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Sulfonic acid group functionalized siloxy alkene for zinc-based flow battery and preparation method of sulfonic acid group functionalized siloxy alkene

A sulfonic acid group, siloxane technology, applied in hydrogenated silicon, battery electrodes, regenerative fuel cells, etc., to promote uniform deposition performance, inhibit dendrite growth and accumulation problems, improve Coulomb efficiency and cycle stability. Effect

Active Publication Date: 2022-07-01
浙江大学温州研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prepared sulfonated siloxene nanomaterials have a high grafting rate of functionalized groups and good stability, which greatly inhibits the side reactions of zinc dendrites, hydrogen evolution and passivation, and effectively solves the problem of current zinc-based flow batteries. the problem we are facing

Method used

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  • Sulfonic acid group functionalized siloxy alkene for zinc-based flow battery and preparation method of sulfonic acid group functionalized siloxy alkene
  • Sulfonic acid group functionalized siloxy alkene for zinc-based flow battery and preparation method of sulfonic acid group functionalized siloxy alkene
  • Sulfonic acid group functionalized siloxy alkene for zinc-based flow battery and preparation method of sulfonic acid group functionalized siloxy alkene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Weigh 2g CaSi 2 As the silicide raw material powder, it was placed in a 500ml orange cap bottle.

[0046] (2) Take 100ml of concentrated hydrochloric acid (mass fraction 36%-38%) and add it to the orange cap bottle in (1) to obtain a green turbid solution, and place the solution in a -10°C ethanol bath to pre-cool to -10°C.

[0047] (3) The turbid solution in (2) was pre-cooled to -10°C, and the sonicator was used to assist the reaction. The ultrasonic power was 300W, the reaction time was 48h, and the temperature of the reaction solution was maintained at -10°C.

[0048] (4) Vacuum filtration of the turbid solution in (3) to collect gray wet powder to obtain siloxene nanosheets with good morphology.

[0049] (5) Pre-prepared concentration in absolute ethanol solvent is 0.5mol L -1 sulfanilic acid solution.

[0050] (6) Add the wet powder collected in (4) into 30 ml of the ethanolic solution of sulfonic acid amine prepared in (5), ultrasonically assisted dispersi...

Embodiment 2

[0060] Take the same steps as Example 1 to prepare sulfonic acid group-functionalized siloxane, except that 100 ml of concentrated hydrochloric acid in step (2) of Example 1 is replaced with 50 ml of phosphoric acid solution (85 wt.% in H 2 0), other reaction conditions were not changed.

[0061] The TEM characterization showed that the thickness of the siloxene nanosheets was significantly higher than that of the siloxyene nanosheets prepared in Example 1, which indicated that phosphoric acid was used as a topological solvent and oxidant to exfoliate CaSi. 2 The efficiency is lower than that of hydrochloric acid as the topochemical solvent and oxidant to exfoliate CaSi 2 , but it can also be seen from the TEM picture that phosphoric acid also successfully decomposes the layered dense structure of CaSi 2 The siloxene nanosheets exfoliated into independent sheet-like structures indicate that phosphoric acid is also a suitable topochemical solvent and oxidant.

Embodiment 3

[0063] Take the same steps as in Example 1 to prepare sulfonic acid group-functionalized siloxane, the difference is: 0.5mol L in step (5) of Example 1 -1 The sulfanilic acid solution was replaced with 0.5 mol L -1 of poly(4-styrenesulfonic acid) solution, and other reaction conditions were not changed.

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Abstract

The invention discloses sulfonic acid group functionalized silylene for a zinc-based flow battery and a preparation method of the sulfonic acid group functionalized silylene, and belongs to the technical field of preparation of battery electrode materials. The preparation method comprises the following steps: efficiently stripping a silicide raw material calcium silicide in a topological chemical solvent of monobasic or polybasic acid and an oxidizing agent through a topological chemical method to obtain the siloxyalkene nanosheet, and further performing sulfonic acid group functional modification on the siloxyalkene nanosheet by using a sulfonic acid grafting agent to obtain the high-quality sulfonated siloxyalkene nanosheet. The zinc-based flow battery negative electrode coated with the sulfated siloxy alkene can effectively solve the problems of zinc dendrite growth, accumulation and the like, stable and uniform low-overpotential zinc deposition / stripping is realized, and the development of further commercial application of the zinc-based flow battery is promoted.

Description

technical field [0001] The invention belongs to the technical field of battery electrode material preparation, and relates to a sulfonic acid group-functionalized siloxyene used in a zinc-based liquid flow battery and a preparation method thereof. The use of sulfonated siloxyene / zinc composite foil for the negative electrode of zinc-based flow batteries can solve the serious problems of zinc dendrite growth, accumulation, hydrogen evolution and dead zinc in current zinc-based flow batteries during charging and discharging. , which promotes the practical application of zinc-based flow batteries with high Coulombic efficiency and stable performance for distributed energy storage systems, demonstrating the great potential of zinc-based flow batteries in the field of energy storage. Background technique [0002] With the continuous consumption of non-renewable energy such as fossil energy, the social environment and energy problems have become increasingly prominent, and the pro...

Claims

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Application Information

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IPC IPC(8): C01B33/04H01M4/88H01M8/18
CPCC01B33/04H01M4/8828H01M8/188C01P2004/03C01P2004/04C01P2006/40H01M2004/8684Y02E60/50
Inventor 汪洋叶志镇黄靖云罗斌
Owner 浙江大学温州研究院
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