A kind of titanium-based lanthanum nickelate electrode and preparation method thereof

Abstract

The invention discloses a titanium-based lanthanum nickelate electrode and a preparation method thereof. The preparation method comprises the following steps: (1) using a mixed sol containing a lanthanum salt and a nickel salt as a precursor sol, and applying a dipping and pulling method on the surface of a titanium substrate Forming a gel wet film; (2) drying the gel wet film to obtain a gel dry film; (3) performing crystallization pretreatment on the gel dry film obtained in step (1) until the gel dry film is transformed into It is a lanthanum nickelate thin film; (3) repeat steps (1) to (3) dipping and pulling-drying-crystallization pretreatment several times, and finally carry out crystallization heat treatment to the formed lanthanum nickelate thin film to obtain a titanium-based lanthanum nickelate electrode . The invention solves the serious defect of the electrochemical polarization of the metal electrode, prevents the formation of a metal oxide passivation film on the Ti surface, and can exert the advantages of high electrical conductivity and uniform electrical conductivity distribution of the metal base electrode.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy and new materials, and relates to the preparation technology of electrode materials for liquid flow batteries, in particular to a lanthanum nickelate electrode material with metal titanium as a matrix and a preparation method thereof. Background technique [0002] Energy storage technologies, such as redox flow batteries such as sodium-sulfur batteries, all-vanadium flow batteries, and lead methanesulfonate flow batteries, have been widely developed. However, because the electrode material of its key components is continuously exposed to acid-base and electrochemical corrosion conditions for a long time, its performance will deteriorate, especially its electrical conductivity, and its service life will be shortened. At present, the electrode materials mainly include: metal electrodes, carbon electrodes, composite conductive plastic electrodes, etc. Carbon, such as graphite, carb...

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Problems solved by technology

Carbon such as graphite, carbon cloth, graphite felt, etc. have good electrical conductivity and corrosion resistance, but the electrochemical activity of this type of electrode is poor, the surface is hydrophobic, and the reversibility of the electrode reaction is poor.

Composite conductive plastics, such as conductive polymers, polymer composite materials, etc., have excellent comprehensive properties and corrosion resistance, but due to the characteristics of the preparation process, the conductivity and uniformity of the plate are relatively low among several types of materials.

The conductivity of metal electrodes ranks first among several materials. Metals such as Pt, Rh, Ir, etc., have uniform conductivity distribution on the electrode surface and high electrode reaction efficiency. However, due to serious electrochemical polarization, oxide films are easily formed on the surface , the electrochemical reversibility of the electrode is poor, and a passivation film is easily formed in the anode area, hindering the continuation of the electrode reaction, and the price is expensive, which limits its application in flow batteries

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