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Water solution electrolyte for widening decomposition voltage

A technology for decomposing voltage and aqueous solution, applied in aqueous electrolytes, circuits, electrical components, etc., can solve the problems of inability to reduce the solubility of electrode materials, inability to widen the decomposition voltage of aqueous solutions, and broaden the decomposition voltage of electrolytes, so as to improve electrochemical performance, reduce Solubility, reducing activity

Active Publication Date: 2018-08-21
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The currently reported aqueous electrolytes are basically unable to broaden the decomposition voltage of the electrolyte and improve the stability of the electrode in the electrolyte.
Common methods, such as adjusting the pH value of the aqueous solution, can reduce the solubility of the electrode material in the aqueous solution, but cannot widen the decomposition voltage of the aqueous solution; adding a certain surfactant in the electrolyte can improve the hydrogen evolution or the evolution of hydrogen to a certain extent. Oxygen overpotential, but cannot reduce the solubility of electrode materials in aqueous solution

Method used

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  • Water solution electrolyte for widening decomposition voltage
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Effect test

Embodiment 1

[0017] Weigh 80mmol NaClO 4 and 4mmol Zn(CF 3 SO 3 ) 2 Dissolve in deionized water, and then use a volumetric flask to configure the solution to 8mol / L NaClO 4 +0.4mol / L Zn(CF 3 SO 3 ) 2 The aqueous solution, obtains a kind of aqueous solution electrolyte with wide decomposition voltage described in the present embodiment 1. The prepared 8mol / L NaClO 4 +0.4mol / L Zn(CF 3 SO 3 ) 2 The aqueous solution is the electrolyte, the titanium mesh is the working electrode, the zinc sheet is the reference electrolysis and the counter electrode, and the button cell is assembled to test its electrochemical performance. The cyclic voltammetry curve is as follows: figure 1 shown. figure 1 It is shown that the prepared aqueous electrolyte has a decomposition voltage of 2.5V. The cathode material (such as Na 3 V 2 (PO 4 ) 2 f 3 material) charged to a certain voltage (such as 1.7V and 1.9V, then 1.6V and 0.8V), put it in the electrolyte, and observe the change of the electrolyte...

Embodiment 2

[0019] Weigh 90mmol NaCF 3 SO 3 and 1.8mmol Zn(CF 3 SO 3 ) 2 Dissolve in deionized water, and then use a volumetric flask to configure the solution to 9mol / L NaCF 3 SO 3 +0.18mol / L Zn(CF 3 SO 3 ) 2 Aqueous solution, obtain a kind of aqueous solution electrolyte with wide decomposition voltage described in embodiment 2, decomposition voltage can reach 2.7V.

Embodiment 3

[0021] Weigh 80mmol NaClO 4 and 2mmol Zn(ClO 4 ) 2 Dissolve in deionized water, and then use a volumetric flask to configure the solution to 8mol / L NaClO 4 +0.2mol / L Zn(ClO 4 ) 2 The aqueous solution, obtains a kind of aqueous solution electrolyte with wide decomposition voltage described in the present embodiment 3, and decomposition voltage can reach 2.6V.

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Abstract

The invention belongs to the technical field of water solution batteries and discloses a water solution electrolyte for widening decomposition voltage. Concentration of sodium ions in the water solution electrolyte is not lower than 5mol / L, and the decomposition voltage of the water solution electrolyte is higher than 1.23V. By controlling sodium ion concentration in the water solution electrolyte, the electrolyte contains high-concentration sodium ions and can widen the decomposition voltage of the water solution electrolyte and lower solubility of an electrode material in a water solution atthe same time. The electrolyte can be especially used as water-class zinc-based batteries to finally improve energy density and circulating performance of the water-class batteries.

Description

technical field [0001] The invention belongs to the technical field of aqueous solution batteries, and more specifically relates to an aqueous solution electrolyte with a wide decomposition voltage. Background technique [0002] Rechargeable aqueous batteries use cheap, non-flammable, and environmentally friendly aqueous solutions as electrolytes, which have significant cost and safety advantages over non-aqueous batteries in the field of large-scale energy storage. However, limited by the low decomposition voltage of water (theoretical decomposition voltage is 1.23V), the energy density and cycle performance of aqueous batteries are far from satisfactory. Therefore, broadening the decomposition voltage of aqueous electrolytes and reducing the solubility of electrode materials in aqueous solutions are the keys to improving the energy density and cycle performance of aqueous batteries. The aqueous electrolytes reported so far are basically unable to broaden the decomposition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/36
CPCH01M10/36H01M2300/0002Y02E60/10
Inventor 蒋凯李威王康丽程时杰
Owner HUAZHONG UNIV OF SCI & TECH