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Nanometer fiber lithium ion battery diaphragm material with composite structure and preparation method of nanometer fiber lithium ion battery diaphragm material

A technology of lithium-ion batteries and nanofibers, applied in electronic equipment, structural parts, fiber processing, etc.

Active Publication Date: 2012-08-08
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mechanical properties and thermal stability of the nanofibrous membrane material can be improved by adopting the outer layer composite material including the intermediate layer and the organic-inorganic composite system with a network structure, while maintaining the advantageous characteristics of the nanofibrous membrane material itself, so as to solve the problem. Problems faced by existing materials

Method used

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  • Nanometer fiber lithium ion battery diaphragm material with composite structure and preparation method of nanometer fiber lithium ion battery diaphragm material
  • Nanometer fiber lithium ion battery diaphragm material with composite structure and preparation method of nanometer fiber lithium ion battery diaphragm material
  • Nanometer fiber lithium ion battery diaphragm material with composite structure and preparation method of nanometer fiber lithium ion battery diaphragm material

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Experimental program
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Effect test

Embodiment 1

[0041] A three-layer nanofiber composite lithium-ion battery membrane material with cellulose non-woven fabric as the middle layer / polymer-ceramic material as the outer layer

[0042] (1) Preparation of electrospinning solution for outer layer material

[0043] Dissolve 80 g of polyvinylidene fluoride (PVDF) in 650 g of N,N-dimethylformamide (DMF) and 276 g of acetone, and stir at a constant temperature of 30°C for 24 hours to obtain a clear and transparent A solution. The mass of PVDF The concentration is 8%; 9 g of silica nanoparticles with a diameter of about 200 nm are added to 100 g of DMF, ultrasonically dispersed for 3 hours, mixed with solution A, and ground at room temperature for 24 hours with a planetary ball mill to obtain a composite spinning solution. The mass of the ceramic material in the composite spinning solution is 40% of the total mass of the polyvinylidene fluoride and the ceramic material.

[0044] (2) Preparation of polymer-ceramic composite nanofibrou...

Embodiment 2

[0049] A three-layer nanofiber composite lithium-ion battery membrane material (PVDF-HFP / PI / PVDF-HFP) with PI non-woven fabric as the middle layer / PVDF-HFP as the outer layer

[0050] (1) Preparation of electrospinning solution for outer layer material

[0051] Dissolve 80 g of vinylidene fluoride-hexafluoropropylene copolymer (PVDF-HFP) in 450 g of DMF and 280 g of acetone, and stir at 30° C. for 24 hours to obtain a clear and transparent A solution.

[0052] (2) Preparation of PVDF-HFP / PI / PVDF-HFP three-layer composite nanofiber lithium-ion battery separator

[0053] The PVDF-HFP spinning solution prepared by step (1) is transported to such as attached with a gear pump figure 1 Schematic of a high-flow electrospinning device, the infusion volume is, for example, 9 mL / needle / hour. A DC high voltage such as 24 kV is applied between the nozzle and the conveyor belt. The distance between the nozzle tip and the conveyor belt is set to 10 cm, for example. The nozzle group perf...

Embodiment 3

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Abstract

The invention relates to a three-layer nanometer fiber composite lithium ion battery diaphragm and a preparation technology of the three-layer nanometer fiber composite lithium ion battery diaphragm. The battery diaphragm comprises a middle layer, a first outer layer and a second outer layer, wherein the first outer layer and the second outer layer are respectively positioned at the two sides of the middle layer, the first outer layer and the second outer layer are static spinning spray coating layers, and the middle layer is combined with the first outer layer and the second outer layer through hot pressing. The porosity of the battery diaphragm is between 40 percent and 70 percent, and the middle layer is used as a support body and has high mechanical intensity. The first outer layer and the second outer layer are made of different materials from the middle layer and are used as functional layers to ensure that the materials have specific chemical and physical characteristics. A great amount of materials can be efficiently prepared by adopting the high-flow-rate static spinning technology and equipment. The material is used as the high-performance lithium ion battery diaphragm, can be applied to miniature and power lithium-ion batteries, and realizes the effects of reducing the battery internal resistance, prolonging the service life of the batteries, improving the charging and discharging performance and the like.

Description

technical field [0001] The invention belongs to the field of electrospinning preparation of nanofiber lithium-ion battery separators, in particular to a nanofiber lithium-ion battery membrane material with a three-layer composite structure prepared by a large-flow electrospinning method, and a preparation method of the material. Background technique [0002] At present, the separator materials used in lithium-ion batteries are still dominated by polyethylene and polypropylene microporous membranes formed by unidirectional or biaxial stretching. The main features of this kind of products are: high-level production technology has been formed in the United States, Japan and other countries, with good mechanical strength and relatively stable performance. However, as a diaphragm material, polyolefin microporous membrane is more suitable for the application of small lithium-ion batteries (such as batteries for mobile digital devices), but not suitable for the application of lithi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16B32B3/12B32B5/26B32B37/06B32B37/10B32B37/15H01M50/414H01M50/417H01M50/426H01M50/429H01M50/434H01M50/443H01M50/457H01M50/489H01M50/491H01M50/494H01M50/497
CPCY02E60/12H01M2/1686B32B2457/10B32B5/26H01M2/16B32B37/06B32B37/15H01M2/1646D04H1/00H01M2/1653B32B2305/20B32B2305/026D01D5/0069B32B3/12Y02E60/10H01M50/417H01M50/497H01M50/457H01M50/491H01M50/443H01M50/429H01M50/414H01M50/494H01M50/489H01M50/434H01M50/426
Inventor 吴大勇孙鹤王为希梁卫华
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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