Aqueous electrolyte with low dissolved oxygen, preparation method thereof and aqueous ion battery

A water-based electrolyte and electrolyte technology, applied in the direction of aqueous electrolytes, secondary batteries, acidic electrolytes, etc., can solve problems such as poor cycle performance, high proton activity, and limited electrochemical window, and achieve improved discharge performance and simple preparation methods , the effect of reducing energy consumption

Inactive Publication Date: 2022-03-25
浙江金羽新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the main factor affecting the cycle performance of aqueous batteries is the dissolution of electrode materials in the electrolyte, especially in an oxygen environment, the cycle performance is even worse
In addition, the proton activity in the aqueous battery electrolyte is high, and hydrogen evolution oxidation reaction will occur during the application process, so the electrochemical window of the aqueous battery electrolyte will be more obviously limited

Method used

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  • Aqueous electrolyte with low dissolved oxygen, preparation method thereof and aqueous ion battery
  • Aqueous electrolyte with low dissolved oxygen, preparation method thereof and aqueous ion battery
  • Aqueous electrolyte with low dissolved oxygen, preparation method thereof and aqueous ion battery

Examples

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Embodiment 1

[0058] A water-based electrolyte, including a solvent, a solute, and an oxygen-scavenging synergist. The solvent is water or a mixed solution of water and an organic solvent, and the organic solvent is methanol, ethanol, ethylene glycol, formamide, dimethylformamide, acetamide, dimethyl sulfoxide, dimethyl sulfone, One or more of acetonitrile, the volume fraction of water in the solvent is not less than 50%, such as 50%, 60%, 85%, 100%. Described solute comprises one or more in lithium salt, sodium salt and zinc salt, and the anion of described solute comprises sulfate ion, nitrate ion, acetate ion, trifluoromethanesulfonate, methanesulfonate ion, bis One or more of (trifluoromethanesulfonic acid) imide ions; the lithium salt is lithium sulfate, lithium nitrate, lithium acetate, lithium trifluoromethanesulfonate, lithium methanesulfonate, bis(trifluoromethane One or more of lithium sulfonate) imides; the sodium salt is sodium sulfate, sodium nitrate, sodium acetate, sodium tr...

Embodiment 2

[0070] A kind of preparation method of the aqueous electrolyte of low dissolved oxygen, comprises the following steps:

[0071] S1, dissolving the solute in the solvent, the molar concentration of the solute in the aqueous electrolyte is 1-9 mol / L;

[0072] S2. Mixing and dissolving the oxygen-scavenging synergist and the solute simultaneously to form a solution, or dissolving the solute first, and then dissolving the oxygen-scavenging synergist to form a solution;

[0073]S3. Stand or stir the solution described in S2 under sealed conditions for 1-24 hours, preferably 1-6 hours. When the measured free oxygen content in the solution is lower than 1 mg / L, the configuration of the aqueous electrolyte is completed.

Embodiment 3

[0075] A water-based ion battery includes a water-based lithium-ion battery, a water-based sodium-ion battery, and a water-based zinc-ion battery. The water-based ion battery includes a positive pole, a negative pole and the water-based electrolyte described in Example 1.

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Abstract

The invention provides an aqueous electrolyte with low dissolved oxygen, a preparation method thereof and an aqueous ion battery containing the electrolyte. The aqueous electrolyte contains a deoxidizing synergist with chemical reducibility, and the deoxidizing synergist comprises one or more of an electrolyte salt, a hydroxylamine compound and a phenol compound. The deoxidizing synergist can be subjected to an oxidation-reduction reaction with free oxygen in the electrolyte, so that the effect of reducing the content of the free oxygen in the electrolyte is achieved, the pH value of the electrolyte can be adjusted, the hydrogen evolution side reaction is inhibited, and an electrode is protected. The aqueous electrolyte can be applied to aqueous lithium ion batteries, aqueous sodium ion batteries, aqueous zinc ion batteries and the like.

Description

technical field [0001] The invention relates to the technical field of secondary batteries, in particular to a low dissolved oxygen aqueous electrolyte, a preparation method thereof and an aqueous ion battery containing the electrolyte. Background technique [0002] Aqueous batteries are a type of battery system that uses an aqueous solution of neutral salt as the electrolyte. Aqueous batteries have high cycle life, environmental friendliness, high ionic conductivity, and nonflammability, and are suitable for energy storage devices, especially large-scale electric energy storage devices. With the improvement of people's requirements for the safety and environmental protection of power batteries in recent years, water-based batteries have also received more attention. Compared with the organic electrolyte, the aqueous electrolyte used in the aqueous battery has the advantages of non-toxic, non-flammable, low cost and low requirements on the production environment, and the io...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/36
CPCH01M10/38H01M10/36H01M2300/0005H01M2300/0008H01M2300/0011Y02E60/10Y02P70/50
Inventor 黄杜斌刘兴坤杨扬王春源何鑫魏海旭李爱军
Owner 浙江金羽新能源科技有限公司
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