Water-based alkaline electrolyte solution and preparation method thereof

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...

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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