber diameter of the upper nanofiber membrane and the lower nanofiber membrane is 138nm, the fiber diameter of the middle microfiber membrane is 3.4μm, and the total thickness of the composite lithium battery separator is 40μm.

[0046] Preparation:

[0047] Polyarylene sulfide sulfone is used as the polymer material of the upper nanofiber membrane and the lower nanofiber membrane, polyurethane is used as the polymer material of the middle microfiber membrane, and the upper nanofibers are respectively prepared by solution electrospinning The membrane, the middle layer of microfiber membrane and the lower layer of nanofiber membrane are then unrolled and stacked in sequence, and then placed in a curing furnace at 200°C to remove the solvent, and finally roll-formed at 180°C by temperature-controlled press...

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Abstract

The invention relates to a composite lithium battery diaphragm which is formed by compounding an upper nanometer fiber membrane, a middle micrometer fiber membrane and a lower nanometer fiber membrane, wherein the fiber diameters of the upper nanometer fiber membrane and the lower nanometer fiber membrane are 1-200 nanometers, and the fiber diameter of the middle micrometer fiber membrane is 1-10 micrometers. The preparation method comprises the steps of respectively preparing the upper nanometer fiber membrane, the middle micrometer fiber membrane and the lower nanometer fiber membrane through a solution electrostatic spinning method by using the polymeric materials of the upper nanometer fiber membrane, the middle micrometer fiber membrane and the lower nanometer fiber membrane; then sequentially releasing and winding laminated layers; then placing into a curing furnace, and heating to remove a solvent; and finally carrying out roll forming on a press roll by controlling temperature. The composite lithium battery diaphragm disclosed by the invention has the advantages of high poriness, good safety, good high-temperature resistance, good mechanical strength and fast charge-discharge and can be used for automobile power lithium batteries.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm and a preparation method thereof, in particular to a manufacturing technology and a product of a composite lithium battery diaphragm. Background technique [0002] Lithium-ion battery separators are divided into manufacturing technologies. At present, there are mainly uniaxial stretching process and biaxial stretching process, as well as wet synchronous stretching and dry stretching. No matter what production process is used, the raw materials used for lithium battery separators are mostly Polyethylene, polypropylene, and PVDF lithium battery diaphragm manufacturing technology have also been reported recently, using the casting method or scrape coating method, without stretching to form a film. For single-layer film PE and PP, their temperature resistance is not good, the porosity is relatively low (30-40%), and the safety is poor; while the three-layer composite film PP / PE / PP has better safety (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/18
CPCY02E60/10
Inventor 赵东波黄箭玲范凌云费传军董浩宇周群张莎郭晓蓓朱平宋尚军白耀宗
Owner SINOMA LITHIUM BATTERY SEPARATOR CO LTD
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