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A kind of preparation method of metal oxide-cellulose composite diaphragm

A technology of composite diaphragm and bacterial cellulose membrane, which is applied in the direction of nanotechnology, structural parts, electrical components, etc. for materials and surface science, and can solve the problems of low liquid absorption rate, low mechanical strength and ion conductivity of diaphragm electrolyte. and the small porosity of the diaphragm to achieve the effect of increased mechanical properties, low equipment requirements, and high porosity

Inactive Publication Date: 2018-11-20
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the bacterial cellulose membrane obtained by the above-mentioned method has the following main disadvantages: the ion conductivity and the porosity of the membrane are small, the mechanical strength is small, and the membrane has little liquid absorption rate for the electrolyte.

Method used

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  • A kind of preparation method of metal oxide-cellulose composite diaphragm
  • A kind of preparation method of metal oxide-cellulose composite diaphragm
  • A kind of preparation method of metal oxide-cellulose composite diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A Pre-compress 10mm aqueous bacterial cellulose wet film under 2MPa pressure for 60s at room temperature;

[0025] B according to the following ratio

[0026]

[0027]

[0028] Prepare a mixed solution, soak the bacterial cellulose membrane pre-pressed in step A in the mixed solution, perform physical adsorption, and take it out after 2 hours;

[0029] C. Place the bacterial cellulose film obtained by physical adsorption in step B to dry under 2MPa heat press. The heat press is divided into two steps: first heat press at 60°C for 20min to volatilize the organic solvent; then heat at 140°C Press for 10 minutes to decompose the aluminum nitrate adsorbed in the bacterial cellulose membrane to produce aluminum oxide and generate gas NH together with N-nitrosamine 3 , NO, NO 2 , to obtain a high-porosity metal alumina-cellulose composite separator.

[0030] The main components of the metal alumina-cellulose composite diaphragm are bacterial cellulose and alumina, an...

Embodiment 2

[0032] A Pre-press a 50mm aqueous bacterial cellulose wet film under a pressure of 0.1MPa for 10s at room temperature;

[0033] B according to the following ratio

[0034]

[0035] Prepare a mixed solution, soak the bacterial cellulose membrane pre-pressed in step A in the mixed solution, perform physical adsorption, and take it out after 2 hours;

[0036] C. Put the bacterial cellulose film obtained by physical adsorption in step B into a 0.1 MPa heat press for drying. The heat press is divided into two steps: first, heat press at 80° C. for 5 minutes to volatilize the organic solvent; and then dry it at 120° C. Hot pressing for 5 minutes, the aluminum nitrate adsorbed in the bacterial cellulose membrane is decomposed to produce metal aluminum oxide, and at the same time, the gas NH is produced together with N-nitrosamine 3 , NO, NO 2 , to obtain a high-porosity metal alumina-cellulose composite separator.

[0037] The main components of the metal alumina-cellulose comp...

Embodiment 3

[0039] A Pre-press 30mm of 30mm aqueous bacterial cellulose wet film under 0.4MPa pressure for 30s at room temperature;

[0040] B according to the following ratio

[0041]

[0042] Prepare a mixed solution, soak the bacterial cellulose membrane pre-pressed in step A in the mixed solution, perform physical adsorption, and take it out after 2 hours;

[0043] C. Dry the bacterial cellulose membrane obtained by physical adsorption in step B in a hot press at 0.4 MPa. The hot press is divided into two steps: first, hot press at 70°C for 10 minutes to volatilize the organic solvent; then dry at 130°C. Hot pressing for 10 minutes, the iron nitrate adsorbed in the bacterial cellulose membrane is decomposed to produce metal iron oxide, and at the same time, the gas NH is produced together with N-nitrosamide 3 , NO, NO 2 , to obtain a metal oxide-cellulose composite separator with high porosity.

[0044] The main components of the metal alumina-cellulose composite diaphragm are b...

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Abstract

The invention provides a metal oxide-cellulose composite membrane for lithium-ion battery membranes. The invention is to immerse the bacterial cellulose membrane in an organic solvent, and the bacterial cellulose membrane absorbs nitrate and nano-oxidation in the organic solvent. It is obtained by decomposing nitrates by step-by-step hot-press drying method. The thickness of the bacterial cellulose membrane is less than 35 microns, and the porosity is greater than 70%. When the metal oxide-cellulose composite diaphragm prepared by the invention is used as a lithium ion battery diaphragm, it has the characteristics of high mechanical strength, good wettability, high porosity and high ion conductivity, and is beneficial to the industrial production of new power batteries. The preparation method of the invention has the characteristics of simple process flow, low equipment requirements, low cost and suitable for industrialized production.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery preparation, belongs to the field of electrochemistry, and in particular relates to a preparation method of a metal oxide-cellulose composite diaphragm used for lithium ion battery diaphragms. Background technique [0002] In the lithium-ion battery structure, the diaphragm is a key component of the battery. The performance of the diaphragm determines the interface structure and internal resistance of the battery, which directly affects the capacity, cycle, and safety performance of the battery. A diaphragm with excellent performance can improve the comprehensive performance of the battery. Performance plays an important role. The main function of the diaphragm is to separate the positive and negative electrodes of the battery, prevent the two electrodes from contacting and short circuit, and also have the function of allowing electrolyte ions to pass through. Traditional lithium-ion ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/14B82Y30/00H01M50/403H01M50/44H01M50/446H01M50/489
CPCB82Y30/00H01M50/403Y02E60/10
Inventor 范玲玲彭硕许杰饶维达徐卫林柏自奎
Owner WUHAN TEXTILE UNIV
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