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Sodium vanadium fluorophosphate electrode coated with metal oxide layer and preparation method thereof

A technology of sodium vanadium fluorophosphate and oxide layer, which is applied in electrode manufacturing, battery electrodes, circuits, etc., can solve problems such as de-V, and achieve the effects of increasing yield, reducing interface side reactions, and improving capacity retention.

Active Publication Date: 2021-01-05
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the problems existing in the prior art, the present invention provides a sodium vanadium phosphate electrode coated with a metal oxide layer and a preparation method thereof, which solves the problem of removing V and F during the cycle process of positive electrode materials for sodium ion batteries, and improves It improves the cycle stability of the material in the process of charging and discharging, and improves the capacity fading problem of the material. At the same time, it has the advantages of uniform and dense coating layer, easy control of the coating amount, and a significant increase in output.

Method used

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  • Sodium vanadium fluorophosphate electrode coated with metal oxide layer and preparation method thereof
  • Sodium vanadium fluorophosphate electrode coated with metal oxide layer and preparation method thereof
  • Sodium vanadium fluorophosphate electrode coated with metal oxide layer and preparation method thereof

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preparation example Construction

[0025]The preparation method of the sodium vanadium fluorophosphate electrode coated with a metal oxide layer of the present invention adopts atomic layer deposition technology and includes the following steps:

[0026]1) The active material Na3V2(PO4)2F3, Conductive carbon black SP, binder, and solvent are mixed in a certain proportion, ball milled, scraped, and dried to obtain spare electrode sheets. The electrode sheets are put into the reaction chamber of the atomic layer deposition system, and the reaction chamber The temperature is adjusted to 150~250℃, and the pressure is adjusted to 20~80Pa.

[0027]2) Perform atomic layer deposition treatment to obtain the Na coated with a metal oxide layer3V2(PO4)2F3Electrode material.

[0028]Na used in step 1)3V2(PO4)2F3It is synthesized by hydrothermal method, sol-gel method or solid phase method.

[0029]The binder in step 1) is PVDF or CMC, and the solvent is NMP or H2O.

[0030]The sample processed by atomic layer deposition in step 1) is flake rat...

Embodiment 1

[0036]Preparation of Na by sol-gel reaction3V2(PO4)2F3Material, the binder prepared by the electrode sheet is PVDF, the solvent is NMP; the temperature of the reaction chamber of the atomic layer deposition system is 150℃, the pressure is 40Pa, the metal precursor is titanium tetraisopropoxide, the temperature of the source bottle is set to 60℃, and the number of cycles is 20cycle , Deposited TiO2Molecular layer.

[0037]1) Preparation of Na by sol-gel reaction3V2(PO4)2F3material

[0038]Weigh a certain mass of NaF, NH according to Na:V:P:F=3:2:2:34VO3And NH4H2PO4, Dissolve the three drugs in 30ml ultrapure water, and add a certain amount of citric acid monohydrate as a chelating agent to the NaF aqueous solution. A magnetic stir bar was added to the three solutions to stir to obtain a uniformly mixed aqueous solution.

[0039]The above three solutions are mixed. The mixed solution is placed on a magnetic heating stirring table for oil bath heating, and the oil bath heating temperature is se...

Embodiment 2

[0047]Prepare Na according to the example3V2(PO4)2F3Materials, and proceed as follows:

[0048]1) The specific steps of the electrode sheet preparation process are:

[0049]First weigh 20 mg of binder PVDF, pour it into a ball mill tank, and add organic NMP solvent to ball mill for 20 minutes to make the binder evenly dispersed in the solvent. Then follow the active substance Na3V2(PO4)2F3: Conductive carbon black: Binder=7:2:1 ratio of weighing medicine Na3V2(PO4)2F3: Conductive carbon black, add it to the ball milling tank and continue ball milling for about 3 hours. Use a 250μm doctor blade to scrape the ball-milled slurry on the aluminum foil, dry it at 80°C for 2h after scraping, and vacuum-dry it at 120°C for 10h to obtain a spare electrode sheet.

[0050]The process of putting the electrode sheet into the reaction chamber of the atomic layer deposition system specifically includes the following steps:

[0051]Cut the spare electrode sheet into a rectangle matching the sample stage, and s...

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Abstract

The invention provides a sodium vanadium fluorophosphate electrode coated with a metal oxide layer and a preparation method thereof, and the sodium vanadium fluorophosphate electrode coated with the metal oxide layer is obtained by depositing the metal oxide layer on a Na3V2(PO4)2F3 electrode slice through adoption of an atomic layer deposition method. The preparation method solves the problems ofV and F removal in the cyclic process of the positive electrode material for the sodium-ion battery, improves the cyclic stability of the material in the charge-discharge process, improves the capacity attenuation problem of the material, and has the advantages of uniform and compact coating layer, easily controlled coating amount and remarkably improved yield.

Description

Technical field[0001]The invention belongs to the application field of electrochemical energy storage secondary batteries, and specifically relates to a sodium vanadium fluorophosphate electrode coated with a metal oxide layer and a preparation method thereof.Background technique[0002]Since the commercial application of lithium ion batteries in the 1990s, due to their high energy density, long cycle life, high working voltage, low self-discharge rate and no memory effect, they have been widely used in portable computers, mobile phones and digital cameras. In electronic equipment, and expand to electric vehicles, smart grids and renewable energy large-scale energy storage systems. It can be seen from the demand for large-scale energy storage systems that ideal secondary batteries not only require suitable electrochemical performance, but also must take into account social and economic benefits such as rich resources and low prices. However, the scarcity and uneven distribution of lit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1397H01M4/04H01M4/136H01M10/054
CPCH01M4/0428H01M4/136H01M4/1397H01M10/054Y02E60/10
Inventor 宋忠孝张娜李龙丁书江李雁淮孟瑜于广泳
Owner XI AN JIAOTONG UNIV
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