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Composite separator for batteries and preparation method thereof

A composite diaphragm and battery technology, which is applied in the field of lithium-ion battery materials and processes, can solve the problems of poor mechanical strength, low liquid absorption rate, and poor safety, and achieve good thermal stability, high liquid absorption rate, and high liquid retention rate. Effect

Inactive Publication Date: 2014-09-10
山东威高新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, commercialized separators have problems such as low porosity, low liquid absorption rate, low melting point, poor mechanical strength, and poor safety.

Method used

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  • Composite separator for batteries and preparation method thereof
  • Composite separator for batteries and preparation method thereof
  • Composite separator for batteries and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 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. The slurry includes the following components: 70% polyvinylidene fluoride, 3% coupling agent, plasticizer 5% agent, 17% skeleton filler, among which vinyl trisilane is used as coupling agent, dibutyl phthalate or dioctyl phthalate is used as plasticizer, and nano-scale silica is used as skeleton filler. Add white carbon black, take the above-mentioned components according to the proportion, prepare them in turn through vacuum slurry, wet roller brush to form a film, and make a 40μm film layer, and combine the obtained film layer with the positive and negative electrodes of the lithium-ion battery Sheets are laminated to form a battery unit, and 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 t...

Embodiment 2

[0033] The components are taken according to the following proportions: polyvinylidene fluoride 70%, the inorganic filler of the skeleton is 17% of nano-scale aluminum oxide, 5% of dibutyl phthalate, and 5% of vinyltrisilane after mixing After scraping with a roller, a film is formed with a film thickness of 60 μm. 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 separ...

Embodiment 3

[0035] Composite separator 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, 3% coupling agent, plasticizer 6% agent, 17% skeleton filler, among which vinyl trisilane is used as coupling agent, dibutyl phthalate or dioctyl phthalate is used as plasticizer, and titanium dioxide is used as skeleton filler.

[0036] After the above-mentioned components are taken according to the proportion, they are sequentially prepared by vacuum slurry, wet roller brushing to prepare a film, and a film layer with a thickness of 40 μm is prepared. Stack the sheets to form a battery unit, place the battery unit 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 chamber is -0.06Mpa, and the microwave vibration frequency is 30-...

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Abstract

The invention relates to the technical field of lithium ion battery materials and technologies, and concretely relates to a composite separator for batteries and a preparation method thereof. The composite separator is characterized in that a membrane layer with the thickness of 20-100 mu m is prepared from a slurry by employing a wet-process roller scraping continuous-coating method, and also the composite separator possesses a three-dimension porous structure prepared by employing a phase separation technology; and the slurry comprises the following compositions: 70%-80% of polyvinylidene fluoride, 3%-5% of a coupling agent, 3%-5% of a plasticizer and 10%-15% of a framework filling material, wherein the coupling agent is one or a mixture of vinyltrisilane, polysiloxane, polydimethylsiloxane and methacryloxysilane, the plasticizer is one of dibutyl phthalate, dioctyl phthalate and dibutyl isophthalate, and the framework filling material is one of nanometer-level silicon dioxide, titanium dioxide and aluminium oxide. The composite separator for batteries is high in porosity, high in liquid absorbency and retention rate, large in specific surface area and good in heat stability.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials and technology, in particular to a lithium ion battery with high porosity, high liquid absorption rate, high liquid retention rate, uniform pore size and good toughness, which is suitable for high-power power polymer lithium-ion batteries Composite separator for battery and preparation method thereof. Background technique [0002] One of the key materials for lithium-ion batteries, the diaphragm, is a key material that affects battery safety. At present, most of the PP-PE-PP composite films on the market are from Japan and the United States. Good power battery diaphragm technology is still in the domestic market. blank. Currently commercial separators have problems such as low porosity, low liquid absorption rate, low melting point, poor mechanical strength, and poor safety. Therefore, the new diaphragm has a high melting point, high porosity, and low melting point of the d...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M50/403H01M50/411H01M50/463
CPCH01M50/403H01M50/449Y02E60/10
Inventor 王庆生韩高荣杨哲龙阿纳多里·鲍波维奇
Owner 山东威高新能源科技有限公司
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