Electrolyte film and porous substrate and preparation thereof, lithium ion secondary battery

A secondary battery, electrolyte membrane technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor electrolyte affinity, easy electrolyte leakage, and battery performance degradation, and achieve liquid absorption performance. Good, improve cycle performance and safety performance, improve the effect of liquid absorption capacity

A secondary battery, electrolyte membrane technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of poor electrolyte affinity, easy electrolyte leakage, and battery performance degradation, and achieve liquid absorption performance. Good, improve cycle performance and safety performance, improve the effect of liquid absorption capacity

CN101388441AInactive Publication Date: 2009-03-18PANASONIC CORP +1
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  • Electrolyte film and porous substrate and preparation thereof, lithium ion secondary battery
  • Electrolyte film and porous substrate and preparation thereof, lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Preparation of polyvinylidene fluoride nonwoven fabric

[0036] Stir 10g of polyvinylidene fluoride with a weight average molecular weight of 530,000, 10g of acetone, and 80g of N,N-dimethylacetamide at 55°C to prepare a polyvinylidene fluoride spinning solution, and prepare the prepared polyvinylidene fluoride The ethylene spinning solution was injected into the electrospinning equipment, and the aluminum foil was used as the receiving screen, and the electrospinning was carried out under the conditions of a voltage of 60kV and a distance from the spinneret to the receiving screen of 30cm, and polyvinylidene fluoride with an average fiber diameter of 115nm was obtained. Non-woven fabric composed of vinyl fibers. The film thickness of the obtained polyvinylidene fluoride nonwoven fabric is about 50 μm, and the porosity is about 80%;

[0037] (2) Modification of polyvinylidene fluoride nonwoven fabric

[0038] ① For electron beam irradiation of polyvinylidene fluor...

Embodiment 2

[0046] (1) Preparation of polyvinylidene fluoride nonwoven fabric

[0047] Stir 13g of polyvinylidene fluoride with a weight average molecular weight of 275,000, 12g of acetone, and 75g of N,N-dimethylacetamide at 55°C to form a polyvinylidene fluoride spinning solution, and inject the polyvinylidene fluoride spinning solution into In the electrospinning equipment, the aluminum foil is used as the receiving screen, and the electrospinning is carried out under the condition of the voltage of 60kV and the distance from the spinneret to the receiving screen of 20cm, and the polyvinylidene fluoride fiber with an average fiber diameter of 137nm is obtained. spinning. The film thickness of the obtained polyvinylidene fluoride nonwoven fabric is about 65 μm, and the porosity is about 70%;

[0048] (2) Modification of polyvinylidene fluoride nonwoven fabric

[0049] ① For electron beam irradiation of polyvinylidene fluoride non-woven fabrics:

[0050] Arrange polyvinylidene fluorid...

Embodiment 3

[0055] (1) Preparation of polyvinylidene fluoride nonwoven fabric

[0056] Stir 11g of polyvinylidene fluoride with a weight average molecular weight of 534,000, 10g of acetone, and 79g of N,N-dimethylacetamide at 55°C to form a polyvinylidene fluoride spinning solution, and prepare the prepared polyvinylidene fluoride The spinning liquid is injected into the electrospinning equipment, and the aluminum foil is used as the receiving screen, and the electrospinning is carried out under the conditions of a voltage of 60kV and a distance of 25cm from the spinneret to the receiving screen to obtain polyvinylidene fluoride fibers with an average fiber diameter of 126nm The non-woven fabric composed of polyvinylidene fluoride has a film thickness of about 80 μm and a porosity of about 75%;

[0057] (2) Modification of polyvinylidene fluoride nonwoven fabric

[0058] ①Irradiation of polyvinylidene fluoride nonwoven fabric:

[0059] Arrange polyvinylidene fluoride nonwovens in the ai...

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Abstract

The invention relates to a gel-type polymer electrolyte film for a lithium ion secondary battery and a process for preparation, and a lithium ion secondary battery which contains the electrolyte film. The gel-type polymer electrolyte film for the lithium ion secondary battery can be obtained through the following method: preparing polyvinylidene fluoride nonwoven through the electrostatic spinning method, making the surface of the polyvinylidene fluoride nonwoven activate through radiating electron beams for the obtained the polyvinylidene fluoride nonwoven in air, contacting a methyl methacrylate monomer and the polyvinylidene fluoride nonwoven after the surface activation, thereby obtaining the polyvinylidene fluoride nonwoven whose surface is grafted with polymethyl methacryate. Furthermore, the lithium ion battery electrolyte film can be obtained through making the polyvinylidene fluoride nonwoven whose surface is grafted with polymethyl methacryate absorbs a certain amount of electrolytic solution. The invention develops the respective advantages in the lithium ion battery owing to using the polyvinylidene fluoride nonwoven whose surface is grafted with polymethyl methacryate, compared with singly using polyvinylidene fluoride or polymethyl methacryate or the both simple composite, and eliminates the disadvantages caused by singly using one material or several materials. The electrolyte film has high ion electrical conductivity under ambient temperature after absorbing the electrolytic solution, and can manifest excellent heavy-current discharge performance and circulation stability after being assembled in the batteries.

Description

technical field [0001] The invention relates to an electrolyte membrane for a lithium ion secondary battery and a preparation method thereof, in particular to a gel-type polymer electrolyte membrane for a lithium ion secondary battery and a preparation method thereof, and a lithium electrolyte membrane comprising the above electrolyte membrane ion secondary battery. Background technique [0002] The research of high energy density battery is getting more and more attention along with the improvement of people's requirements for environmental quality, and as an important part of high energy density battery, electrolyte becomes the key to development. Due to the poor electrochemical stability of the batteries used in the past, it is a good solution to use polymer electrolytes in high energy density battery systems. The room temperature ionic conductivity of all-solid polymer electrolytes has so far been unable to reach 10 -3 S cm -1 The level of application (Komiya, Hayashi...

Claims

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Application Information

Patent Timeline
18 Mar 2009
Publication
CN101388441A
IPC
H01M2/16; H01M10/40; C08J5/18; C08J9/00; H01M50/403; H01M50/417
CPC
Y02E60/122; Y02E60/10
Inventors
李志明; 杨军