Zn cathode secondary battery and Zn cathode of the same and their preparation method

Abstract

This invention relates to secondary battery zinc cathode, which comprises integral flow and cathode materials coated or filled into the integral flow, wherein, the cathode materials comprises cathode active subject and adhesive agent; the cathode active subject comprises zinc subject and zinc oxidation; the cathode active subject also comprises zinc not salable in alkaline electrolysis liquid.

Description

technical field [0001] The present invention relates to a battery and its negative electrode and their preparation method, more specifically to a zinc negative electrode secondary battery, the battery's zinc negative electrode and their preparation method. Background technique [0002] For traditional secondary batteries with zinc as the negative electrode, such as zinc-silver batteries and zinc-nickel batteries, the battery capacity decays rapidly with the increase of the number of cycles. This capacity fading is attributed to the change in the morphology of the zinc electrode, which is called deformation of the zinc electrode by those skilled in the art. [0003] In the secondary battery with zinc element and / or zinc oxide as the negative electrode active material, the zinc on the electrode is transformed into zinc oxide during the discharge process, and transformed into metallic zinc again during the charge process. During the discharge process of the battery, the metal ...

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Problems solved by technology

[0010] Although the above method can inhibit the deformation of the zinc electrode, after many cycles of the battery, the remaining rate of the zinc electrode area is not high, and the battery capacity decays quickly, so the effect of using the above method to suppress the deformation of the zinc electrode is still unsatisfactory.

[0011] In addition, the method disclosed in US3873367 adds calcium hydroxide to the electrode. Although it can suppress the deformation of the zinc electrode to a certain extent, the more substances that cannot participate in the discharge are added to the electrode, the less the zinc content is, and the released The energy is also less, resulting in a lower energy density of the electrode

[0012] The methods disclosed in US5302475, US5302475, and US4273841 have introduced fluoride ions, carbonate ions, phosphate ions, borate ions, arsenate ions, and silicate ions in the electrolyte, and the conductivity of the electrolyte is affected by the concentration of potassium hydroxide. After the above-mentioned ions are added, the concentration of potassium hydroxide in the solution will decrease, resulting in a decrease in the conductivity of the electrolyte and an increase in the internal resistance of the battery, so that it cannot be discharged at a high current, and the high current discharge performance of the battery is poor.