SU632315A3 - Electrochemical air-zink generator - Google Patents

Description

one

 The invention relates to the field of chemical current sources and concerns generators with a pumpable fuel-electrolyte mixture, which uses an active metal - zinc on the negative electrode and the oxidizing gas oxygen on the positive electrode.

A zinc-air generator containing electrodes and means for moving a fuel-electrolyte mixture from a suspension of zinc in an alkaline electrolyte ij is known. However, the energy density in such a generator is insufficient.

Also known is the zinc-air generator, which is closest to the proposed one, containing an air cathode, an anode, and a fuel-electrolyte mixture formed by zinc powder impregnated with water with alkali, as well as a binder, carboxymethylshellose, and having a consistency of paste, and means for transporting electrolyte mixture 2.

However, in such a generator, the density of energy is insufficient, and the fuel-electrolyte mixture is not very stable.

The purpose of the invention is to increase the energy density.

For this, in the proposed generator in the fuel-electrolyte mixture, the ratio of the volume of the electrolyte to the volume of voids is reduced by a unit of zinc particles. To improve the movement of the fuel / electrolyte paste, the mixture may contain 3% polytetrafluoroethylene.

To eliminate self-storage during storage, the mixture may contain several percent of mercury.

If the volume of liquid becomes less than the volume between the grains, the mixture becomes solid and can no longer be pumped.

Claims (2)

In the proposed Generator, the pasty mixture is homogeneous and perfectly stable; those. There is no tendency to phase separation or internal delamination compared to liquid suspension. The stability that flows from the microstructure created by the critical composition is ensured without the addition of a gel-forming agent and is maintained at any mechanical stresses in the paste and in the generator {pumping, compressing, changing temperature, etc.). It is maintained during the gradual electrochemical transformation of metal grains in the metal oxide grain, as well as during chemical and other disturbances that the paste may undergo (pH change, carbonization, etc.). The stability of the paste is maintained both during storage of the reagent in the tanks and during its circulation in the generator. In the proposed generator, the number of metal grains capable of reacting is very large, and consequently, the energy density increases. The drawing shows the proposed generator. The generator comprises a reservoir 1 for storing zinc paste 2 and a reservoir 3 for oxidized zinc paste. Both ports of the reservoir are connected by a porous insulating cylindrical wall 4, which is a generator partition wall. The screw 5 of conductive material, such as metal, located along the axis, serves simultaneously to supply zinc paste (and zinc oxide) and a negative inert electrode. The connecting pipe 6 is limited by the outer sheath of the Tick to the center-like conductive wall 8. consisting of a metal mesh, active carbon and a hydrophobic binder and forming an air electrode (positive) that allows air to pass through. The power consumed during paste circulation and air circulation is approximately about a few percent of the generator power. The efficiency of such a generator is over 85%. In the proposed generator, passaging during discharge and den- drit formation is excluded. Claim 1. Electrochemical air-zinc generator containing electrodes and means for moving a fuel-electrolyte mixture of a pasty consistency of zinc and silk particles of electrolyte, characterized in that in order to increase the energy density, the ratio of electrolyte volume to the volume of voids between particles zinc in the fuel-electrolyte mixture is one. 2. Generator pop. 1, which is also distinguished by the fact that, in order to improve the movement of the paste, the fuel-electrolyte mixture contains 3% polytetrafluoroethylene. Sources of information taken in. attention in the examination: 1. Results of science and technology. Generators direct conversion of thermal and chemical energy into electrical energy. Moscow, VINITI, 1974, Vol. 2, p. 42-43. 2. Japanese Patent No. 44293, 1973. 86 j- 7 ,.: „.... y ../..-I ////, // III  , ...,;.,: / / / / V i-- ..-.,; - j7l ...;.). f..o.D., -. . /.;, { AUL D-ygs :: - -i / yr vi-X 4 i i i, -: bA. ,,. “Rr-r-i a T .. ..i. :::: 4J: v-U-: W T: 3% / Y-yi CS /:; m feVi: vH  -  .. t " :: A: jv f € ABOUT .