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Preparation method and application of Ni/Zn pre-embedded dication layered vanadium oxide

A technology of double cations and vanadium oxides, applied in chemical instruments and methods, vanadium oxide, nickel compounds, etc., can solve the problems of capacity, rate performance, cycle stability and other incompatibility, and achieve simple and effective synthesis methods and improved structure Stability, effect of increasing electrochemical reaction sites

Pending Publication Date: 2022-06-24
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the incompatibility of pre-embedded single cation layered vanadium oxide sodium ion battery negative electrode materials in terms of capacity, rate performance, and cycle stability, the present invention provides a pre-embedded Ni / Zn double cation layered vanadium oxide The preparation method and application of the compound to optimize the sodium storage comprehensive performance of layered vanadium oxide

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  • Preparation method and application of Ni/Zn pre-embedded dication layered vanadium oxide
  • Preparation method and application of Ni/Zn pre-embedded dication layered vanadium oxide
  • Preparation method and application of Ni/Zn pre-embedded dication layered vanadium oxide

Examples

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Embodiment 1

[0031] Example 1: Pre-intercalation of Ni / Zn double cation layered vanadium oxide Ni 0.11 Zn 0.13 V 2 O 5 ·nH 2 Preparation of O

[0032] First, weigh 0.095g of nickel acetate tetrahydrate and fully dissolve it in 26.9mL of deionized water; then continue to weigh 0.084g of zinc acetate dihydrate into the above solution, stir and dissolve; weigh 0.210g of vanadium pentoxide, put it in the above solution Stir and disperse evenly; slowly add 1.7 mL of acetone dropwise to the above solution under magnetic stirring conditions, and after stirring for 5 min, pour the above solution into the Teflon liner of the hydrothermal reactor, move it to the oven, and heat to 200 ℃ and kept the reaction for 72h; after natural cooling, the precipitate collected in the inner liner of the hydrothermal reaction kettle was filtered, washed (three times with deionized water, once with isopropanol), dried, and then placed in a vacuum drying at 60℃. Dry in an oven for 8-10 hours to obtain pre-embed...

Embodiment 2

[0034] Example 2: Pre-Embedded Monocationic Layered Vanadium Oxide Zn 0.25 V 2 O 5 ·nH 2 O (corresponding to Ni x Zn y V 2 O 5 ·nH 2 Preparation of the case where x=0 in O)

[0035] First, weigh 0.167g of zinc acetate dihydrate and fully dissolve it in 26.9mL of deionized water; stir and dissolve; weigh 0.210g of vanadium pentoxide, stir and disperse evenly in the above solution; under magnetic stirring conditions, add 1.7mL of acetone Slowly add it dropwise to the above solution, after stirring for 5 minutes, pour the above solution into the Teflon liner of the hydrothermal reaction kettle, move it to the oven, heat it to 200 ° C and keep the reaction for 72 hours; after natural cooling, the hydrothermal The precipitate collected in the inner liner of the reaction kettle is filtered, washed (three times with deionized water and once with isopropanol), dried and placed in a vacuum drying oven at 60°C for 8 to 10 hours to obtain a pre-embedded monocationic layer. Vanad...

Embodiment 3

[0037] Example 3: Pre-intercalation of mono-cationic layered vanadium oxide Ni 0.25 V 2 O 5 ·nH 2 O (corresponding to Ni x Zn y V 2 O 5 ·nH 2 Preparation of the case where y=0 in O)

[0038] First, weigh 0.189g of nickel acetate tetrahydrate and fully dissolve it in 26.9mL of deionized water; stir to dissolve; weigh 0.210g of vanadium pentoxide, stir and disperse evenly in the above solution; under magnetic stirring conditions, add 1.7mL of acetone It was slowly added dropwise to the above solution, and after stirring for 5 minutes, the above solution was poured into the Teflon liner of the hydrothermal reaction kettle, moved to the oven, heated to 200° C. and kept reacting for 72 hours. After natural cooling, the precipitate collected in the inner liner of the hydrothermal reaction kettle was filtered, washed (deionized water three times, isopropanol once), dried, and then placed in a vacuum drying oven at 60 °C for 8 to 10 hours. , to obtain pre-intercalated mono-ca...

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Abstract

The invention discloses a preparation method and application of a pre-embedded Ni / Zn dication layered vanadium oxide, the pre-embedded Ni / Zn dication layered vanadium oxide is obtained through a one-step hydrothermal reaction of a Ni / Zn metal salt precursor and vanadium pentoxide, and the ratio of Ni to Zn is regulated and controlled by changing the adding ratio of the metal ion precursor. The chemical formula of the obtained pre-embedded Ni / Zn dication layered vanadium oxide is Ni < x > Zn < y > V < 2 > O < 5 >. NH < 2 > O. According to the pre-embedded dication layered vanadium oxide, the capacity supply effect of high electronegativity cations (Ni ions), the pillared effect of Zn ions on a layered structure in the circulation process and the large interlayer spacing of the material are combined; the problem that the pre-embedded monocation layered vanadium oxide negative electrode material cannot be compatible in multiple aspects such as capacity, rate capability and cycling stability is solved, and the comprehensive performance of the layered vanadium-based sodium-ion battery negative electrode material is further improved.

Description

technical field [0001] The invention belongs to the field of modification methods for negative electrode materials of sodium ion batteries, in particular to a preparation method and application of a pre-embedded Ni / Zn double cation layered vanadium oxide. Background technique [0002] In recent years, with the aggravation of environmental problems, the demand for renewable energy is increasing, and its efficient storage has gradually become an urgent problem to be solved. The development of low-cost, high-performance grid-scale energy storage technology has become the top priority to solve this problem. In this context, sodium-ion batteries have become one of the important candidates for large-scale energy storage due to their abundant sodium resources and low cost. In addition, compared with the copper foil used in the negative electrode current collector of lithium ion batteries, the sodium ion battery can use aluminum foil with lower cost as the negative electrode curren...

Claims

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Application Information

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IPC IPC(8): C01G31/02C01G53/00H01M4/36H01M4/48H01M4/52H01M10/054
CPCC01G31/02C01G53/006H01M10/054H01M4/366H01M4/48H01M4/52H01M2004/027C01P2002/72C01P2002/85C01P2004/03C01P2004/04C01P2004/61C01P2006/40Y02E60/10
Inventor 黄海舰魏丽张卫新杨则恒
Owner HEFEI UNIV OF TECH
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