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Aqueous alkaline electrolyte and preparation method thereof

An electrolyte and alkaline technology, which is applied in the field of water-based alkaline electrolyte and its preparation, can solve the problems of electrolyte volatilization, easy crystallization, and affecting the service life of sensors, and achieve the effect of avoiding volatilization and moderate viscosity

Active Publication Date: 2021-07-16
南京艾伊科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The performance of the battery electrolyte determines the energy storage and energy density of the battery system, and long-term battery storage will cause the electrolyte to volatilize, crystalline solids to block various pores, and metal electrodes to be corroded, which will affect the service life of the battery
The existing electrochemical oxygen sensor has problems such as severe electrolyte volatilization and easy crystallization to block various pores during use.
For example, the low-viscosity electrolyte used in the lead-containing electrochemical oxygen sensor volatilizes seriously in a high-temperature and low-humidity environment, which affects the service life of the sensor; while the high-viscosity electrolyte affects the ion transmission speed in the internal circuit, greatly prolonging the response time of the sensor
In order to avoid volatilization, some electrochemical sensors add agar, sodium polyacrylate and other additives to the acid electrolyte to increase the viscosity of the electrolyte and reduce the volatilization speed of the sensor in a high temperature and low humidity environment. Immersed in acidic electrolyte, its chemical corrosion rate is much higher than that in alkaline electrolyte, and the lead oxide produced by chemical corrosion will accumulate on the lead electrode, which will slow down or even stop the electrochemical reaction rate and shorten the sensor service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] A water-based alkaline electrolyte, comprising the following raw materials in parts by weight: 150 kg of water, 100 kg of weakly alkaline salt, and 0.5 kg of a thickener;

[0040] The weakly basic salt is: potassium acetate;

[0041] The thickener is sodium polyacrylate.

[0042] The preparation method of described aqueous alkaline electrolyte, comprises the following steps:

[0043] (1) Dissolving the weakly basic salt in water, and stirring and mixing evenly to obtain a weakly basic salt solution;

[0044] (2) adjust the pH of the weakly alkaline saline solution to be 8.5-9.5;

[0045] (3) After stirring and mixing, add a thickener to the solution obtained in step (2), and stir and mix evenly to obtain the aqueous alkaline electrolyte.

Embodiment 2

[0047] A water-based alkaline electrolyte, comprising the following raw materials in parts by weight: 300 kg of deionized water, 200 kg of weakly alkaline salt, and 1 kg of thickener;

[0048] The weakly basic salt is: potassium acetate;

[0049] The thickener is: sodium polyacrylate.

[0050] The preparation method of described aqueous alkaline electrolyte, comprises the following steps:

[0051] Dissolve potassium acetate in water, and stir to mix evenly to obtain weakly alkaline saline solution;

[0052] Its chemical formula is: CH3COOK=CH3COO-+K+

[0053] The chemical equation for further hydrolysis of acetate ion is:

[0054] CH3COO-+H2O≒CH3COOH+OH-

[0055] Potassium acetate is dissolved in water and undergoes hydrolysis to produce hydroxide ions, which provide hydroxide ions for the electrochemical oxygen sensor;

[0056] (2) Use the potassium hydroxide of 0.1mol / l to adjust the pH of weakly alkaline saline solution to be 8.5; ensure that the pH of the electrolyte ...

Embodiment 3

[0060] A water-based alkaline electrolyte, comprising the following raw materials in parts by weight: 200 kg of deionized water, 150 kg of weakly alkaline salt, and 0.8 kg of a thickener;

[0061] The weakly basic salt is: sodium acetate;

[0062] The thickener is: sodium carboxymethylcellulose.

[0063] The preparation method of described aqueous alkaline electrolyte, comprises the following steps:

[0064] (1) Sodium acetate is dissolved in water, and stirred and mixed evenly to obtain weakly alkaline saline solution;

[0065] Its chemical formula is: CH3COONa=CH3COO-+Na+

[0066] The chemical equation for further hydrolysis of acetate ion is:

[0067] CH3COO-+H2O≒CH3COOH+OH-

[0068] Sodium acetate is dissolved in water and undergoes hydrolysis to generate hydroxide ions, which provide hydroxide ions for the electrochemical oxygen sensor.

[0069] (2) Use the potassium hydroxide of 0.1mol / l to adjust the pH of the weakly alkaline saline solution to be 9; ensure that th...

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Abstract

The invention discloses a water-based alkaline electrolyte. The water-based alkaline electrolyte includes the following raw materials in parts by weight: water, a weakly basic salt, and a thickener; the weakly basic salt is: potassium acetate, acetic acid One of sodium or calcium acetate; the thickener is one of agar, sodium carboxymethylcellulose, sodium polyacrylate or polyvinyl alcohol. The beneficial effects of the present invention are: the water-based alkaline electrolyte of the present invention adds a thickener to the weakly basic salt, the weakly basic salt provides hydroxide ions for the electrochemical reaction, and the added thickener sodium polyacrylate The viscosity is very high, which can prevent the electrolyte from volatilizing in a high-temperature and low-humidity environment. That is, the water-based alkaline electrolyte of the present invention is easy to volatilize in a high-temperature and low-humidity environment, resulting in increased electrolyte concentration and crystallization, which affects the service life of the sensor. The problem; the viscosity of the aqueous alkaline electrolyte is moderate, which avoids the volatilization of the electrolyte and does not affect the transmission speed of ions in the circuit.

Description

technical field [0001] The invention relates to the field of electrochemical sensor electrolytes, in particular to a water-based alkaline electrolyte and a preparation method thereof. Background technique [0002] The performance of the battery electrolyte determines the energy storage and energy density of the battery system, and long-term battery storage will cause electrolyte volatilization, crystalline solids to block various pores, and metal electrodes to be corroded, which will affect the service life of the battery. The existing electrochemical oxygen sensor has problems such as serious volatilization of the electrolyte and easy crystallization to block various pores during use. For example, the low-viscosity electrolyte used in the lead-containing electrochemical oxygen sensor volatilizes severely in a high-temperature and low-humidity environment, which affects the service life of the sensor; while the high-viscosity electrolyte affects the ion transmission speed in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K3/00G01N27/26
CPCC09K3/00G01N27/26
Inventor 梅源马俊平张东旭
Owner 南京艾伊科技有限公司
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