A kind of high concentration solution and its application and preparation method

A high-concentration, solution-based technology, used in electrical components, electrochemical generators, aqueous electrolytes, etc.

Active Publication Date: 2021-07-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the use of "water-in-salt" electrolytes can effectively increase the energy density of aqueous electrochemical energy storage devices, most of these electrolytes are based on expensive organic lithium salts.

Method used

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  • A kind of high concentration solution and its application and preparation method
  • A kind of high concentration solution and its application and preparation method
  • A kind of high concentration solution and its application and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028](1) Add 0.3375 mol of zinc chloride and 0.1125 mol of zinc bromide to 10 g of deionized water in sequence, and then heat at 60°C for 2 hours to obtain ZnCl 2 , ZnBr 2 White turbid liquid composed of water. Add 0.01mol zinc acetate, continue heating in an oven at 120°C for 2 hours, and cool naturally to obtain a total concentration of 46mol kg -1 Zinc chloride-zinc bromide-zinc acetate salt-water "copolymer" solution in which the molar ratio of bromide ions to chloride ions is 1:3, see figure 2 .

[0029] (2) The zinc negative electrode, the glass fiber separator soaked in the electrolyte solution in (1) and the graphene film positive electrode are sequentially stacked into the battery mold and heat-sealed under pressure.

[0030] The battery cell obtained through the above steps, at 1A g -1 Under the current density, its discharge specific capacity is 607.5mAhg -1 (Based on the calculation of the positive active material, see image 3 ), and has excellent cycle st...

Embodiment 2

[0039] (1) Add 0.28 mol of zinc chloride and 0.14 mol of zinc bromide to 10 g of deionized water in sequence, and then heat at 40°C for 24 hours to obtain ZnCl 2 , ZnBr 2 White turbid liquid composed of water. Add 0.01mol zinc acetate, continue heating in an oven at 100°C for 10h, and cool naturally to obtain a total concentration of 43mol kg -1 Zinc chloride-zinc bromide-zinc acetate salt-water "copolymer" solution in which the molar ratio of bromide ions to chloride ions is 1:2, see Figure 5 .

[0040] (2) The graphene fiber non-woven fabric negative electrode substrate, the glass fiber separator soaked in the electrolyte solution in (1) and the expanded graphite positive electrode are sequentially stacked into the battery mold and heat-sealed under pressure.

[0041] The battery cell obtained through the above steps, at 1A g -1 Under the current density, its discharge specific capacity is 632mAhg -1 (calculated based on the positive active material), and has good cycl...

Embodiment 3

[0044] (1) Add 0.245mol of zinc chloride and 0.245mol of zinc bromide to 10g of deionized water in sequence, and then heat at 100°C for 2h to obtain ZnCl 2 , ZnBr 2 White turbid liquid composed of water. Add 0.05mol zinc acetate, continue heating in an oven at 120°C for 72 hours, and cool naturally to obtain a total concentration of 50mol kg -1 Zinc chloride-zinc bromide-zinc acetate salt-water "copolymer" solution in which the molar ratio of bromide ions to chloride ions is 1:1, see Figure 6 .

[0045] (2) The carbon cloth negative electrode substrate, the glass fiber separator soaked in the electrolyte in (1), and the mesophase microsphere graphite positive electrode are sequentially stacked into the battery mold and sealed under pressure.

[0046] The battery cell obtained through the above steps, at 1A g -1 Under the current density, its discharge specific capacity is 637mAhg -1 (calculated based on the positive active material), and has good cycle stability, and the...

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Abstract

The present invention provides a high-concentration solution, which is suitable for electrolyte. The solution contains at least zinc ions, bromide ions and chloride ions. Through the action of "multi-salt co-dissolution", a new "salt-dissolving mixture" is formed, which greatly increases the concentration of the solution. . Further, the present invention also provides an ultra-high concentration solution, which also contains zinc acetate. Through the "end-capping" effect of zinc acetate, the salt cannot continue to aggregate and grow, and then it becomes an inorganic oligomer with a larger molecular weight and stably exists. In solution, its concentration can even reach 45mol kg ‑1 . The high concentration of electrolyte not only effectively inhibits the electrolysis of water, but also reduces the oxidation potential of bromide ions, which further promotes the intercalation of bromine in the battery cathode material, and greatly improves the specific capacity of the cathode (~638mAh g) ‑1 ). Moreover, the increase of the active ion concentration of the electrolyte can reduce the amount of the electrolyte, which is beneficial to the improvement of the energy density of the non-rocking-chair battery.

Description

technical field [0001] The invention relates to a high-concentration solution and its application in water-based dual-ion batteries. The concentration of the solution can reach 30mol kg -1 Above, can greatly promote the specific capacity of the battery. Background technique [0002] Due to the rapid development of renewable energy technologies in recent years, the demand for grid-scale energy storage is growing. Although lithium-ion batteries dominate the electrochemical energy storage market including applications such as portable electronic devices and electric vehicles due to their high energy density, considering the natural abundance and uneven distribution of natural lithium resources, it is Grid energy storage at the gigawatt level is unreasonable, and it will also bring about higher costs. Aqueous electrochemical energy storage devices are not only cheap, but also extremely safe, providing a solution for large-scale storage of renewable energy. [0003] However, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0005Y02E60/10
Inventor 高超蔡盛赢
Owner ZHEJIANG UNIV
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