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Inorganic nanofiber ceramic diaphragm for lithium ion battery and preparation method thereof

A technology of inorganic nanofibers and lithium-ion batteries, which is applied in the direction of nanotechnology, nanotechnology, nanotechnology, etc. for materials and surface science, and can solve the problems of increased battery internal resistance, resistance to winding, and poor bending resistance of the diaphragm. Poor problems, to achieve the effect of reducing internal resistance, improving puncture resistance, and improving bending resistance

Active Publication Date: 2016-02-03
CHINA HAISUM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the prepared diaphragm has poor bending resistance, is not resistant to winding, and is not suitable for the production of cylindrical batteries, and at the same time, the internal resistance of the battery increases due to the large thickness of the diaphragm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] An inorganic nanofiber ceramic diaphragm for a lithium ion battery is composed of aluminum oxide nanofiber non-woven fabric and a porous base material. Wherein, the aluminum oxide nanofiber non-woven fabric is prepared by electrospinning and calcining the precursor, and the specific process is as follows: the first step: dissolve 1.0g aluminum nitrate in 20g deionized water, and then add 20g weight fraction of 10% PVA solution (average molecular weight of polyvinyl alcohol is 60000), stir evenly, prepare PVA / aluminum nitrate precursor solution; second step: add the above precursor solution to the electrospinning equipment, the spinning voltage is 25KV, extrude The speed is 1.0ml / min. Under the action of the electric field force, the solution sprayed from the nozzle is drawn into fibers and falls on the rotating receiving plate, and the composite fiber non-woven fabric is formed after the solvent volatilizes; the third step: the composite fiber non-woven fabric Arranged ...

Embodiment 2

[0024] An inorganic nanofiber ceramic diaphragm for a lithium ion battery is composed of aluminum oxide nanofiber non-woven fabric and a porous base material. Wherein, the aluminum oxide nanofiber non-woven fabric is prepared by precursor electrospinning and calcining, and the specific process is as follows: the first step: 1.2g aluminum nitrate is dissolved in 28g deionized water, and then 27g weight fraction is added to 10% PVA solution (average molecular weight of polyvinyl alcohol is 60000), stir evenly, prepare PVA / aluminum nitrate precursor solution; second step: add the above precursor solution to the electrospinning equipment, the spinning voltage is 25KV, extrude The speed is 1.5ml / min. Under the action of the electric field force, the solution sprayed from the nozzle is drawn into fibers and falls on the rotating receiving plate, and the composite fiber non-woven fabric is formed after the solvent volatilizes; the third step: the composite fiber non-woven fabric Arra...

Embodiment 3

[0028] An inorganic nanofiber ceramic diaphragm for a lithium ion battery is composed of aluminum oxide nanofiber non-woven fabric and a porous base material. Wherein, the aluminum oxide nanofiber non-woven fabric is prepared by precursor electrospinning and calcining, and the specific process is as follows: the first step: dissolve 1.5g of aluminum nitrate in 25g of deionized water, and then add 25g of 10% PVA solution (average molecular weight of polyvinyl alcohol is 60000), stir evenly, prepare PVA / aluminum nitrate precursor solution; second step: add the above precursor solution to the electrospinning equipment, the spinning voltage is 25KV, extrude The speed is 1.8ml / min. Under the action of the electric field force, the solution sprayed from the nozzle is drawn into fibers and falls on the rotating receiving plate, and the composite fiber non-woven fabric is formed after the solvent volatilizes; the third step: the composite fiber non-woven fabric Arranged in a muffle fu...

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Abstract

The invention provides an inorganic nanofiber ceramic separator for lithium ion batteries and a preparation method thereof. The inorganic nanofiber ceramic separator for lithium ion batteries is characterized in that it is composed of inorganic nanofiber non-woven fabrics and porous substrates. . The preparation method is as follows: the inorganic nanofiber non-woven fabric and the porous substrate are placed between the radiation head of the ultrasonic generator and the roller for ultrasonic bonding. The fiber non-woven fabric faces the soft roll side, the porous substrate faces the hard roll side, the roll pressure is 0.1-0.5 MPa, and after cooling at normal temperature, the inorganic nanofiber ceramic diaphragm for lithium ion batteries is obtained. The invention improves the puncture resistance and bending resistance of the separator, and at the same time reduces the internal resistance of the lithium ion battery separator.

Description

technical field [0001] The invention relates to a novel inorganic nanofiber ceramic diaphragm for lithium-ion batteries and its preparation technology, belonging to the technical field of lithium-ion batteries. Background technique [0002] At present, lithium-ion battery separator materials are mainly polyolefin separators, such as single-layer polypropylene (PP) microporous membranes, single-layer polyethylene (PE) microporous membranes, and three-layer PP / PE / PP composite membranes. The melting point of the polyolefin separator is low: the closed cell temperature of the PE separator is 130-140°C, and that of the PP separator is 150-166°C. The separator is easy to shrink when heated, and the direct contact of the positive and negative electrodes will cause a short circuit of the lithium-ion battery, and it is easy to break at high temperature. film, causing disintegration or explosion of the lithium-ion battery. [0003] In order to overcome the above problems, the use of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/16B82Y30/00B82Y40/00H01M50/431H01M50/44
CPCH01M10/0525B82Y30/00B82Y40/00H01M50/431H01M50/44H01M50/403Y02E60/10
Inventor 贺磊迟婷玉陈宗明杨娇吴立群
Owner CHINA HAISUM ENG