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Vanadium-based sodium oxyfluorophosphate type sodium battery positive electrode material and preparation method thereof

A technology of vanadium-based sodium oxyfluorophosphate and sodium fluorophosphate, which is applied in the field of positive electrode materials and preparations of vanadium-based sodium oxyfluorophosphate-type sodium batteries, and can solve problems that restrict practical applications, such as low electrical conductivity, limited specific capacity, Problems such as charge and discharge capacity and cycle stability, to achieve the effect of facilitating large-scale production and manufacturing, large specific capacity, and improving electrical conductivity

Active Publication Date: 2021-11-30
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, as a class of polyanionic materials, the conductivity of vanadium-based sodium oxofluorophosphate is very low, which greatly limits its actual specific capacity, charge-discharge capability and cycle stability, and severely restricts its application in electric vehicles and large-scale storage. Practical applications in the field of energy

Method used

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  • Vanadium-based sodium oxyfluorophosphate type sodium battery positive electrode material and preparation method thereof
  • Vanadium-based sodium oxyfluorophosphate type sodium battery positive electrode material and preparation method thereof
  • Vanadium-based sodium oxyfluorophosphate type sodium battery positive electrode material and preparation method thereof

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Embodiment 1

[0027] The positive electrode material of vanadium-based sodium oxofluorophosphate type sodium battery in this embodiment, its expression is:

[0028] Na3(VPO4)2F3 / MWNTs / C / Na3PO4.

[0029] The preparation method of the vanadium-based sodium oxyfluorophosphate sodium battery positive electrode material in this embodiment comprises the following steps:

[0030] 1. Dissolve the vanadium source, phosphorus source, sodium source and fluorine source in water according to the ratio of 1.96:1.98:3:2.94, then slowly add 5wt.% additives, stir evenly at 85°C, then vacuum dry at 120°C .

[0031] 2. In a protective atmosphere, after heat treatment at 350°C for 3h, then sintering at 650°C for 8h, pulverize, grind and sieve to obtain the target material powder, which is the high energy density vanadium-based sodium oxofluorophosphate battery material Na3( VPO4)2F3 / MWNTs / C / Na3PO4.

[0032] The vanadium source is V2O5.

[0033] The phosphorus source is NH 4 h 2 PO 4 .

[0034] The sodi...

Embodiment 2

[0040] The positive electrode material of vanadium-based sodium oxofluorophosphate type sodium battery in this embodiment, its expression is:

[0041] Na3(VO0.5PO4)2F2 / rGO / C / Na4P2O7.

[0042] The preparation method of vanadium-based oxofluorophosphate sodium type sodium battery cathode material of this example comprises the following steps:

[0043] 1. Dissolve the vanadium source, phosphorus source, sodium source and fluorine source in water according to the ratio of 1.96:2:3.02:1.96, then slowly add 6wt.% additives, stir evenly at 85°C, then vacuum dry at 110°C .

[0044] 2. In a protective atmosphere, after heat treatment at 350°C for 3h, and then sintering at 750°C for 10h, the target material powder was obtained after crushing, grinding and sieving, which is the high-energy-density vanadium-based sodium oxofluorophosphate battery material Na 3 (VO 0.5 PO 4 ) 2 f 2 / rGO / C / Na 4 P 2 o 7 .

[0045] The vanadium source is NH 4 VO 3 .

[0046] The phosphorus source...

Embodiment 3

[0053] The positive electrode material of vanadium-based sodium oxofluorophosphate type sodium battery in this embodiment, its expression is:

[0054] Na3.1(VO0.5PO4)2F2 / MWNTs / rGO / C / Na3PO4

[0055] The preparation method of vanadium-based oxofluorophosphate sodium type sodium battery cathode material of this example comprises the following steps:

[0056] 1. Dissolve the vanadium source, phosphorus source, sodium source and fluorine source in water according to the ratio of 1.96:1.98:3.098:1.96, then slowly add 8wt.% additives, stir evenly at 100°C, then vacuum dry at 150°C .

[0057] 2. In a protective atmosphere, after heat treatment at 350°C for 4h, then sintering at 650°C for 8h, pulverize, grind and sieve to obtain the target material powder, which is the high energy density vanadium-based sodium oxofluorophosphate battery material Na 3.1 (VO 0.5 PO 4 ) 2 f 2 / MWNTs / rGO / C / Na 3 PO 4 .

[0058] The vanadium source is V 2 o 5 and NH 4 VO 3 According to the molar...

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Abstract

Vanadium-based sodium oxofluorophosphate type sodium battery positive electrode material and preparation method thereof, its unified formula is expressed as: Na x (VO y PO 4 ) 2 f 3‑2y / F-C / SP, wherein, 0<x≤4, 0≤y≤1, F-C represents functional carbon material; SP represents sodium phosphate, the preparation method of positive electrode material comprises the following steps: one, vanadium source, Dissolve phosphorus source, sodium source and fluorine source in water in proportion, then add additives, stir evenly at 60-120°C, then dry in air or vacuum at 80-200°C; 2. Under protective atmosphere, dry at 200-500 After heat treatment at ℃ for 1-6 hours, then sintering at 500-800 ℃ for 2-12 hours, crushing, grinding and sieving to obtain the target material powder, the preparation process of the present invention is simple, convenient for large-scale production and manufacturing, and is conducive to promoting the production of vanadium-based sodium oxofluorophosphate The actual production and application of a series of family materials will boost the development, production, application and energy storage industry of high-performance, low-cost room temperature rechargeable sodium batteries.

Description

technical field [0001] The invention relates to a manufacturing method of the positive electrode material of a sodium battery, in particular to a long-cycle, high-energy vanadium-based sodium oxyfluorophosphate sodium battery positive electrode material and a preparation method thereof. Background technique [0002] Compared with lithium batteries, room temperature rechargeable sodium batteries have significant advantages in resources, price and safety, and have great potential to become a new, cheap and alternative product of lithium-ion batteries, showing huge technical potential and broad potential in large-scale energy storage and other fields. Application prospects. The national "13th Five-Year" strategic emerging industry development plan, the "13th Five-Year" plan for energy development and the "13th Five-Year" plan for energy technology innovation all list energy storage technology as a key research area. Sodium batteries are known for their low cost and excellent pe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/455C01B25/30C01B32/158C01B32/198H01M4/36H01M4/58H01M4/62
CPCC01B25/30C01B25/455C01B2202/06C01B2204/22C01P2002/72C01P2004/03C01P2006/40C01B32/158C01B32/198H01M4/364H01M4/5825H01M4/625Y02E60/10
Inventor 孙孝飞胡琼丹岐琳梅雪松
Owner XI AN JIAOTONG UNIV