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Titanium-based tin-antimony-gadolinium oxide cathode material and preparation method thereof

A cathode material, tin-antimony-gadolinium technology, applied in fuel cells, battery electrodes, regenerative fuel cells, etc., can solve problems such as high production costs, poor repeatability, and failure to meet environmental protection requirements, and achieve better quality and lower costs. Effect

Inactive Publication Date: 2019-07-12
XIAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, a large number of reagents such as nitric acid and hydrochloric acid are used in the electrodeposition method, thermal decomposition method, and hot dip method, which cannot meet environmental protection requirements and are not conducive to industrial production, and the prepared tin-antimony-gadolinium oxide coating has poor performance uniformity; while traditional In the sol-gel method, the sol of metal oxide or metal hydroxide is mainly prepared by hydrolysis and polymerization of metal alkoxide, and then the sol is concentrated into a transparent gel with solvent, catalyst, compounding agent, etc. The coating is uniform, but the production cost is high, and the heat treatment process is immature, and the performance of the finally obtained titanium-based tin-antimony-gadolinium oxide electrode is unstable and poor in repeatability

Method used

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  • Titanium-based tin-antimony-gadolinium oxide cathode material and preparation method thereof
  • Titanium-based tin-antimony-gadolinium oxide cathode material and preparation method thereof
  • Titanium-based tin-antimony-gadolinium oxide cathode material and preparation method thereof

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preparation example Construction

[0045] A kind of preparation method of tin antimony gadolinium oxide cathode material, concretely implement according to the following steps:

[0046] Step 1, pretreating the surface of the titanium substrate;

[0047] Step 2, preparing a precursor sol containing tin salt, antimony salt and gadolinium salt, and forming a gel wet film on the surface of the pretreated titanium substrate by dipping and pulling;

[0048] Step 3, drying the gel wet film obtained in step 2 to obtain a gel dry film;

[0049] Step 4, performing crystallization pretreatment on the gel dry film on the surface of the titanium substrate obtained in step 3, until the gel dry film is converted into a tin antimony gadolinium oxide film;

[0050]Step 5, performing crystallization heat treatment on the formed titanium-based tin-antimony-gadolinium oxide thin film to obtain a titanium-based tin-antimony-gadolinium oxide positive electrode material with conductive function.

[0051] The specific steps of step ...

Embodiment 1

[0079] Step 1, pretreating the surface of the titanium substrate;

[0080] Step 1.1. Select a titanium plate as the titanium substrate, polish and polish it with 40, 500 and 1200 mesh sandpaper respectively, and then wash it with acetone and deionized water in turn;

[0081] Step 1.2, put the cleaned titanium substrate into a 40% by mass NaOH solution, soak it at 60°C for 1 hour,

[0082] The titanium substrate soaked in step 1.3 is moved into a boiling oxalic acid solution with a mass percentage of 15% and soaked for 1 hour;

[0083] In step 1.4, the titanium substrate soaked in the oxalic acid solution was ultrasonically cleaned in acetone and deionized water for 5 minutes each, and dried;

[0084] Step 2, preparing a precursor sol containing tin salt, antimony salt and gadolinium salt, and forming a gel wet film on the surface of the pretreated titanium substrate by dipping and pulling;

[0085] Step 2.1, dissolving tin acetate in anhydrous methanol, then adding diethylen...

Embodiment 2

[0100] Step 1, pretreating the surface of the titanium substrate;

[0101] Step 1.1. Select a titanium plate as the titanium substrate, polish and polish it with 40, 500 and 1200 mesh sandpaper respectively, and then wash it with acetone and deionized water in turn;

[0102] Step 1.2, put the cleaned titanium substrate into a 40% by mass NaOH solution, soak it at 70°C for 1.5h,

[0103] The titanium matrix soaked in step 1.3 is moved into a boiling oxalic acid solution with a mass percentage of 15% and soaked for 1.5 hours;

[0104] In step 1.4, the titanium substrate soaked in the oxalic acid solution was ultrasonically cleaned in acetone and deionized water for 7 minutes each, and dried;

[0105] Step 2, preparing a precursor sol containing tin salt, antimony salt and gadolinium salt, and forming a gel wet film on the surface of the pretreated titanium substrate by dipping and pulling;

[0106] Step 2.1, dissolving tin acetate in anhydrous methanol, then adding ethanolamin...

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Abstract

The invention discloses a titanium-based tin-antimony-gadolinium oxide cathode material of a lead liquid flow battery and a preparation method thereof. The preparation method comprises the steps of: performing pretreatment on the surface of a titanium substrate; preparing a precursor sol containing a tin salt, an antimony salt and a gadolinium salt, and forming a gel wet film on the surface of thetitanium substrate by adopting a sol-gcl dip-coating method; drying the gel wet film to obtain a gel dry film on the titanium substrate; performing crystallization pretreatment of the gel dry film onthe titanium substrate until the gel dry film is converted to a tin-antimony-gadolinium oxide film; and performing crystallization thermal treatment of the formed tin-antimony-gadolinium oxide film to obtain a titanium-based tin-antimony-gadolinium oxide cathode material with a conductive function. The titanium-based tin-antimony-gadolinium oxide electrode of the lead liquid flow battery comprises a titanium substrate and a tin-antimony-gadolinium oxide coating on the surface of the titanium substrate. The method can be used for formation of the tin-antimony-gadolinium oxide film at the surface of the large-scale titanium substrate, the obtained electrode material is uniform in performance, high in conductivity and good in electrochemical corrosion resistance. The preparation process is easy to control, stable in process and high in repeatability, and can be suitable for industrial production.

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 the positive electrode material of the lead liquid flow battery, in particular to a preparation method of the titanium-based tin antimony gadolinium oxide positive electrode material of the lead liquid flow battery. Background technique [0002] Lead flow battery is a new type of redox flow battery. Soluble lead ions are used as the matrix solution, such as lead methanesulfonate, lead perchlorate, lead trifluoromethanesulfonate, lead fluoroborate, etc. When charging, the soluble lead ions are reduced on the surface of the negative electrode to form metallic lead. The surface of the positive electrode is oxidized to form solid lead dioxide, forming a potential difference. Since a single electrolyte is used, no diaphragm is needed, and only a certain distance between the positive and negative electrodes is required. I...

Claims

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Application Information

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IPC IPC(8): H01M4/90H01M8/18
CPCH01M4/9016H01M4/9075H01M8/188Y02E60/50
Inventor 刘政蒋百铃罗小飞
Owner XIAN UNIV OF TECH
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