A kind of alkaline primary battery and preparation method thereof

Abstract

The invention discloses a novel alkaline primary battery, which sequentially comprises a positive electrode, a separation membrane, a two-electrode assembly, a separation membrane and a negative electrode, wherein the negative electrode comprises a vanadium boride material. The invention further discloses a preparation method of the novel alkaline primary battery, wherein the preparation method comprises: S1, preparing a negative electrode, wherein a vanadium boride negative electrode is prepared to form a negative electrode plate, S2, preparing a positive electrode, wherein a silver oxide positive electrode is prepared to form a positive electrode plate, S3, forming a positive electrode, wherein the positive electrode plate and an auxiliary electrode plate are combined to form a battery,and the positive electrode partial pressure of the battery is charged at a current density of 5-15 mA / cm<2> to achieve not less than 2.05 V, and S4, preparing a two-electrode assembly, wherein both surfaces of a substrate are respectively coated with the positive electrode and the negative electrode to form two polarities. According to the present invention, the assembled battery has high specificenergy, the voltage platform of the battery system can reach about 1.1 V, and the battery system theoretically does not have a hydrogen evolution self-discharge reaction so as to improve the servicelife and the safety of the battery.

Description

technical field [0001] The invention belongs to the technical field of chemical power sources, and in particular relates to an alkaline primary battery and a preparation method thereof. Background technique [0002] At present, alkaline primary batteries with aqueous electrolytes have the advantages of good safety, low cost, and high-temperature discharge performance, and are widely used in civilian and military batteries. However, the single cell voltage of alkaline primary batteries is generally lower than 1.6V, and the highest specific energy is generally around 200Wh / Kg. Compared with high specific energy lithium-ion secondary batteries, the specific energy is not dominant; in addition, the negative electrode of alkaline primary batteries Materials, such as active metals such as Zn, Al, Mg or Li, have different degrees of self-discharge corrosion and hydrogen evolution in the alkaline electrolyte, which brings certain safety hazards. Generally, highly toxic additives suc...

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Problems solved by technology

However, the single cell voltage of alkaline primary batteries is generally lower than 1.6V, and the highest specific energy is generally around 200Wh / Kg. Compared with high specific energy lithium-ion secondary batteries, the specific energy is not dominant; in addition, the negative electrode of alkaline primary batteries Materials, such as active metals such as Zn, Al, Mg or Li, have different degrees of self-discharge corrosion and hydrogen evolution in the alkaline electrolyte, which brings certain safety hazards. Generally, highly toxic additives such as lead oxide or mercury oxide are added. To reduce the hydrogen evolution potential, this measure has certain environmental pollution and preparation risks; the currently known vanadium boride VB 2 The material is only used in the air battery in the alkaline primary battery system, and the battery voltage is low

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