Composite isolation membrane for lithium-ion battery and preparation method of composite isolation membrane

A lithium-ion battery, separator technology, applied in secondary batteries, battery pack components, separators/films/diaphragms/spacers, etc., can solve the problems of low porosity, poor safety, low melting point, etc. High liquid absorption rate, high liquid retention rate, good toughness effect

Inactive Publication Date: 2017-05-03
浙江长兴中俄新能源材料技术研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current commercialized multi-layer structure isolation membrane has problems such as low porosity, less liquid absorption, low melting point, and poor safety.

Method used

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  • Composite isolation membrane for lithium-ion battery and preparation method of composite isolation membrane
  • Composite isolation membrane for lithium-ion battery and preparation method of composite isolation membrane
  • Composite isolation membrane for lithium-ion battery and preparation method of composite isolation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Composite diaphragm for batteries, a film layer with a thickness of 40 μm is prepared by the wet roller scraping continuous coating method from the slurry, and the slurry includes the following components: 70% polyvinylidene fluoride, 5% coupling agent, plasticizer 8% agent, 17% skeleton filler, among which vinyl trisilane is used as coupling agent, dibutyl phthalate or dioctyl phthalate is used as plasticizer, and silica is used as skeleton filler. After the parts are taken according to the proportion, they are prepared sequentially through vacuum slurry, and after wet roller brushing to prepare a film, a film layer with a thickness of 40 μm is obtained, and the obtained film layer is laminated with the positive and negative plates of the lithium-ion battery to form Battery unit, the battery unit is placed in a three-stage phase separation device for extraction, the extraction agent is methanol, the extraction temperature is 40°C, the vacuum degree of the extraction cha...

Embodiment 2

[0035] The components are taken according to the following proportions: polyvinylidene fluoride 70%, the inorganic filler of the skeleton is SiO2 17%, dibutyl phthalate 8%, vinyltrisilane 5% and formed after mixing and roller scraping coating. film, film thickness m. The separator and the positive and negative electrodes are laminated in the order of negative electrode-diaphragm-positive electrode (double-sided)-diaphragm-negative electrode to form a battery unit. The battery unit is placed in a three-stage phase separation device for extraction to form a porous structure. Methanol is used as the extraction agent, the temperature is controlled at 40°C, the system maintains a vacuum of -0.06MPa, and the microwave vibration frequency is 30-40Hz. Phase separation was achieved through primary, secondary, and tertiary extractions, respectively. The concentration of extractant in the primary solvent chamber is 91%, and the phase separation time is 45min; the concentration of extrac...

Embodiment 3

[0037]Composite diaphragm for batteries, a film layer with a thickness of 80 μm is prepared by the wet roller scraping continuous coating method from the slurry, and the slurry includes the following components: 70% polyvinylidene fluoride, 5% coupling agent, plasticizer 8% agent, 17% skeleton filler, among which vinyl trisilane is used as coupling agent, dibutyl phthalate or dioctyl phthalate is used as plasticizer, and silica is used as skeleton filler. After the parts are taken according to the proportion, they are prepared sequentially through vacuum slurry, and after wet roller brushing to prepare a film, a film layer with a thickness of 40 μm is obtained, and the obtained film layer is laminated with the positive and negative plates of the lithium-ion battery to form Battery unit, the battery unit is placed in a three-stage phase separation device for extraction, the extraction agent is methanol, the extraction temperature is 40°C, the vacuum degree of the extraction cham...

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Abstract

The invention provides a composite isolation membrane for a lithium-ion battery. The composite isolation membrane is characterized in that various component materials required by the isolation membrane are stirred in a ketone or carboxylate organic solvent in vacuum to prepare isolation membrane paste, and a membrane layer of which the thickness is 20-100 microns is directly prepared on a mylar film carrier or a positive plate or a negative plate of the battery by adopting a wet roller scraping and continuous coating method. The isolation membrane provided by the invention has unique combination of high porosity and high distortion; a resistance value of the prepared lithium battery is lower than those of other batteries in the industry, generated heat is low when the battery works at high power and the performance of the power battery is expected to be improved to that of a new generation.

Description

[0001] Technical field: [0002] The invention relates to the preparation of electrodes for polymer lithium ion batteries, in particular to a composite separator for lithium ion batteries and a preparation method thereof. [0003] Background technique: [0004] As a key part affecting the safety of batteries, the separator film of lithium-ion batteries is currently on the market mainly with PP-PE-PP multilayer structure films, all of which come from Japan and the United States. The current commercialized multilayer structure isolation membranes have problems such as low porosity, less liquid absorption, low melting point, and poor safety. The novel isolation membrane proposed by the present invention has the characteristics of high melting point, high porosity, high strength, etc., so it can not only meet the high-power charge and discharge performance required by the power battery, but also effectively avoid the contact between the positive and negative electrodes caused by th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/14H01M2/16H01M10/0525
CPCH01M10/0525H01M50/40H01M50/403H01M50/409H01M50/411Y02E60/10
Inventor 王庆生
Owner 浙江长兴中俄新能源材料技术研究院有限公司
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