Lithium ion battery nanofiber graphene composite membrane and preparation method thereof

A graphene composite, lithium-ion battery technology, applied in battery pack parts, circuits, electrical components, etc., can solve the problems of low tensile strength of lithium-ion nanofiber separators, and achieve good wettability, high porosity, and high specific gravity. The effect of large surface area

Inactive Publication Date: 2017-02-22
CHINA ZHEJIANG GREAT SOUTHEAST GRP
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to overcome the defect of low tensile strength of the lithium ion nanofiber separator prepared by the existing electrospinning technology, the present invention provides a membrane with large specific surface area, high porosity, excellent liquid absorption rate, good wettability, and tensile strength. Lithium-ion battery nanofiber graphene composite diaphragm with high tensile strength and fully in line with the normal operation of lithium battery production equipment and its preparation method

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  • Lithium ion battery nanofiber graphene composite membrane and preparation method thereof

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preparation example Construction

[0039] A preparation method of nanofiber graphene composite diaphragm for lithium ion battery, comprising the following steps:

[0040] 1) The manufacturing process of the PVDF-based polymer nanofiber layer is:

[0041] 1.1) The mass ratio of the three component polymers is: PVDF65-85 parts, PVDF-HFD 10-25 parts, PAN 5-10 parts; the three component polymers are mixed according to the mass part ratio, and after stirring , to achieve good uniformity;

[0042] 1.2) The mass-number ratio of the three component solvents is: 15-30 parts of N.N dimethylformamide, 65-80 parts of dimethylacetamide, and 5-30 parts of acetone; Mix together and stir to form a transparent solution;

[0043] 1.3) Add the melted solvent into the three-component polymer mixture, after stirring, let it stand for 4-6 hours, then stir with a magnetic stirrer, first at a low speed of 0.5 hours, then at a medium speed of 5-6 hours , to stop between the viscosity of 600-750Pa.s;.

[0044] 1.4) Leave the configu...

Embodiment 1

[0055] In this embodiment, the proportions of the mass content of the upper layer, the middle layer and the lower layer to the total mass are respectively: the upper layer and the lower layer each account for 15%, and the middle layer accounts for 70%.

[0056] In the PVDF-based polymer nanofiber layer, the three-component polymer mass fraction ratio is: 65 parts of PVDF, 10 parts of PVDF-HFD, and 5 parts of PAN; the mass fraction ratio of the three component solvents is: N.N dimethyl 15 parts of methyl formamide, 65 parts of dimethylacetamide, and 5 parts of acetone.

[0057] Described PVDF-based graphene nanofiber layer comprises graphite powder, inorganic strong protonic acid (concentrated sulfuric acid, fuming nitric acid or mixture), potassium permanganate and sodium nitrate mixture, hydrogen peroxide, coupling agent titanate, hydrazine hydrate, Sodium polystyrene sulfonate (PSS), the mass ratio of 7 components is: graphite powder 40 parts, inorganic acid protonic acid (c...

Embodiment 2

[0060] In this embodiment, the mass content of the upper layer and the lower layer accounts for 16% of the total mass, and the mass content of the middle layer accounts for 68% of the total mass.

[0061] In the PVDF-based polymer nanofiber layer, the mass fraction ratio of the three component polymers is: 67 parts of PVDF, 11.5 parts of PVDF-HFP, and 5.5 parts of PAN; the mass fraction ratio of the three component solvents is: N.N - 17 parts of dimethylamide, 67 parts of dimethylacetamide, 8 parts of acetone.

[0062] Described PVDF-based graphene nanofiber layer comprises graphite powder, inorganic strong protonic acid (concentrated sulfuric acid, fuming nitric acid or mixture), potassium permanganate and sodium nitrate mixture, hydrogen peroxide, coupling agent titanate, hydrazine hydrate, Sodium polystyrene sulfonate (PSS), the mass ratio of 7 components is: graphite powder 42 parts, inorganic acid protonic acid (concentrated sulfuric acid, fuming nitric acid or mixture) 2...

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Abstract

Disclosed is a lithium ion battery nanofiber graphene composite membrane. The composite membrane comprises an upper layer, a middle layer and a lower layer. The upper layer and the lower layer are PVDF based polymer nanofiber layers, the middle layer is a PVDF base graphene nanofiber layer, the lower layer is covered with the middle layer, and the middle layer is covered with the upper layer. The invention further provides a preparation method of the lithium ion battery nanofiber graphene composite membrane. The lithium ion battery nanofiber graphene composite membrane and the preparation method thereof have the advantages that the existing specific surface area porosity is high, the electrolyte uptake rate is excellent, the wettability is good, the tensile strength is large, and normal operation of lithium battery production equipment is completely achieved.

Description

technical field [0001] The invention relates to a lithium-ion battery diaphragm, in particular to a lithium-ion battery nanofiber graphene composite diaphragm and a preparation method thereof. Background technique [0002] The role of the diaphragm of a lithium-ion battery (referred to as a lithium battery) is to separate the positive and negative electrodes of the battery. , Maintain the normal energy exchange of the battery and prevent the short circuit of the battery, which is indispensable. [0003] At present, most of the separators used in lithium batteries are polyolefin polymer films produced by biaxial stretching. The materials are mainly polyethylene (PE) and polypropylene (PP). and wet method. There are also organic or inorganic substances coated on the diaphragm. The above diaphragms all have disadvantages, mainly because the diaphragm has low porosity, only about 40%, low electrolyte adsorption, less than 150%, wide porosity distribution, and poor safety. Re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16H01M2/14H01M50/403H01M50/426H01M50/44
CPCH01M50/403H01M50/449Y02E60/10
Inventor 黄水寿郭加义
Owner CHINA ZHEJIANG GREAT SOUTHEAST GRP
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