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Cellulose/inorganic particle composite diaphragm for lithium secondary battery and preparation method thereof

A lithium secondary battery and inorganic particle technology, which is applied to battery components, circuits, electrical components, etc., can solve the problems of cellulose paper airtightness, strength, and electrochemical performance that cannot meet the requirements of secondary battery diaphragm materials. , to achieve the effects of good chemical stability, environmentally friendly materials and simple process

Inactive Publication Date: 2012-06-27
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the airtightness, strength and electrochemical properties of cellulose paper prepared by conventional papermaking processes cannot meet the requirements of separator materials for secondary batteries.

Method used

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  • Cellulose/inorganic particle composite diaphragm for lithium secondary battery and preparation method thereof
  • Cellulose/inorganic particle composite diaphragm for lithium secondary battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Add 1 liter of distilled water to 20 grams of hardwood pulp (needle kraft pulp), soak and grind at a high speed, beating to make a hardwood plant fiber slurry with a concentration of 2wt%, the CFS value is 600, and the fiber diameter is 0.8 micron. 1 gram of silicon dioxide with a particle size of 50nm is dispersed in 100 ml of water, 0.2 gram of urea-formaldehyde resin is added, and fully mixed with cellulose slurry, paper is made by a semi-automatic paper machine, and the wet paper is removed by squeezing with a press roller excess moisture. Put the rolled wet paper into ethanol, replace the moisture in the wet paper twice with ethanol, and dry at 35°C to make a cellulose composite separator with a thickness of 35 microns.

Embodiment 2

[0047] Add 1 liter of distilled water to 20 grams of hemp pulp, after soaking, through high-speed grinding and beating, make a hardwood plant fiber slurry with a concentration of 2wt%, the CFS value is 500, and the fiber diameter is 0.8 micron. Silica is dispersed in 100 ml of water, 0.2 g of urea-formaldehyde resin is added, and fully mixed with cellulose slurry, paper is made by a semi-automatic paper machine, and the wet paper sheet is squeezed with a press roller to remove excess water. Put the rolled wet paper into acetone, replace the moisture in the wet paper twice with acetone, and dry at 35° C. to prepare a cellulose composite separator with a thickness of 35 μm.

Embodiment 3

[0049] Add 1 liter of distilled water to 20 grams of hardwood pulp (needle kraft pulp), soak and grind at a high speed, beating to make a hardwood plant fiber slurry with a concentration of 2wt%, the CFS value is 300, and the fiber diameter is 0.6 micron. 1 gram of aluminum oxide with a particle size of 500nm is dispersed in 100 milliliters of water, 0.2 grams of melamine formaldehyde resin is added, and fully mixed with cellulose slurry, paper is made by a semi-automatic paper machine, and the wet paper is rolled with a press roll Press to remove excess water. Put the rolled wet paper into ethanol, replace the moisture in the wet paper twice with ethanol, and dry at 35°C to prepare a cellulose composite separator with a thickness of 30 microns.

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Abstract

The invention provides a cellulose / inorganic particle composite diaphragm for a lithium secondary battery and a preparation method thereof. The cellulose diaphragm is prepared by beating a cellulosic material like wood pulp, jute pulp or cotton pulp into cellulose with a microfibrous structure, mixing the cellulose with inorganic particles to prepare a cellulose / inorganic particle composite wet membrane material and carrying out solvent replacement and drying; the diaphragm prepared by compositing the cellulose and the inorganic particles can be used as a non-aqueous lithium ion battery diaphragm material. The diaphragm prepared in the invention has good heat resistance, resistance to chemical solvents and good mechanical performance and can satisfy requirements for diaphragms of non-aqueous electrolytic solution energy storage devices; furthermore, since regenerable cellulose is used as a raw material, the diaphragm has the advantages of low cost, a simple process and environmental friendliness.

Description

technical field [0001] The present invention relates to a separator for electrochemical devices and its manufacturing method, more particularly, the present invention relates to a separator made of composites of cellulose and inorganic microparticles, which has high heat resistance and chemical stability, and its application . Background technique [0002] In recent years, electrochemical devices for energy storage have received extensive attention. Rechargeable secondary batteries have been widely used in digital products such as mobile phones, video cameras, cameras, and notebook computers, and have begun to be used in fields such as electric vehicles. The requirements for high power and high capacity of lithium-ion secondary batteries are increasing day by day. At some point, lithium-ion batteries are prone to safety hazards such as smoke, fire, explosion, and even personal injury, making high-capacity and power lithium-ion batteries It has not been widely used yet, so i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M2/16
CPCY02E60/12Y02E60/10
Inventor 崔光磊孔庆山刘志宏张建军韩鹏献姚建华徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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