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Application of mixed cellulose ester film, prepared battery and preparation method

A technology of mixing cellulose and ester film, used in secondary battery manufacturing, secondary battery, battery pack parts and other directions, can solve the problem of high porosity, achieve low cost, prolong cycle life, and widely used

Active Publication Date: 2020-08-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This membrane is a filter membrane with good hydrophilicity, high porosity, and uniform microporous structure. It is widely used in the pharmaceutical industry, electronics industry, food industry and scientific research laboratories to filter out bacteria and particles, but from There is no report of using this membrane as a battery separator

Method used

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  • Application of mixed cellulose ester film, prepared battery and preparation method
  • Application of mixed cellulose ester film, prepared battery and preparation method
  • Application of mixed cellulose ester film, prepared battery and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The separator of this embodiment is a mixed cellulose ester membrane with a pore size of 0.8 μm and a thickness of 130 μm, and is not infiltrated in the electrolyte containing zinc salt before the battery is assembled.

[0032] The CR2025 button battery is used to assemble the water-based zinc-ion battery for testing. The assembly process is as follows: first place the negative electrode shell, then place the shrapnel and gasket in turn, place the metal zinc sheet as the negative electrode in the middle of the gasket, and mix the cellulose ester film (The pore size is 0.8μm, the thickness is 130μm) is placed on top of the metal zinc sheet, and three drops of electrolyte are added to the membrane. The composition of the electrolyte is 3mol L -1 The zinc trifluoromethanesulfonate aqueous solution, and then the sodium vanadate positive sheet is placed in the middle of the membrane, and finally the positive shell is added to it, and the battery packer is used for sealing. The a...

Embodiment 2

[0034] The separator of this embodiment is a mixed cellulose ester membrane with a pore size of 1.2 μm and a thickness of 130 μm, and it is not infiltrated in the electrolyte containing zinc salt before the battery is assembled.

[0035] The CR2025 button battery is used to assemble the water-based zinc-ion battery for testing. The assembly process is as follows: first place the negative electrode shell, then place the shrapnel and gasket in turn, place the metal zinc sheet as the negative electrode in the middle of the gasket, and mix the cellulose ester film (The pore size is 1.2μm, the thickness is 130μm) is placed on top of the metal zinc sheet, and three drops of electrolyte are added to the membrane. The composition of the electrolyte is 3mol L -1 The zinc trifluoromethanesulfonate aqueous solution, and then the sodium vanadate positive sheet is placed in the middle of the membrane, and finally the positive shell is added to it, and the battery packer is used for sealing. Th...

Embodiment 3

[0037] The separator in this embodiment is a mixed cellulose ester membrane with a pore size of 2.0 μm and a thickness of 130 μm, and it is not infiltrated in the electrolyte containing zinc salt before the battery is assembled.

[0038] The CR2025 button battery is used to assemble the water-based zinc-ion battery for testing. The assembly process is as follows: first place the negative electrode shell, then place the shrapnel and gasket in turn, place the metal zinc sheet as the negative electrode in the middle of the gasket, and mix the cellulose ester film (The pore size is 2.0μm, the thickness is 130μm) is placed on top of the metal zinc sheet, and three drops of electrolyte are added on the membrane. The composition of the electrolyte is 3mol L -1 The zinc trifluoromethanesulfonate aqueous solution, and then the sodium vanadate positive sheet is placed in the middle of the membrane, and finally the positive shell is added to it, and the battery packer is used for sealing. Th...

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Abstract

The invention discloses the application of a mixed cellulose ester film, a prepared battery and a preparation method. The film shows very excellent electrochemical performance as a diaphragm of an aqueous zinc-ion battery. And under the large current density of 5A g<-1>, the capacity retention ratio is still as high as 91.8% after circulation for 4000 circles, and the coulombic efficiency is closeto 100%. The novel diaphragm provided by the invention can greatly prolong the cycle life of the aqueous zinc-ion battery and improve the cycle stability of the aqueous zinc-ion battery, and is beneficial to promoting the development and application of the aqueous zinc-ion battery.

Description

Technical field [0001] The invention belongs to the technical field of batteries, and specifically relates to the application of a novel material mixed cellulose ester film in the preparation of water-based zinc ion batteries. Background technique [0002] Rechargeable batteries are widely used in electric vehicles, smart grids, medical equipment and various portable electronic devices. At present, commercial lithium-ion batteries dominate the battery market due to their high specific energy and long cycle life. However, lithium-ion batteries face high raw material costs, a shortage of lithium resources, and the flammability and ionic conductivity of organic electrolytes. Low-level problems greatly limit the further development of lithium-ion batteries. [0003] Water-based batteries have higher safety performance and lower cost due to the use of salt aqueous solutions as electrolytes, and are considered to be suitable for large-scale and inexpensive energy storage battery systems...

Claims

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Application Information

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IPC IPC(8): H01M2/16H01M10/04H01M10/36H01M10/38
CPCH01M10/0427H01M10/36H01M10/38H01M50/411Y02E60/10Y02P70/50
Inventor 王海燕秦瑶唐有根刘平
Owner CENT SOUTH UNIV
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