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Zeolite molecular sieve nanosheet-loaded porous membrane, preparation method and application of zeolite molecular sieve nanosheet-loaded porous membrane in zinc-based flow battery

A zeolite molecular sieve and nanosheet technology, which is applied in the field of porous membranes, can solve the problems of poor durability, membrane damage to battery performance, and easy peeling of two-dimensional nanosheet material layers, so as to prolong the cycle life, promote uniform deposition, and achieve excellent battery performance. performance effect

Active Publication Date: 2022-06-21
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: during the charging and discharging process of the zinc-based flow battery, due to the formation of zinc dendrites, the surface of the mesoporous membrane is deposited, the membrane is damaged, and the performance of the battery is reduced; The two-dimensional nanosheet material layer obtained by thermal generation is easy to peel off and has poor durability

Method used

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  • Zeolite molecular sieve nanosheet-loaded porous membrane, preparation method and application of zeolite molecular sieve nanosheet-loaded porous membrane in zinc-based flow battery
  • Zeolite molecular sieve nanosheet-loaded porous membrane, preparation method and application of zeolite molecular sieve nanosheet-loaded porous membrane in zinc-based flow battery
  • Zeolite molecular sieve nanosheet-loaded porous membrane, preparation method and application of zeolite molecular sieve nanosheet-loaded porous membrane in zinc-based flow battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Preparation of MFI type zeolite molecular sieve nanosheets

[0051] In this patent, it can be prepared according to the existing method (non-patent literature 2), and the MFI type zeolite molecular sieve nanosheet (ns-MFI) is prepared by a bottom-up direct synthesis method, which has a nearly Cylindrical (0.56 x 0.53 nm) straight channels.

[0052] Non-Patent Document 2: M.Y.Jeon, D.Kim, P.Kumar, P.S.Lee, N.Rangnekar, P.Bai, M.Shete, B.Elyassi, H.S.Lee, K.Narasimharao, S.N.Basahel, S.Al-Thabaiti ,W.Xu,H.J.Cho,E.O.Fetisov,R.Thyagarajan,R.F.DeJaco,W.Fan,K.A.Mkhoyan,J.I.Siepmann,M.Tsapatsis,Ultra-selective high-flux membranes from directly synthesizedzeolite nanosheets.Nature 543,620-179 ).

Embodiment 2

[0053] The preparation of embodiment 2 sulfonated polyether ketones

[0054] Sulfonated polyetherketone (SPEEK) is prepared by direct sulfonation of PEEK with sulfuric acid (98%) at 50° C. for 5 h (Non-Patent Document 3). pass 1 As determined by H NMR, the sulfonation degree (DS) of the prepared SPEEK is about 67%.

[0055] Non-Patent Document 3: J.Xi, Z.Li, L.Yu, B.Yin, L.Wang, L.Liu, X.Qiu, L.Chen Effect of degree of sulfonation and casting solvent on sulfonated poly(ether etherketone) membrane for vanadium redox flow battery J.Power Sources,285(2015),pp.195-204,10.1016 / j.jpowsour.2015.03.104.

Embodiment 3

[0056] The preparation of embodiment 3 porous film

[0057] The ns-MFI-P / S membrane was prepared by phase inversion method. Add polyethersulfone (PES), sulfonated polyetherketone (SPEEK) and the MFI type zeolite molecular sieve nanosheets (ns-MFI) prepared in Example 1 to the solvent DMAc in sequence, then ball mill the mixture and ultrasonically treat it, It is then left to defoam to form a homogeneous cast solution. The total polymer concentration of the casting solution is 35wt%, of which SPEEK accounts for 20wt%, the contents of ns-MFI are respectively 5wt%, 7wt% and 10wt%, and the rest is PES.

[0058] The casting solution was poured onto a flat glass plate and the film was prepared at room temperature using a flat film casting apparatus. The glass plate was then immersed in water until the film peeled off automatically after the phase inversion. The obtained film was soaked in isopropanol for 30 minutes, and then evaporated at room temperature for 2 hours to ensure th...

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Abstract

The invention provides a zeolite molecular sieve nanosheet-loaded porous membrane, a preparation method and application of the zeolite molecular sieve nanosheet-loaded porous membrane in a zinc-based flow battery, and belongs to the technical field of flow batteries. MFI type zeolite molecular sieve nanosheets (ns-MFI) with high mechanical strength and hydrophobicity are introduced into a porous polymer film in situ, and a turned scale-shaped structure is formed through a one-step phase inversion / surface segregation process, so that mechanical energy can be well dispersed, and an effective protection characteristic is provided for the film to resist piercing of zinc dendrites. Hydrophobicity of the zinc oxide can effectively relieve water migration and accelerate diffusion of zincate ions on an electrode-membrane interface, so that uniform deposition of zinc on an electrode is promoted, and the cycle life of a battery is prolonged. Besides, the ns-MFI with rich sub-nano-sized pores provides additional ion screening capability for the membrane, and the high aspect ratio of the ns-MFI provides additional transmission area for charge balance ions OH <->, so that the membrane shows excellent battery performance.

Description

technical field [0001] The invention relates to a porous membrane loaded with zeolite molecular sieve nanosheets, a preparation method and its application in zinc-based flow batteries, belonging to the technical field of flow batteries. Background technique [0002] Energy storage technologies including pumped hydro storage, compressed air energy storage and electrochemical energy storage are increasingly required to improve the efficiency of renewable energy utilization. Among them, flow batteries are considered to be one of the most suitable electrochemical energy storage technologies for large-scale energy storage. In particular, the emerging aqueous zinc-based flow batteries (ZFBs) have attracted extensive interest from researchers in recent years due to their advantages such as high energy density, long cycle life, safety and environmental protection. However, the uneven galvanization / stripping process during charge-discharge cycling can lead to severe dendrite problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/1041H01M8/1067H01M8/1081H01M8/1086H01M8/18
CPCH01M8/1041H01M8/1067H01M8/1081H01M8/1086H01M8/188Y02E60/50
Inventor 徐至黄康侯晓璇
Owner NANJING UNIV OF TECH