Deprotonated dopamine-coated film and preparation method and application thereof

A deprotonation and dopamine technology, applied in the direction of separators/films/diaphragms/spacers, electrochemical generators, structural parts, etc. The effect of enhanced battery cycle performance, improved selective permeability, and improved rate capability

Active Publication Date: 2016-06-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the battery rate performance of polydopamine modified battery separator still needs to be improved

Method used

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  • Deprotonated dopamine-coated film and preparation method and application thereof
  • Deprotonated dopamine-coated film and preparation method and application thereof
  • Deprotonated dopamine-coated film and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] First, take 0.9g of Tris (Tris) and dissolve it in a mixed solvent of methanol and water (volume 150ml, volume ratio 1:1), then add a certain concentration of hydrochloric acid dropwise until the pH of the mixture is 8.5, and then add 0.3 g of dopamine hydrochloride, stirred and dissolved. Finally, several pieces of polyethylene film prewashed with deionized water were immersed in the mixed solution for 24h. The resulting treated diaphragm was rinsed with deionized water several times, and dried in a vacuum oven at 60° C. for 6 hours to obtain a dopamine-coated modified polyethylene film. Its scanning electron microscope image is figure 1 As shown, it can be seen that there is a uniform coating of dopamine on the surface of the polyethylene film.

Embodiment 2

[0032] The method described in Example 1 was used to prepare a dopamine-coated modified polyethylene film. A lithium hydroxide solution with a pH of 13 was prepared, and the dopamine-coated polyethylene film was soaked in it for 0.5 hours, then taken out, rinsed with deionized water several times, and dried in a vacuum oven at 60°C for 6 hours. Its scanning electron microscope image is figure 2 As shown, it can be seen that after the deprotonation treatment, the dopamine coating is slightly peeled off, but the whole remains intact.

Embodiment 3

[0034] The method described in Example 1 was used to prepare a dopamine-coated modified polypropylene film. A sodium hydroxide solution with a pH of 12 was prepared, and the dopamine-coated polypropylene film was soaked in it for 1 hour, then taken out, rinsed with deionized water several times, and dried in a vacuum oven at 60°C for 6 hours.

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Abstract

The invention discloses a deprotonated dopamine-coated film and a preparation method and application thereof. The preparation method of the deprotonated dopamine-coated film includes coating the polymer film matrix surface with dopamine monomers in a buffer solution by oxidization and self polymerization so as to form a uniform coating layer, soaking the uniform coating layer in an alkaline solution and removing protons of functional groups such as a phenolic hydroxyl group and carboxyl on the surface of the coating layer, namely deprotonating. The film modified by the preparation method is of low impedance and high ionic conductivity. Owing to deprotonation, initial charge-discharge efficiency and coulombic efficiency of batteries are improved remarkably, and battery cycle performance is enhanced.

Description

technical field [0001] The invention relates to the field of battery diaphragm preparation, in particular to a deprotonated dopamine-coated film, a preparation method and application thereof. Background technique [0002] The separator is an important part of the lithium battery structure, and its performance directly affects the capacity and cycle performance of the corresponding battery. The main application of battery separators in the market today is mainly polyolefin films, but in view of problems such as product consistency, the supply of domestic power battery separators is monopolized by foreign high-end separator manufacturers. Therefore, it is necessary to develop a battery separator with independent property rights and excellent performance. [0003] Polyolefin film has always been the leading role in the battery separator market because of its high porosity, low resistance, strong acid and alkali resistance and good tear strength. However, its affinity to the e...

Claims

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Application Information

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IPC IPC(8): H01M2/14H01M2/16H01M10/0525H01M50/403H01M50/411H01M50/449H01M50/489
CPCH01M10/0525H01M50/40H01M50/409H01M50/403H01M50/411H01M50/449Y02E60/10
Inventor 冯金奎张震
Owner SHANDONG UNIV
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