CN-121983595-A - Carbon fiber felt anode material with tin-antimony oxide coating and preparation method thereof

Abstract

The invention discloses a preparation method of a carbon fiber felt anode material with a tin-antimony oxide coating, which comprises the steps of 1, selecting a carbon fiber felt, cleaning by using acetone to remove greasy dirt, cleaning by using deionized water, finally drying and dehydrating, 2, preparing sol containing tin salt and antimony salt, 3, forming a gel wet film on the surface of carbon fibers in the carbon fiber felt by adopting an impregnation method by taking the sol containing tin salt and antimony salt obtained in the step 2 as precursor sol, drying the gel wet film to obtain a gel dry film, and 4, carrying out vacuum plasma surface treatment on the gel dry film obtained in the step 3 until the gel dry film is converted into a tin-antimony oxide film with a conductive function, and obtaining the carbon fiber felt anode material with the tin-antimony oxide coating. The invention is used for improving the charge transfer resistance and corrosion resistance of the anode material and improving the battery efficiency.

Inventors

• LIU ZHENG
• ZHAO YUN

Assignees

• 西安理工大学

Dates

Publication Date

20260505

Application Date

20260130

Claims (8)

1. 1. The carbon fiber felt anode material with the tin-antimony oxide coating is characterized by comprising a carbon fiber felt and a tin-antimony oxide film with a conductive function, wherein the tin-antimony oxide film is formed on the surface of carbon fibers of the carbon fiber felt.
2. 2. The preparation method of the carbon fiber felt anode material with the tin-antimony oxide coating is characterized by comprising the following steps of: Step 1, selecting a carbon fiber felt, cleaning by using acetone to remove greasy dirt, cleaning by using deionized water, and finally drying and dehydrating; Step 2, preparing sol containing tin salt and antimony salt; Step 3, taking the sol containing tin salt and antimony salt obtained in the step 2 as precursor sol, and forming a gel wet film on the surface of the carbon fiber in the carbon fiber felt by adopting an impregnation method; and 4, carrying out vacuum plasma surface treatment on the gel dry film obtained in the step 3 until the gel dry film is converted into a tin-antimony oxide film with a conductive function, and obtaining the carbon fiber felt anode material with the tin-antimony oxide coating.
3. 3. The method for preparing the carbon fiber felt anode material with the tin-antimony oxide coating according to claim 2, wherein in the step 1, the carbon fiber felt is degreased by acetone, and ultrasonic cleaning is carried out for 5 min-10 min.
4. 4. The method for preparing a carbon fiber felt anode material with tin antimony oxide coating according to claim 3, wherein in the step 1, deionized water is used for cleaning, and ultrasonic cleaning is 5 min-10 min.
5. 5. The method for preparing a carbon fiber felt anode material with tin antimony oxide coating according to claim 4, wherein in the step 1, vacuum extraction is performed at 100 ℃ to 120 ℃ for 1h to 3h for drying and dehydration.
6. 6. The method for preparing a carbon fiber felt anode material with tin antimony oxide coating according to claim 5, wherein in the step 2, the sol containing tin salt and antimony salt is prepared by the following method: Dissolving tin salt in an organic solvent, adding a chelating agent, and stirring to form tin salt sol; In the sol containing the tin antimony salt, the mol ratio of Sn 4+ to Sb 3+ is 1:0.125; in the tin salt sol, tin salt is tin acetate, chelating agent is ethanolamine, and organic solvent is methanol; in the tin-antimony salt sol, the molar ratio of the tin salt to the chelating agent to the organic solvent to the antimony salt is 1:1.5-3.5:25-35:0.125.
7. 7. The method for preparing a carbon fiber felt anode material with tin antimony oxide coating according to claim 6, wherein the dipping time in step 3 is1 min-5 min, the drying temperature is 80-100 ℃ and the time is 10 min-30 min.
8. 8. The method for preparing a carbon fiber felt anode material with tin antimony oxide coating according to claim 7, wherein in the step 4, the vacuum plasma surface treatment is specifically that the oxygen feeding amount is 1 sccm-3 sccm, the vacuum degree is 10 -2 Pa-10 -1 Pa, the frequency is 10 KHz-15KHz, and the power is 5W-10W, the treatment time is 10 min-30 min.

Description

Carbon fiber felt anode material with tin-antimony oxide coating and preparation method thereof Technical Field The invention belongs to the technical field of new energy material preparation, and particularly relates to a carbon fiber felt anode material with a tin-antimony oxide coating and a preparation method of the carbon fiber felt anode material with the tin-antimony oxide coating. Background Lead salt single flow batteries are one type of deposition redox flow battery. The electrolyte adopts soluble lead (II) salt (such as lead fluoroborate, The working principle of the lead methylsulfonate and the corresponding acid thereof is that Pb 2+ in the electrolyte is subjected to oxidation-reduction reaction at the positive electrode and the negative electrode under different potentials, pbO 2 is deposited on the positive electrode plate during charging, pb simple substance is formed on the negative electrode plate, and during discharging, pbO 2 at the positive electrode and Pb at the negative electrode are redissolved into free Pb 2+ to return to the electrolyte. the carbon fiber felt has the characteristics of porous structure, electrochemical corrosion resistance, low price and the like, and is currently used as a positive and negative plate material to provide an electrochemical reaction place. The lead salt single flow battery has the advantages of good weather resistance, low cost, no need of a proton exchange membrane with high price, simple structural design, great cost saving, high safety, and no danger of explosion combustion and the like, and Pb 2+ generated by hot melting oxidation-reduction reaction returns to the solution again after PbO 2 serving as the positive electrode active substance contacts Pb dendrite serving as the negative electrode active substance. however, the carbon fibers in the carbon fiber felt have poor binding force with the active material PbO 2 (mainly β -PbO 2 in the acid electrolyte) deposited on the positive electrode, and are easily impacted by the solution to fall off, resulting in the loss of battery capacity. In addition, in the deposition process of the anode active material, pbO x (1 < x < 1.45) is easy to generate at the interface of the carbon fiber and the deposit, so that a passivation layer is formed, the efficiency of the battery is reduced, and the failure rate of the battery is accelerated. The Sn-Sb oxide has high conductivity, snO 2、Sb2O3 belongs to a rutile crystal system, the lattice size and the unit cell volume are smaller than those of PbO 2, the Sn-Sb oxide is used as an intermediate layer to reduce the internal stress between carbon fibers and PbO 2 and prevent PbO 2 from falling off, and meanwhile, the formation of a passivation substance of PbO x (1 < x < 1.45) can be reduced or even eliminated due to the generation of Sn-Sb-Pb oxide at an interface in the electrochemical deposition process. Tin antimony oxide coatings are typically prepared on metal (e.g., titanium) surfaces by electrodeposition, thermal decomposition, hot dip, sol-gel of metal alkoxides, and the like. However, no literature report exists on the surface of the carbon fiber in the porous carbon fiber felt, and the tin-antimony oxide coating layer formed on the surface of the carbon fiber felt by the electrodeposition method is formed only on the carbon fiber under the action of an electric field, so that the surface structure of the carbon fiber is damaged by a thermal decomposition method, a hot dipping method and a traditional sol-gel method heat treatment process. The finally obtained tin-antimony oxide coating has poor uniformity, unstable performance and poor repeatability. Disclosure of Invention The invention aims at providing a carbon fiber felt anode material with a tin-antimony oxide coating, which is used for improving the charge transfer resistance, corrosion resistance and battery efficiency of the anode material. In order to achieve the purpose, the technical scheme adopted by the invention is that the carbon fiber felt anode material with the tin-antimony oxide coating comprises a carbon fiber felt and a tin-antimony oxide film with a conductive function, wherein the tin-antimony oxide film is formed on the surface of carbon fibers of the carbon fiber felt. The invention aims at providing a preparation method of a carbon fiber felt anode material with a tin-antimony oxide coating, which is used for improving the charge transfer resistance, corrosion resistance and battery efficiency of the anode material. In order to achieve the aim, the technical scheme adopted by the invention is that the preparation method of the carbon fiber felt anode material with the tin-antimony oxide coating is implemented according to the following steps: Step 1, selecting a carbon fiber felt, cleaning by using acetone to remove greasy dirt, cleaning by using deionized water, and finally drying and dehydrating; Step 2, preparing sol containing tin salt and antimony salt; St