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

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...

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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

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