Nickel-hydrogen power battery and preparation method therefor

Abstract

The invention provides a nickel-hydrogen power battery and a preparation method therefor. The nickel-hydrogen power battery comprises a nickel hydride positive electrode, a hydrogen storage alloy negative electrode and an alkaline electrolyte; the positive electrode active material is 70.19-74.57% of nickel hydroxide crystals; the contents of coated cobalt, zinc and cobalt on the surface of the nickel hydroxide are 14.23-15.31%, 4.0-4.5% and 0.7-1.5% separately; 6.5-8.5% of ultra-low temperature active agent is added in the positive electrode active material; the negative electrode substrate adopts a superconducting copper wire mesh; the copper wire mesh is in a three-dimensional structure; and the negative electrode hydrogen storage alloy powder comprises 34.5 parts of Mm, 53.0 parts of nickel, 6.5 parts of cobalt, 5.0 parts of manganese, 1.0 part of aluminum and 0.5 part of additive.

Description

technical field [0001] The invention relates to an electrode, in particular to a nickel-hydrogen battery and a manufacturing method thereof, belonging to the field of electrochemistry. Background technique [0002] At present, the types of power storage batteries that can meet the needs are mainly lithium-ion batteries, nickel-metal hydride batteries and fuel cells. [0003] However, the safety problems of lithium-ion batteries have always existed. Power lithium-ion batteries also have problems such as overcharge resistance and poor thermal stability. Fuel cells are still in the development stage. Nickel-metal hydride batteries are known as "environmental protection batteries" because the electrode materials do not contain heavy metal elements such as cadmium, lead, and mercury that cause great harm to the environment. They have high energy density and high output power, so they are more competitive than nickel-cadmium batteries in the market Advantage. Since the 1990s, Ja...

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Problems solved by technology

[0003] However, the safety problems of lithium-ion batteries have always existed, power lithium-ion batteries still have problems such as overcharge resistance and poor thermal stability, and fuel cells are still in the development stage.

The gram specific energy or gram specific capacity of Ni-MH batteries is relatively high. Taking AA600 batteries as an example, Ni-Cd batteries have normal capacity, that is, the active material or electrode group can fully fill the internal space of the battery; while Ni-MH batteries are ultra-low In terms of capacity, the filling of the active material or the electrode group is basically less than half of the internal space of the battery, resulting in a series of problems: if the remaining space inside the battery case is allowed to be too large, the amount of active material or the tightness of the electrode group assembly will be too large. Small size, which is not conducive to the chemical reaction of the active material, and the low pass rate and the danger of the electrode group shaking in the shell due to too small assembly tightness; and if the internal space of the battery is to be filled, the amount of active material and diaphragm will inevitably be wasted. Increased cost. Domestic manufacturers generally increase the amount of positive and negative carriers and diaphragms to increase the tightness of assembly, which undoubtedly increases the cost

However, the existing Ni-MH rechargeable batteries have disadvantages such as large battery self-discharge, poor charge retention, users need to charge before use, the battery cannot be stored for a long time after charging, and the power loss is fast.

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