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Cellulose/polymer fiber composite diaphragm material for lithium secondary battery and preparation method thereof

A lithium secondary battery and composite diaphragm technology, which is applied in battery pack parts, circuits, electrical components, etc., can solve the problem that the diaphragm cannot be used directly, the air tightness and strength of cellulose paper, and the electrochemical performance cannot meet the secondary battery. Using diaphragm materials and other issues to achieve the effects of good chemical stability, low cost, and high heat resistance

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

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Problems solved by technology

[0004] Chinese Patent Publication No. CN 101728504A discloses a flexible base material for lithium-ion battery diaphragm made by wet process and its manufacturing method. The fibers are bonded fibers, which are obtained by dehydration wet-sheeting of inclined nets, rotary nets and double nets. The pore size of the substrate prepared by this invention reaches 35 microns, which cannot be used directly as a diaphragm
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/polymer fiber composite diaphragm material for lithium secondary battery and preparation method thereof

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Experimental program
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Embodiment 1

[0031] Add 98 kilograms of deionized water to 2 kilograms of hardwood pulp (needle kraft pulp), soak and grind at a high speed, beating to make a cellulose slurry with a concentration of 2wt%, the fiber diameter is 0.8 microns, and the fiber length of 0.2 kilograms is 6 Ultrafine polyester fibers with a diameter of 1 mm and a diameter of 1 micron and a carboxymethyl cellulose aqueous solution with a concentration of 1% are dispersed in the cellulose slurry, and after thorough mixing, stirring and dilution to make a thin slurry with a concentration of 0.5%, use Fourdrinier paper The machine is used for online copying, and the excess water is removed by pressing. The wet composite diaphragm material after rolling was immersed in ethanol, the moisture in the wet paper was replaced twice with ethanol, and dried at 55°C to prepare a composite diaphragm with a thickness of 30 microns.

Embodiment 2

[0033] Add 98 kilograms of deionized water to 2 kilograms of cotton pulp, after soaking, grind at high speed and beating to make a cellulose slurry with a concentration of 2wt% and a fiber diameter of 0.5 microns. Superfine polyester fiber and carboxymethyl cellulose aqueous solution with a concentration of 1% are dispersed into the cellulose slurry, and after full mixing and dilution, a thin slurry with a concentration of 0.5% is made, and the fourdrinier paper machine is used for online papermaking and pressing. Remove excess moisture. The rolled wet composite diaphragm material was immersed in methanol, the water in the wet paper was replaced twice with methanol, and dried at 50°C to prepare a composite diaphragm with a thickness of 30 microns.

Embodiment 3

[0035] Add 98 kilograms of deionized water to 2 kilograms of cotton pulp, after soaking, grind at a high speed and beat to make a cellulose slurry with a concentration of 2wt%, and the fiber diameter is 0.5 microns. Ultrafine polyester fibers and 3% polyvinyl alcohol aqueous solution are dispersed into the cellulose slurry, mixed and diluted to make a 0.3% thin slurry, and the fourdrinier paper machine is used for online papermaking, and the excess is removed by pressing. of moisture. The wet composite diaphragm material after rolling was immersed in acetone, the water in the wet paper was replaced twice with acetone, and dried at 60°C to prepare a composite diaphragm with a thickness of 35 microns.

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Abstract

The invention provides a cellulose / polymer fiber composite material for a lithium secondary battery and a preparation method thereof. The composite material is prepared by papermaking structural fibers of celluloses and superfine polymer fibers through a wet paper making technology, wherein the celluloses are obtained by beating cellulose raw materials of a wood pulp or a jute pulp, a cotton pulp and the like and have microfibrillar structures. The composite material prepared through the preparation method of the invention has the characteristics of small thermal contraction, high thermal stability and good mechanical performance and can satisfy diaphragm requirements of a nonaqueous electrolyte energy storage device; and additionally, the composite material which partially adopts renewable celluloses as the raw material has the advantages of low cost, simple process and environmental protection.

Description

Technical field: [0001] The present invention relates to a separator for electrochemical devices and a manufacturing method thereof, more particularly, the present invention relates to a separator for lithium secondary batteries made of cellulose and thermoplastic polymer ultrafine fibers and applications thereof, the composite separator Has high heat resistance and excellent mechanical properties. 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-capac...

Claims

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Application Information

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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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