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Recyclable and charge-modified mesoporous nanocellulose paper-based zinc ion battery diaphragm

A nanocellulose, zinc-ion battery technology, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of uneven zinc deposition, uneven pore distribution, battery short circuit, etc., to improve battery performance, improve performance, the effect of enhancing battery life

Pending Publication Date: 2022-07-01
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Problems in the current separator: uneven pore distribution, resulting in uneven zinc deposition; zinc dendrites produced by the "tip effect", which will penetrate the separator and cause a short circuit in the battery

Method used

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  • Recyclable and charge-modified mesoporous nanocellulose paper-based zinc ion battery diaphragm
  • Recyclable and charge-modified mesoporous nanocellulose paper-based zinc ion battery diaphragm
  • Recyclable and charge-modified mesoporous nanocellulose paper-based zinc ion battery diaphragm

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of Mesoporous Nanocellulose Paper-Based Zn-ion Battery Separator

[0034] Weigh 150mg of cellulose 350 watts for ultrasonic dispersion, build a suction filtration device, use a nylon filter membrane to form a membrane, heat and dry at 55 ° C for 24 hours, and peel off successfully to obtain an untreated original cellulose diaphragm, measured The thickness is 60 microns.

Embodiment 2

[0036] Preparation of Negatively Charged Modified Mesoporous Nanocellulose Paper-Based Zinc-ion Battery Separator

[0037] Weigh 100 mg of sulfuric acid-treated negatively-charged cellulose for 300-watt ultrasonic dispersion, build a suction filtration device, use a nylon filter membrane to form a membrane, heat and dry at 60 °C for 12 hours, and peel off successfully to obtain sulfuric acid-modified negative cellulose. Charged cellulose separator, measured to be 30 microns thick.

Embodiment 3

[0039] Preparation of positively charged mesoporous nanocellulose paper-based separators for zinc-ion batteries

[0040] Weigh 100 mg of quaternary ammonium salt-treated positively charged cellulose for 300-watt ultrasonic dispersion, build a suction filtration device, use a nylon filter membrane to form a membrane, heat and dry at 60 ° C for 12 hours, and peel off successfully to obtain quaternary ammonium Salt-treated positively charged separator, measured to be 31 microns thick.

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Abstract

The invention provides a recyclable charge-modified mesoporous nanocellulose paper-based zinc ion battery diaphragm, which is prepared by the following steps: treating nanocellulose by adopting a simple process, weighing a certain mass of seaweed nanocellulose powder, putting the seaweed nanocellulose powder into water, performing ultrasonic dispersion to obtain a uniform cellulose suspension, performing suction filtration, and drying to obtain the charge-modified mesoporous nanocellulose paper-based zinc ion battery diaphragm. The original cellulose diaphragm is obtained; the seaweed nanocellulose diaphragm has a very small pore size, different substances are used for charge modification on the basis, and compared with a negative charge diaphragm, the obtained positive charge diaphragm is more favorable for improving the cycle performance of the battery; the preparation process is simple, the material source is rich, no pollution is caused to the environment, the battery performance can be greatly improved, compared with an existing common diaphragm, the diaphragm is lighter and thinner and has better mechanical strength, and more space and capacity are reserved for a positive electrode and a negative electrode; according to the invention, the unique effect of the surface charge in the aqueous battery is explored, and the stability and the rate characteristic of the zinc ion battery are greatly improved.

Description

technical field [0001] The invention relates to an aqueous zinc battery, in particular to a recyclable, charge-modified, mesoporous nanocellulose paper-based zinc-ion battery separator. Background technique [0002] Aqueous zinc-ion batteries have low cost, high safety and high theoretical volume capacity, and have good application prospects in modern society. Therefore, the development of zinc-ion batteries has received extensive attention and is a new generation of batteries with great potential. However, the life of zinc-ion batteries is limited by the growth of zinc dendrites and internal side reactions of the battery, and these problems are yet to be solved. [0003] The battery is mainly composed of four parts. As an important part, the separator plays the role of separating the positive and negative electrodes and allowing ions to pass through freely. At present, the common separators used in zinc-ion batteries are glass fiber or filter paper; the glass fiber separat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M50/403H01M50/411H01M50/449H01M50/491H01M10/36
CPCH01M50/403H01M50/411H01M50/449H01M50/491H01M10/36
Inventor 汪朝晖张湘妮杨善辰
Owner HUNAN UNIV
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