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Aqueous zinc ion battery electrolyte and battery

A technology of zinc-ion batteries and electrolytes, applied in aqueous electrolytes, electrolytes, secondary batteries, etc., can solve problems such as consumption, damage to battery cycle life, shelf life and capacity retention, zinc electrode corrosion, etc.

Pending Publication Date: 2022-04-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the corrosion problem of the zinc electrode cannot be ignored, it will continue to consume the electrolyte and active zinc during the storage and operation of the battery, and damage the cycle life, storage life and capacity retention of the battery

Method used

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  • Aqueous zinc ion battery electrolyte and battery
  • Aqueous zinc ion battery electrolyte and battery
  • Aqueous zinc ion battery electrolyte and battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]The present embodiment provides a kind of preparation method of the electrolytic solution of water system zinc ion battery, and its composition is as follows: zinc sulfate, sodium glutamate and solvent water. The zinc sulfate of 0.2mol and the sodium glutamate of 0.01mol are dissolved in deionized water, and are configured into 100mL electrolyte containing 2mol / L zinc sulfate and 0.1mol / L sodium glutamate.

[0039] Soak the zinc flakes in the electrolyte prepared in this example to observe the corrosion status of the zinc flakes. After soaking for 21 days, the morphology of the surface of the zinc flakes is shown in Figure 1(b). The zinc flakes remain bright and have no by-products, reflecting that the chemical stability of metal zinc in the electrolyte of this example is better. Apply the electrolyte of this example to a zinc-zinc symmetrical button cell, at 5mA / cm 2 The current density and 5mAh / cm 2 The deposition capacity was charged and discharged, and the depositi...

Embodiment 2

[0046] This embodiment provides an aqueous zinc-ion battery, and the positive electrode active material adopts α-MnO 2 . Its preparation method comprises the following steps:

[0047] (1) Preparation of electrolyte: Dissolve 0.2 mol of zinc sulfate and 0.01 mol of sodium glutamate in deionized water to prepare 100 mL of a mixed solution containing 2 mol / L zinc sulfate and 0.1 mol / L of sodium glutamate; Then add 0.02 mol of manganese sulfate into the mixed solution, stir until completely dissolved, and obtain the target electrolyte.

[0048] (2) Preparation of positive electrode sheet:

[0049] α-MnO 2 , Ketjen Black and polytetrafluoroethylene (PTFE) were mixed in a mass ratio of 7:2:1, and isopropanol was used as a solvent. After grinding evenly, they were rolled onto a stainless steel mesh and dried at 70°C for 12 hours to obtain a pole piece with a loading capacity of 3~4mg / cm 2 .

[0050] (3) Assembly of aqueous zinc-ion battery:

[0051] The aqueous zinc-ion batter...

Embodiment 3

[0058] This embodiment provides an aqueous zinc-ion battery, and the positive electrode active material is TCNQ@PPy. Its preparation method comprises the following steps:

[0059] (1) Electrolyte preparation: Dissolve 0.2mol of zinc chloride and 0.01mol of sodium glutamate in deionized water to prepare 100mL of 2mol / L zinc chloride and 0.1mol / L of sodium glutamate electrolyte.

[0060] (2) Polypyrrole coating of TCNQ

[0061] 0.2 g of TCNQ was dispersed in 50 mL of 0.3 M polyvinylpyrrolidone aqueous solution and stirred at room temperature for 1 hour. After centrifugation, disperse in 50mL water, add pyrrole monomer and stir for 0.5 hours, then add ammonium persulfate. Wherein, the mass ratio of TCNQ and pyrrole monomer is 8:1, and the mol ratio of pyrrole and sodium persulfate is 1:1. The solution was stirred at 0 °C for 12 hours. The resulting precipitate was collected by centrifugation, washed with water several times and dried at 70 °C to obtain the TCNQ@PPy material....

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Abstract

The invention provides an aqueous zinc ion battery electrolyte and a battery, and belongs to the field of aqueous zinc ion batteries, the aqueous zinc ion battery electrolyte comprises sodium glutamate, zinc salt and water, the concentration of the sodium glutamate in the aqueous zinc ion battery electrolyte is 0.01 mol / L-0. 5mol / L, preferably 0.1 mol / L-0. 5mol / L, and the concentration of the zinc salt in the aqueous zinc ion battery electrolyte is 0.01 mol / L-0. 5mol / L, preferably 0.1 mol / L-0. 5mol / L, preferably 0.1 mol / L-0. 5mol / L; the zinc salt is selected from one or more of zinc sulfate, zinc chloride, zinc nitrate, zinc acetate, zinc perchlorate, zinc tetrafluoroborate and zinc trifluoromethanesulfonate, and the concentration of the zinc salt in the aqueous zinc ion battery electrolyte is 1.5 mol / L to 2.5 mol / L. The invention also provides an aqueous zinc ion battery which comprises a positive electrode, a negative electrode and an electrolyte, and the electrolyte is the aqueous zinc ion battery electrolyte. The problems of corrosion and zinc dendritic crystals of the zinc negative electrode are effectively solved, the cycling stability can be remarkably improved, and the cycling life can be remarkably prolonged.

Description

technical field [0001] The invention belongs to the field of water-based zinc-ion batteries, and more specifically, relates to a water-based zinc-ion battery electrolyte and a battery. Background technique [0002] The development of renewable energy urgently requires the development of high-safety, low-cost, and long-life large-scale energy storage technologies. Lithium-ion batteries are electrochemical energy storage devices widely used in portable electronic products and electric vehicles, and have the characteristics of high energy density and good cycle stability. However, the shortage of lithium resources and the flammability of organic electrolytes pose many economic challenges and safety hazards, limiting their application in large-scale energy storage. Therefore, it is urgent to explore other alternative battery systems. [0003] Aqueous zinc-ion battery is a new type of secondary battery developed in recent years, which has attracted extensive attention due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002H01M2300/0091
Inventor 沈越钟芸黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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