Electrolyte and application thereof

An electrolyte and electrolyte technology, applied in the field of electrolyte, can solve problems such as limiting the growth of zinc dendrites, increasing zinc, and increasing the performance of the zinc negative electrode interface impedance battery, so as to reduce the nucleation overpotential, inhibit passivation, slow down Effect of formation of by-products such as ZnO

Pending Publication Date: 2022-06-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing research strategies are mainly divided into the following two aspects: on the one hand, increasing the positive potential of zinc precipitation through electrolyte additives (quaternary ammonium salts, organic molecules, metal cations, etc.); Coating with a layer of poorly conductive organic polymers or inorganic particles to limit the growth of zinc dendrites
The above two methods will inevitably increase the interfacial impedance of the zinc anode while stabilizing the zinc anode, thus sacrificing part of the battery performance.

Method used

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  • Electrolyte and application thereof
  • Electrolyte and application thereof
  • Electrolyte and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Preparation of aqueous electrolyte, zinc sulfate (ZnSO 4 ·7H 2 O) is supporting electrolyte, dopamine hydrochloride (DA) is additive, water (H 2 O) is a solvent;

[0047] In the electrolyte, the concentration of zinc sulfate is 2mol L -1 , dopamine hydrochloride 0.1mol L -1 , .

Embodiment 2

[0049] Preparation of aqueous electrolyte, zinc sulfate (ZnSO 4 ·7H 2 O) is supporting electrolyte, dopamine hydrochloride (DA) is additive, water (H 2 O) is a solvent;

[0050] In the electrolyte, the concentration of zinc sulfate is 2mol L -1 , the concentration of dopamine hydrochloride is 0.3mol L -1 .

Embodiment 3

[0052] Preparation of aqueous electrolyte, zinc sulfate (ZnSO 4 ·7H 2 O) is supporting electrolyte, dopamine hydrochloride (DA) is additive, water (H 2 O) is a solvent;

[0053] In the electrolyte, the concentration of zinc sulfate is 2mol L -1 , the concentration of dopamine hydrochloride is 0.5mol L -1 .

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Abstract

The invention discloses an electrolyte and application thereof. The electrolyte comprises an electrolyte, a solvent and an additive, the additive comprises a dopamine compound. When the electrolyte is used as the electrolyte of the aqueous zinc-based battery, the dopamine can regulate and control zinc ion deposition dissolution kinetics, and the zinc ion nucleation overpotential is effectively reduced; meanwhile, in the charging and discharging process of the battery, a polydopamine film layer can be formed on the surface of zinc metal in an in-situ self-polymerization manner, and the effects of preventing passivation corrosion of a zinc negative electrode and stabilizing the zinc deposition and dissolution process are achieved, so that the stability of the zinc negative electrode is improved, and the interface impedance is reduced.

Description

technical field [0001] The application relates to an electrolyte and its application, and belongs to the technical field of zinc-based batteries. Background technique [0002] With the development of smart electronic devices, electric vehicles and other fields, people have higher and higher requirements for energy density, fast charging and discharging performance and safety performance of energy storage devices. Aqueous zinc-based battery is a safe, reliable and environmentally friendly high-efficiency rechargeable battery, because the zinc negative electrode itself has a relatively negative electrode potential (-0.76V relative to the standard hydrogen electrode), multiple electron reactions, and high energy density (820mAh g -1 ), fast kinetics, abundant reserves and low cost, making it one of the first choices for large-scale high-efficiency energy storage technologies. There is no doubt that the zinc anode is an extremely core component in many zinc-based energy storage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36H01M4/62H01M4/42
CPCH01M10/36H01M4/628H01M4/42H01M2300/0091H01M2300/0002H01M2004/027Y02P70/50
Inventor 李先锋常娜娜尹彦斌王胜男张华民
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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