High efficiency diaphragm material of lithium ion battery and preparation method of diaphragm material

A technology for lithium-ion batteries and diaphragm materials, which is applied in the field of high-efficiency diaphragm materials for lithium-ion batteries and its preparation. It can solve problems such as backward production methods, low membrane rupture temperature, and poor wettability of diaphragms, so as to improve transmission capacity and battery capacity. , Improve the effect of wettability

Inactive Publication Date: 2016-04-20
浙江锂盾储能材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the technology and production method of lithium-ion battery separators are relatively backward, the membrane rupture temperature is low and the closed cell temperature is high, the wettability of the separator is poor, and the corresponding battery capacity is also small

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A high-efficiency diaphragm material for a lithium-ion battery, the diaphragm material comprising 3% acrylate resin, 3% polyolefin and 94% polychlorotrifluoroethylene, tetrafluoroethylene, hexafluoropropylene mixture, the resulting separator material had a thickness of 25 μm.

[0017] A method for preparing a high-efficiency diaphragm material for a lithium-ion battery, comprising the following steps:

[0018] Step 1: Blending, melting, extruding, stretching and blowing a mixture of 3% acrylic resin, 3% polyolefin and 94% polychlorotrifluoroethylene, tetrafluoroethylene and hexafluoropropylene. The base film is obtained from the film, and the melt co-extrusion temperature is: 230°C;

[0019] Step 2: performing plasma treatment on the material obtained in step 1 in an air environment to obtain a diaphragm material.

[0020] The cell closure temperature of the diaphragm prepared in this example was 130° C., the rupture temperature was 260° C., and the liquid absorption ...

Embodiment 2

[0022] A high-efficiency diaphragm material for a lithium-ion battery, the diaphragm material includes acrylate resin with a content of 10%, polyolefin with a content of 15%, and polyperfluoroethylene propylene, polyvinyl fluoride, and fluoride with a content of 75%. A mixture of ethylene and chlorotrifluoroethylene copolymer, the thickness of the obtained separator material is 30 μm.

[0023] A method for preparing a high-efficiency diaphragm material for a lithium-ion battery, comprising the following steps:

[0024] Step 1: 10% acrylate resin, 15% polyolefin and 75% polyperfluoroethylene propylene, polyvinyl fluoride, vinylidene fluoride and chlorotrifluoroethylene copolymer blending, melting, extrusion, stretching The base film is obtained by blowing the film, and the melt co-extrusion temperature is: 250°C;

[0025] Step 2: performing plasma treatment on the material obtained in step 1 in an air environment to obtain a diaphragm material.

[0026] The cell closure tempe...

Embodiment 3

[0028] A high-efficiency diaphragm material for a lithium-ion battery, the diaphragm material includes acrylate resin with a content of 20%, polyolefin with a content of 25%, and copolymers of vinylidene fluoride and hexafluoroisobutylene and tetrafluoroethylene with a content of 55%. A mixture with a perfluoroalkyl vinyl ether copolymer yields a separator material with a thickness of 35 μm.

[0029] A method for preparing a high-efficiency diaphragm material for a lithium-ion battery, comprising the following steps:

[0030] Step 1: Take 20% acrylate resin, 25% polyolefin, vinylidene fluoride and hexafluoroisobutylene copolymer, tetrafluoroethylene and perfluoroalkyl vinyl ether copolymer, blend, melt, extrude, pull Stretching and blowing the film to obtain the base film, the melt co-extrusion temperature is: 270°C;

[0031] Step 2: performing plasma treatment on the material obtained in step 1 in an air environment to obtain a diaphragm material.

[0032] The closed cell t...

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Abstract

The invention provides a high efficiency diaphragm material of a lithium ion battery and a preparation method of the diaphragm material. The diaphragm material is prepared from acrylate resin, polyolefine and a fluor membrane material. The preparation method comprises the following steps: firstly, performing co-mixing, fusion, extrusion and stretching membrane blowing on the acrylate resin, the polyolefine and the fluor membrane material, so as to obtain a basal membrane, wherein the fusion and co-extrusion temperature is 230 to 270 DEG C; secondly, performing plasma treatment on a material obtained in the first step in an air environment, so as to obtain the diaphragm material. Compared with the prior art, the diaphragm material has the advantages that the membrane rupture temperature can be effectively increased, the diaphragm cell closing temperature can be effectively reduced, a diaphragm can effectively improve the wettability of electrolyte, and in the battery application, the transmitting capacity of lithium ions in the battery between a positive electrode and a negative electrode can be effectively improved, and the battery capacity can be improved.

Description

technical field [0001] The invention relates to the field of production of lithium battery diaphragms, in particular to a high-efficiency diaphragm material for lithium ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are mainly composed of five materials: positive electrode material, negative electrode material, electrolyte, separator, and outer packaging material. Among them, the diaphragm material, as one of the important components of the lithium-ion battery, has been receiving much attention. The diaphragm is a microporous film placed between the positive and negative electrodes of the battery. Its main function is to separate the positive and negative electrodes of the lithium battery to avoid short circuits, and Provide free passage for lithium ions to achieve a closed loop. In addition, the lithium-ion battery separator is a polymer functional membrane material with nano-scale micropores. It is required that it does...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M50/403H01M50/414H01M50/417H01M50/426
CPCH01M50/403H01M50/411Y02E60/10
Inventor 章结兵谢凤秀
Owner 浙江锂盾储能材料技术有限公司
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