Aqueous alkaline electrolyte and preparation method thereof

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...

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