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Lithium battery diaphragm and preparation method therefor, and application of lithium battery diaphragm in lithium battery

A lithium battery separator and electrospinning technology, applied in the field of electrochemistry, can solve problems such as poor thermal stability, low electrolyte absorption rate, inability to guarantee lithium battery safety and stable cycle performance, etc., to improve wettability and benefit The effect of fast charge and discharge, good chemical stability

Inactive Publication Date: 2017-06-20
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a lithium battery separator and its preparation method and application in lithium batteries, so as to overcome the poor thermal stability and low electrolyte absorption rate of existing lithium battery separators, which cannot guarantee the safety of lithium batteries and cycle stability defects

Method used

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  • Lithium battery diaphragm and preparation method therefor, and application of lithium battery diaphragm in lithium battery
  • Lithium battery diaphragm and preparation method therefor, and application of lithium battery diaphragm in lithium battery
  • Lithium battery diaphragm and preparation method therefor, and application of lithium battery diaphragm in lithium battery

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preparation example Construction

[0026] The invention provides a method for preparing a lithium battery separator, the method comprising the following steps:

[0027] (1) Preparation of electrospinning solution: mix soluble inorganic salt and solvent to form an inorganic salt solution with a mass fraction of 5%-20%, and mix the template polymer with a solvent to form a polymeric solution with a mass fraction of 5%-20%. compound solution, mixing the inorganic salt solution and the polymer solution to obtain an electrospinning solution, the mass ratio of the inorganic salt solution and the polymer solution is 4:1-1:4;

[0028] (2) Electrospinning: inject the electrospinning solution into the syringe of the electrospinning device for electrospinning to obtain a hybrid fiber membrane, set the injection speed to 50 μL / min-500 μL / min, and the rotational speed of the receiving drum 50r / min-100r / min, the reciprocating speed of the slide table is 0.5cm / min-5cm / min, the spinning voltage is 5kV-15kV, and the receiving d...

Embodiment 1

[0037] The lithium battery separator prepared in this example is SiO 2 nanofiber membrane

[0038] (1) Preparation of electrospinning solution: mix tetraethyl orthosilicate (TEOS) with deionized water to form a solution of orthoethyl silicate (TEOS) with a mass fraction of 5%, and mix polyvinyl alcohol (PVA) with deionized water Ionized water is mixed to form a polyvinyl alcohol (PVA) solution with a mass fraction of 5%, and tetraethyl orthosilicate (TEOS) solution and polyvinyl alcohol (PVA) solution are mixed to obtain an electrospinning solution, and tetraethyl orthosilicate ( The mass ratio of TEOS) solution and polyvinyl alcohol (PVA) solution is 4:1;

[0039] (2) Electrospinning: inject the electrospinning solution into the syringe of the electrospinning device for electrospinning to obtain a hybrid fiber membrane, set the injection speed to 100 μL / min, and the speed of the receiving drum to be 50 r / min. The reciprocating speed of the table is 1cm / min, the spinning vol...

Embodiment 2

[0044] The lithium battery separator prepared in this example is Al 2 o 3 nanofiber membrane

[0045] (1) Preparation of electrospinning solution: aluminum nitrate (Al(NO 3 ) 3 ) mixed with deionized water to form aluminum nitrate (Al(NO 3 ) 3 ) solution, polyethylene oxide (PEO) and deionized water were mixed to form a polyethylene oxide (PEO) solution with a mass fraction of 11%, aluminum nitrate (Al(NO 3 ) 3 ) solution and polyethylene oxide (PEO) solution were mixed to obtain electrospinning solution, aluminum nitrate (Al(NO 3 ) 3 ) solution and the mass ratio of polyethylene oxide (PEO) solution is 2:1;

[0046] (2) Electrospinning: inject the electrospinning solution into the syringe of the electrospinning device for electrospinning to obtain a hybrid fiber membrane, set the injection speed to 200 μL / min, and the rotational speed of the receiving drum to be 80 r / min. The reciprocating speed of the table is 3cm / min, the spinning voltage is 15kV, and the receiving...

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Abstract

The invention discloses a lithium battery diaphragm and a preparation method therefor, and an application of the lithium battery diaphragm in a lithium battery. The lithium battery diaphragm is an inorganic nanofiber film; inorganic components can reinforce thermal dimensional stability of the lithium battery diaphragm, so that the lithium battery diaphragm can obtain relatively high heat resistance and stability; the inorganic components can improve wettability of the lithium battery diaphragm and an electrolyte; the inorganic nanofiber film is relatively high in porosity, so that the electrolyte absorptivity and ionic conductivity of the lithium battery diaphragm can be improved, and the cycling performance and the rate capability of the lithium battery can be enhanced; the lithium battery diaphragm prepared by an electrospinning technique has the advantages of high temperature resistance and high porosity, and the obtained lithium battery diaphragm can bear high temperature treatment for a relatively long time without causing an obvious thermal shrinkage phenomenon; the preparation method for the lithium battery diaphragm is simple in process and high in production efficiency; and the prepared lithium battery diaphragm can satisfy the safety requirement of a high-capacity lithium ion battery.

Description

technical field [0001] The invention belongs to the technical field of electrochemistry, and in particular relates to a lithium battery separator, a preparation method thereof and an application in lithium batteries. Background technique [0002] Lithium batteries have the advantages of high energy density, long life, small self-discharge, no memory effect, and environmental friendliness, and have become the most valued new energy storage batteries at present. Although the safety of lithium batteries has been significantly improved after years of continuous improvement, in extreme environments or abuse conditions, the heat generation rate of the battery is much higher than the heat dissipation rate, resulting in heat accumulation inside the battery, which further causes the battery to burn or even explode. serious threat to human property and life. Especially in recent years, in order to meet the needs of electric vehicles and energy storage systems, the research and develo...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/052H01M50/44
CPCH01M10/052H01M50/403H01M50/431H01M50/44Y02E60/10
Inventor 石川龙云泽朱建伟宁新
Owner QINGDAO UNIV
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