A preparation method of a composite material, a nickel-iron battery electrode comprising the composite material, and a nickel-iron battery

Abstract

The invention relates to a preparation method of a composite material, a nickel-iron battery electrode comprising the composite material, and a nickel-iron battery, wherein one embodiment of the preparation method of the composite material comprises the steps of: (1), dissolving an organic iron compound and an organic indium compound in an organic solvent; (2), dropwise adding the mixed solution on a porous carbon material, and vacuumizing after continuously pressing and string, so that the mixed solution is impregnated in the porous channel of the porous carbon, and simultaneously, the organic solvent is volatized; and (3), continuously repeating the step (2), uniformly mixing the obtained material with sulfur, filling in a sealed glass bottle, sleeving a stainless steel protective sleeve, and putting in an argon tube furnace to roast, so that a FeS<x> / InS<x> / C composite material is obtained. The preparation method in the invention is simple in process; the prepared material is greenand environment-friendly; furthermore, iron dissolution side reactions and hydrogen evolution side reactions are effectively inhibited; the relatively high mass specific capacity and coulombic efficiency can be realized; and thus, practical application requirements can be satisfied.

Description

technical field [0001] The invention relates to a composite material preparation technology, in particular to a preparation method for a composite material, a nickel-iron battery electrode containing the composite material, and a nickel-iron battery. Background technique [0002] With the rapid development of the electric vehicle industry, the lithium and cobalt elements used in lithium-ion battery materials are increasingly scarce, and cobalt is highly toxic, and the organic electrolyte used has poor chemical stability and is prone to explosion and fire. The iron and nickel elements used in nickel-iron batteries have high reserves, low cost, low toxicity, and water-based electrolyte, which is environmentally friendly and safe. Therefore, nickel-iron batteries show greater advantages in the field of large-scale energy storage. Of course, there are still many problems in traditional nickel-iron batteries. The most critical problem is that the dissolution of iron causes the s...

AI Technical Summary

Problems solved by technology

Of course, there are still many problems in traditional nickel-iron batteries. The most critical problem is that the dissolution of iron causes the shuttle effect, resulting in unstable electrode structure, resulting in low battery capacity and poor cycle stability.

The traditional solution is to physically or chemically combine the active material with various carbon materials to increase the battery capacity to a certain extent, but it cannot limit the dissolution of iron, so that the side reaction product, ferrite ion, diffuses to the positive electrode. , and deposited on the surface of the positive electrode to form a passivation film, hindering the OH - Rapidly transported to the surface of the positive electrode and reacted, thus increasing the polarization of the electrode and reducing the battery capacity

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