RU2343594C1 - Method for manufacturing foil electrode for cadmium-nickel accumulator - Google Patents

Abstract

FIELD: electricity.

SUBSTANCE: invention is attributed to the field of electric engineering and can be used in manufacturing cadmium or nickel electrodes for alkaline accumulators. In this invention method for manufacturing foil electrode for cadmium-nickel accumulator includes rolling of nickel powder into foil, foil baking in hydrogen atmosphere and active mass infusion. In this process carbonyl nickel powder is taken as nickel powder, the powder is annealed at temperature of 700÷800°C for 30-60 min, obtained powder is milled and sieved. The powder is rolled in cylinders at pressure of 250 kg/cm²±5% until thickness of 40÷80 micron and porosity of 40÷60%, sintering is performed at temperature of 600÷700°C for 1 hour ±10%. Active mass infusion is performed by means of foil saturation in cadmium or nickel salts depending on electrode type and sedimentation in alcali liquor. After preset active mass quantity has been infused into electrode, the electrode is flushed out and dried.

EFFECT: increase in specific electric characteristics.

2 cl, 1 ex

Description

The invention relates to the field of electrical engineering and can be used in the manufacture of nickel or cadmium electrodes for alkaline batteries.

A known method of manufacturing an electrode, including rolling the base, its sintering in a reducing atmosphere and the subsequent introduction of the active mass (RF patent No. 2098892 C1, CL HM 4/24, 1997). The specified known method of manufacturing an electrode does not provide the required specific characteristics due to the significant mass of the base.

Of the known methods of manufacturing an electrode, the closest in combination of essential features and technical result achieved is a method of manufacturing an electrode, comprising rolling nickel powder into a foil, sintering the foil in a hydrogen medium and introducing an active mass (RF patent No. 2152669 C1, class H01M 4/24, 2000). The specified method of manufacturing the electrode also does not provide the required specific characteristics due to the significant mass of the base.

The technical result of the invention is the creation of an electrode for a nickel-cadmium battery having increased specific electrical characteristics.

The specified technical result is achieved by the fact that in the method of manufacturing a foil electrode for a nickel-cadmium battery, comprising rolling nickel powder into a foil, sintering the foil in a hydrogen medium and introducing an active mass, carbonyl nickel powder is taken as nickel powder, the powder is annealed at at a temperature of 700 ÷ 800 ° C for 30 ÷ 60 minutes, the resulting powder is subjected to grinding and sieving, for rolling the foil, a powder with a particle size of 3 ÷ 5 μm is taken, the powder is rolled in rolls at a pressure of 250 kg / cm ² ± 5% to a foil thickness of 40 ÷ 80 μm and a porosity of 40 ÷ 60%, sintering is carried out at a temperature of 600 ÷ 700 ° C for 1 hour ± 10%.

The indicated modes and parameters in the manufacture of the foil electrode provide a given thickness and porosity of the electrode, which provide further enhanced specific electrical characteristics.

It is advisable that the introduction of the active mass was carried out by impregnation in cadmium or nickel salts, depending on the type of electrode, and deposition in an alkali solution, after introducing a given amount of active mass into the electrode, the electrode is washed and dried. The specified method of introducing the active mass is technological and provides the introduction of the required amount of active mass for both the cadmium and nickel electrodes.

The analysis of the prior art showed that the claimed combination of essential features set forth in the claims is unknown. This allows us to conclude that it meets the criterion of "novelty." To verify the conformity of the claimed invention with the criterion of "inventive step", an additional search was carried out for known technical solutions in order to identify features that match the distinctive features of the claimed technical solution from the prototype. It is established that the claimed technical solution does not follow explicitly from the prior art. Therefore, the claimed invention meets the criterion of "inventive step". The invention is illustrated by an example of a practical implementation of the method of manufacturing the claimed electrode.

Practical example

The carbonyl nickel powder was annealed at a temperature of 730 ° C for 40 minutes. The resulting powder was subjected to grinding in a ball mill and subsequent sieving. A powder with a particle size of 4 μm was rolled in rolls at a pressure of 260 kg / cm ² into a foil with a thickness of 50 μm and a porosity of 55%, then the foil was sintered in a hydrogen furnace for an hour. The resulting foil was impregnated in a solution of Nickel nitrate with a density of 1.45 g / cm ³ at a temperature of 80 ° C. Precipitation of the active substance was carried out by treatment in a solution of potassium hydroxide with a density of 1.4 g / cm ³ . Then the electrode was washed in distilled water and dried in air at a temperature of 60 ° C. Electrochemical tests of the electrode as part of a 2-electrode prototype battery showed stable high discharge characteristics.

Based on the foregoing, we can conclude that the claimed method of manufacturing a foil electrode can be implemented with the achievement of the claimed result, i.e. It meets the criterion of “industrial applicability”.

Claims (2)

1. A method of manufacturing a foil electrode for a nickel-cadmium battery, comprising rolling nickel powder into a foil, sintering the foil in a hydrogen medium and introducing an active mass, characterized in that carbonyl nickel powder is taken as nickel powder, the powder is annealed at a temperature of 700 ÷ 800 ° C for 30 ÷ 60 minutes, the resultant powder was subjected to grinding and sieving, rolling of the foil take powder with a particle size of 3: 5 microns, rolling the powder in rolls is carried out at a pressure of 250 kg / cm ² ± 5%, the rolling is carried out until the foil thickness 40 ÷ 80 microns and a porosity of 40 ÷ 60%, the sintering is carried out at a temperature of 600 ÷ 700 ° C for 1 h ± 10%. 2. The method according to claim 1, characterized in that the introduction of the active mass is carried out by impregnating the foil in cadmium or nickel salts, depending on the type of electrode, and precipitating in an alkali solution, after introducing a given amount of the active mass into the electrode, the electrode is washed and dried .