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Bacterial cellulose porous thin film and preparation method thereof

A bacterial cellulose and porous film technology, applied in electrical components, electrochemical generators, circuits, etc., can solve the problems of long drying cycle, complex process, high energy consumption, etc., and achieve the effect of short process cycle and simple preparation process

Active Publication Date: 2014-11-19
HAINAN GUANGYU BIOTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional freeze-drying, supercritical drying and other processes have the disadvantages of complex process, high cost, and long drying cycle.
However, direct drying of bacterial cellulose wet membrane membranes by hot pressing has the disadvantages of high energy consumption, small membrane porosity, and low ionic conductivity.

Method used

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  • Bacterial cellulose porous thin film and preparation method thereof
  • Bacterial cellulose porous thin film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Pre-compress a 10 cm thick bacterial cellulose wet film under a pressure of 0.01 MPa for 30 seconds, soak the pre-compressed bacterial cellulose film in acetone for 5 min, and then replace the bacterial cellulose film with acetone at 0.01 Under the pressure of MPa, carry out hot-press drying for 5 minutes, and the heating temperature is 80 o c. A bacterial cellulose porous film was obtained.

[0027] The main chemical composition of the bacterial cellulose porous film is bacterial cellulose, the thickness of the film is less than 20 microns, the porosity is greater than 50%, and it has high ion conductivity in the electrolyte (such as figure 2 shown).

[0028]

Embodiment 2

[0030] A 15 cm thick bacterial cellulose wet film was pre-compressed under a pressure of 0.05 MPa for 15 seconds, and the pre-compressed bacterial cellulose film was soaked in methanol for 10 min, and then the methanol-substituted bacterial cellulose film was placed at 0.05 Carry out hot-press drying under MPa pressure for 10 min, heating temperature is 60 o c. A bacterial cellulose porous film was obtained.

[0031] The main chemical component of the bacterial cellulose porous film is bacterial cellulose, the thickness of the film is less than 30 microns, the porosity is greater than 50%, and the ion conductivity in the electrolyte is similar to that of Example 1.

[0032]

Embodiment 3

[0034] The 8 cm thick bacterial cellulose wet film was pre-compressed under 0.1MPa pressure for 2 seconds, the pre-compressed bacterial cellulose film was soaked in ethanol for 15 min, and then the bacterial cellulose film after ethanol replacement was placed in 0.1 Under the pressure of MPa, hot-press drying was carried out for 15 minutes, and the heating temperature was 40 o c. A bacterial cellulose porous film was obtained.

[0035] The main chemical component of the bacterial cellulose porous film is bacterial cellulose, the thickness of the film is less than 20 microns, the porosity is greater than 50%, and the ion conductivity in the electrolyte is similar to that of Example 1.

[0036]

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Abstract

The invention provides a bacterial cellulose porous thin film for a lithium ion battery separator. The bacterial cellulose porous thin film is obtained by replacing water in a bacterial cellulose wet film with an organic solvent, then hot-pressing and drying. The bacterial cellulose porous thin film has the thickness of less than 40 microns and the porosity of greater than 50%. The invention further provides a preparation method of the bacterial cellulose porous thin film. The lithium ion battery separator prepared by the bacterial cellulose porous thin film has the characteristics of high porosity and high ionic conductivity, and is beneficial for promoting an industrialization process of the power lithium ion battery separator. The preparation method of the bacterial cellulose porous thin film has the advantages of being simple in preparation process, short in process period, and suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium-ion batteries, in particular to a bacterial cellulose porous film used for lithium-ion battery separators and a preparation method thereof. [0002] Background technique [0003] The separator is the core component of the lithium-ion battery, which largely determines the performance, safety, service life and other important performance indicators of the lithium-ion battery. Compared with traditional lithium-ion batteries, the working environment of new lithium-ion power batteries is more complicated, requiring higher power charging and discharging, higher safety and longer service life. Traditional lithium-ion battery separators cannot meet the performance requirements of power batteries. Therefore, the development of high-performance new power lithium-ion diaphragms has become an important field of technology competition in developed countries and regions in the automotive indust...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M2/14
CPCH01M10/0525H01M50/403H01M50/4295H01M50/44Y02E60/10
Inventor 蒋峰景钟春燕章俊良余晴春钟宇光
Owner HAINAN GUANGYU BIOTECH
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