Water-based alkaline electrolyte solution 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 easy crystallization, electrolyte volatilization, serious electrolyte volatilization, etc., and achieve the effect of moderate viscosity and avoid volatilization

Active Publication Date: 2019-03-29
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 the weakly alkaline saline solution to be 8.5; ensure that the pH of the electrol...

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 solution. The water-based alkaline electrolyte solution comprises the following raw materials by weight: water, a weak alkaline salt and a thickener. The weak alkaline salt is one of potassium acetate, sodium acetate or calcium acetate; and the thickener is one of agar, sodium carboxymethyl cellulose, sodium polyacrylate or polyvinyl alcohol. The invention has the beneficial effects that: according to the water-based alkaline electrolyte solution, the thickener is added into the weak alkaline salt, the weak alkaline salt provides hydroxyl ions for electrochemical reaction, and the added thickener sodium polyacrylate has very viscosity, and can prevent the volatilization of the electrolyte solution in a high temperature and low humidity environment, i.e. the water-based alkaline electrolyte solution is volatile in a high temperature and low humidity environment, and can result in the problems of electrolyte solution concentration increase and crystallization, and affection on the sensor service life. The water-based alkaline electrolyte solution has a moderate viscosity, avoids volatilization and has no influence on the iontransmission speed in circuits.

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 Applications(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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