Nickel-hydrogen battery

Abstract

The invention relates to the field of batteries, in particular to a nickel-hydrogen battery. The invention provides a nickel-metal hydride battery working under the condition of high power and high capacity. The technical scheme adopted in the present invention is: a nickel-metal hydride battery, comprising a positive electrode mainly composed of Ni(OH), a diaphragm and an alkaline electrolyte, characterized in that an additive is added to the positive electrode material, and the additive is calcium oxide , thulium oxide, titanium oxide, cobalt oxide mixture, the addition of calcium oxide, thulium oxide, titanium oxide, cobalt oxide are 0.8 ~ 1.2%, 1.8 ~ 2.2%, 1.8 ~ 2.2%, 16 ~ 18%, the alkaline electrolyte is a ternary electrolyte, its components and ratio (mass ratio) are: H2O:KOH:NaOH:LiOH=10:3.5~4:2~3.5:0.1. The beneficial effects of the invention are: not only excellent high-temperature charging performance, but also excellent high-power performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a nickel-hydrogen battery. Background technique [0002] With the development of the market economy, people's growing material and cultural needs, and the continuous improvement of living standards, mobile devices such as digital cameras and laptops have entered thousands of households at a growth rate of 5% and 10% respectively. Various emergency lights, Household electric tools are also gradually entering the family. Mobile devices such as laptops and digital cameras will become necessary for business, entertainment, and life. In the field of power sources used by the above-mentioned mobile devices, most of the power products are rechargeable and environmentally friendly Ni-MH batteries, and have a wide range of applications. development space. However, since most electrical appliances work under high-power conditions and the external environment temperature is high, customers requir...

AI Technical Summary

Problems solved by technology

The standard potential of the former reaction is 0.490V, and the standard potential of the latter reaction is 0.401V. The two are relatively close, so the precipitation of oxygen during the charging process is thermodynamically inevitable. The oxygen precipitated from the positive electrode recombines on the negative electrode, releasing a large amount of The temperature in the battery rises further, and the oxygen evolution overpotential further decreases, resulting in a vicious cycle and even thermal runaway. Therefore, the speed of the oxygen evolution reaction as a side reaction after the temperature rises is particularly significant, which reduces the charging efficiency of the positive electrode. , the higher the temperature, the more obvious this phenomenon is, the precipitation of oxygen and the rise of battery temperature will lead to intensified oxidation and corrosion of the negative electrode hydrogen storage alloy, aging of the diaphragm, and shortened battery life