Sodium vanadium oxychloride phosphate positive electrode material, preparation method and sodium ion battery

A technology of sodium vanadyl chlorophosphate and positive electrode material, which is applied in secondary batteries, battery electrodes, chemical instruments and methods, etc., can solve the problem of reducing material mass/volume energy density, affecting material electrochemical performance, and material particle size uniformity. Influence and other issues, to achieve the effect of high discharge capacity, excellent all-weather performance, and stable crystal structure

Pending Publication Date: 2021-12-03
NORTHEAST NORMAL UNIVERSITY
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Problems solved by technology

However, these methods have high requirements on the process, which will undoubtedly increase the production cost, and will also affect the electrochemical performance of the material. Preparation of a sodium vanadium fluorophosphate / carbon composite and the application of the composite. Application number: 201711090279.7 A complex secondary carbon coating process is used
Since carbon materials will increase the material quality and reduce the overall mass / volume energy density of the material, the particle size uniformity of the material will be affected and the repeatability will be low

Method used

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  • Sodium vanadium oxychloride phosphate positive electrode material, preparation method and sodium ion battery
  • Sodium vanadium oxychloride phosphate positive electrode material, preparation method and sodium ion battery
  • Sodium vanadium oxychloride phosphate positive electrode material, preparation method and sodium ion battery

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Embodiment 1

[0046] S1: Put V 2 o 5 , oxalic acid, NH 4 h 2 PO 4 added to water, V 2 o 5 : Oxalic acid: NH 4 h 2 PO 4 The molar ratio is 1:3:2, V 2 o 5 The molar ratio of vanadium and water in the mixture is =1-10; placed in a reaction vessel and heated and stirred at 80°C for 1 hour;

[0047] S2: Add NaF and NaCl into the reaction vessel in step S1 according to the ratio of 1:3, and react for 45 minutes to obtain a uniform transparent solution A;

[0048] S3: adjust the pH of the transparent solution A prepared in step S2, pH = 7, transfer the adjusted solution to a reaction kettle, heat in an oven at 170°C, and heat for 12 hours;

[0049] S4: centrifuging and washing the product after the reaction in step S3, putting it in an oven at 100° C. to dry to obtain solid B;

[0050] S5: Perform high-temperature annealing at 400° C. for 4 hours on the solid B prepared in step S4 to obtain a sodium vanadyl chlorophosphate positive electrode material.

Embodiment 2 6

[0052] The steps of the method are the same as in Example 1, except that the pH in step S3 is 6, 8, 9, and 10, respectively.

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Abstract

The invention discloses a sodium vanadium oxychloride phosphate positive electrode material, a preparation method and a sodium ion battery. The molecular formula of the material is Na3(VO)2(PO4)2FxCly, the space group thereof is I4/mmm, and belongs to a tetragonal system. The Na3(VO)2(PO4)2FxCly is in a uniform and regular cube shape, and by adjusting and controlling the anion site of the material, the sodium-ion battery positive electrode material with high storage stability, excellent electrochemical performance and all-weather performance is successfully prepared by adopting a one-step hydrothermal mode, and the sodium-ion battery positive electrode material is prepared by adjusting and controlling an anion mode, namely adjusting and controlling the proportion of F and Cl anions and adjusting and controlling the hydrothermal temperature. The prepared sodium vanadium oxyphosphate positive electrode material has more excellent electrochemical performance, the synthesis process method is simple, precise instruments are not needed, and the method is suitable for large-scale production.

Description

technical field [0001] The invention relates to the technical field of sodium ion battery cathode materials, in particular to a sodium vanadyl chloride phosphate cathode material, a preparation method and a sodium ion battery. Background technique [0002] To develop high-performance sodium-ion batteries (SIBs), advanced electrode materials are urgently needed. Compared with positive electrode materials, negative electrode materials have received more attention and research is more mature. For example: negative electrode materials such as hard carbon, alloy compounds, and selenides have been proven to have excellent sodium storage characteristics and future development prospects. Therefore, the electrochemical performance of SIBs largely focuses on their cathode materials. In the research process of cathode materials, more attention is paid to the electrochemical performance of materials: high rate, long cycle, high energy density and wide temperature range performance, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M10/054H01M10/058C01B25/455
CPCH01M4/5825H01M4/582H01M10/054H01M10/058C01B25/455C01P2004/38C01P2006/40Y02E60/10Y02P70/50
Inventor 吴兴隆谷振一吕红艳
Owner NORTHEAST NORMAL UNIVERSITY
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