Lithium and sodium ion battery negative electrode material nickel pyrovanadate and sol-gel combined annealing preparation method and application thereof

A sodium ion battery, nickel pyrovanadate technology, applied to battery electrodes, negative electrodes, nickel compounds, etc., can solve the problems of increasing the difficulty of sodium ion de-intercalation, unfavorable large-scale production, unfavorable large-scale production, and the like. The reaction process is easy to control, the production cost is reduced, and the reaction time is shortened

Inactive Publication Date: 2021-06-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although sodium-ion batteries have the characteristics of low cost and high safety, compared with lithium-ion batteries, the radius of sodium ions is much larger, which increases the difficulty of sodium ions in the electrode material, resulting in lower specific capacity and reversible Poor cycle performance, urgent need for new electrode materials for sodium-ion batteries to meet the growing energy demand
In the preparation of new lithium and sodium ion battery anode materials, there are many problems in the existing technology, the process is cumbersome and complicated, the pollution is high, the sample purity is not high, and the shape consistency is poor, which is not conducive to commercial large-scale production
For example, the preparation of the three-porous multi-dimensional biomass silicon / carbon composite negative electrode material needs to be soaked in boiling hydrochloric acid for many times, washed with deionized water and ethanol repeatedly, and the organic solvents vinylidene fluoride and N-methylpyrrolidone are toxic. It needs to be annealed multiple times under air atmosphere and argon atmosphere, the process is cumbersome and highly polluting, which is not conducive to large-scale production

Method used

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  • Lithium and sodium ion battery negative electrode material nickel pyrovanadate and sol-gel combined annealing preparation method and application thereof
  • Lithium and sodium ion battery negative electrode material nickel pyrovanadate and sol-gel combined annealing preparation method and application thereof
  • Lithium and sodium ion battery negative electrode material nickel pyrovanadate and sol-gel combined annealing preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0044] After weighing ammonium metavanadate, citric acid and nickel nitrate hexahydrate according to the stoichiometric ratio of V:C:Ni=1:1:1, first add ammonium metavanadate to 50°C distilled water, then add citric acid to set Stir on a magnetic stirrer for half an hour, then add nickel nitrate hexahydrate and continue stirring at 60°C for 3 hours to obtain a colloid; put the obtained colloid in an air drying oven at 110°C to dry and air-dry, after 12 hours Get precursors. Grind the precursor and press it into a dense thin disc with a thickness of 0.5mm, then pretreat it at 300°C for 6h under an inert gas atmosphere, and after natural cooling, grind to obtain a powder product; grind the powder product again Afterwards, it is pressed again to be a dense thin disc with a thickness of 0.5 mm, put into a tube furnace and sinter 20 h at 650 ° C under an Ar atmosphere, and after natural cooling, a pure-phase nickel pyrovanadate negative electrode material (such as figure 1 shown)....

Embodiment 2

[0050] After weighing vanadium pentoxide, citric acid and nickel acetate according to the stoichiometric ratio of V:C:Ni=1:2:1, first add vanadium pentoxide to distilled water at 55°C, then add citric acid and place in a magnetic Stir on the stirrer for half an hour, then add nickel acetate and continue stirring at 60°C for 3 hours to obtain a colloid; put the obtained colloid in an air drying oven at 110°C to dry and air-dry, and obtain a precursor after 12 hours. Grind the precursor and press it into a dense thin disc with a thickness of 0.6mm, and then pretreat it at 400°C for 5.5h under an inert gas atmosphere, and after natural cooling, a powdery product is obtained; the powdery product is ground again Afterwards, it was pressed again into a dense thin disc with a thickness of 0.6 mm, put into a tube furnace and sintered at 900° C. for 10 h under an Ar atmosphere, and cooled naturally to obtain a nickel pyrovanadate negative electrode material.

[0051] The XRD pattern of...

Embodiment 3

[0053] After weighing vanadium pentoxide, glucose and nickel nitrate according to the stoichiometric ratio of V:C:Ni=2:1:2, first add vanadium pentoxide to distilled water at 60°C, then add glucose and place in a magnetic stirrer Stir for half an hour, then add nickel nitrate and continue stirring at 60°C for 3 hours to obtain a colloidal body; put the obtained colloidal body in an air drying oven at 110°C to dry and air-dry, and obtain a precursor after 12 hours. Grind the precursor and press it into a dense thin disc with a thickness of 0.8mm, and then pretreat it at 450°C for 5 hours under an inert gas atmosphere, and after natural cooling, a powdery product is obtained; after grinding the powdery product again Press again to form a dense thin disc with a thickness of 0.8 mm, put it into a tube furnace for sintering at 750° C. for 18 hours under an Ar atmosphere, and obtain a nickel pyrovanadate negative electrode material after natural cooling.

[0054] The XRD pattern of ...

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Abstract

The invention discloses a lithium and sodium ion battery negative electrode material nickel pyrovanadate and a sol-gel combined annealing preparation method and application thereof. The method comprises the following steps: dissolving a vanadium source in distilled water, heating to 50-60 DEG C, adding a chelating agent, stirring until the chelating agent is completely dissolved, adding a nickel source, and stirring and heating at 60 DEG C to obtain a colloid; drying to obtain dry colloid; grinding the dry colloid, tabletting, sintering in an inert atmosphere at 300-450 DEG C for 5-6 hours, naturally cooling, and grinding to obtain a powdery material; and grinding and tabletting the powdery material again, sintering for 10-20 hours at the temperature of 650-900 DEG C in an inert atmosphere, and naturally cooling to obtain the nickel pyrovanadate negative electrode material. The material obtained by the method is uniform in particle and stable in structure, and shows excellent electrochemical performance. The method is suitable for producing the high-performance lithium ion and sodium ion battery negative electrode material nickel pyrovanadate [Ni2V2O7].

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium and sodium ion batteries, and in particular relates to a preparation method and application of nickel pyrovanadate, a negative electrode material for lithium and sodium ion batteries, and sol-gel combined annealing thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products and small electrical appliances, especially in new energy vehicles, large energy storage power stations, and aerospace fields, which have brought huge economic effects and broad application prospects. Lithium-ion batteries have many advantages, such as high energy density, good rate performance, long cycle life, wide operating temperature range, low self-discharge rate, light weight, low internal resistance, environmental protection and no pollution. [0003] The development history of lithium-ion batteries is mainly divided into the following sta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/58H01M10/054
CPCC01G53/00C01P2002/72C01P2004/01C01P2006/40H01M4/58H01M10/054H01M2004/027Y02E60/10
Inventor 董有忠周智勇赵彦明范庆华
Owner SOUTH CHINA UNIV OF TECH
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