A substrate-free niobium pentoxide nanosheet array negative electrode material and its preparation method and application
A niobium pentoxide and nanosheet array technology, which is applied in chemical instruments and methods, negative electrodes, inorganic chemistry, etc., can solve problems such as slow diffusion of lithium ions, improve electrochemical performance, save production costs, and increase stability. Effect
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Embodiment 1
[0031] At room temperature, dissolve niobium oxalate in 60 mL of mixed solvent a1 of deionized water and polyethylene glycol 6000 with a mass ratio of 10:3 to form a mixed solution A1. After stirring for the first time, add sodium hydroxide dropwise solution to obtain a mixed solution B1, to obtain a mixed solution B1 with a niobium ion concentration of 35 mmol / L and a sodium ion concentration of 0.19 mol / L; after the mixed solution B1 is sealed, the second stirring is performed, and after stirring for 3 hours, the mixed solution B1 is transferred Into an 80mL reactor, at 170°C, carry out hydrothermal reaction, the reaction time is 30h, after the reaction is completed, naturally cool to room temperature; move the obtained solution to a centrifuge for centrifugation, and centrifuge the obtained solid matter, successively After washing with deionized water and absolute ethanol for 3 times, drying at 110° C. for 12 hours, the substrate-free niobium pentoxide nanosheet array negati...
Embodiment 2
[0035]At room temperature, dissolve niobium chloride in 40 mL of mixed solvent a2 of deionized water and polyethylene glycol 16000 with a mass ratio of 3:7 to form a mixed solution A2. Potassium solution to obtain a mixed solution B2 with a concentration of niobium ions of 90 mmol / L and a concentration of potassium ions of 0.5 mol / L. After sealing the mixed solution B2, stir for the second time. After stirring for 0.5 h, transfer the mixed solution B2 to 80 mL In the reaction kettle, carry out hydrothermal reaction at 150°C, and the reaction time is 72h. After the reaction is completed, it is naturally cooled to room temperature, and the obtained solution is moved to a centrifuge device for centrifugation, and the centrifuged solid matter is used successively. After washing with deionized water and absolute ethanol three times respectively, drying at 150° C. for 8 hours, the substrate-free niobium pentoxide nanosheet array negative electrode material can be obtained.
Embodiment 3
[0037] At room temperature, dissolve niobium acetate in 60 mL of mixed solvent a3 of deionized water and polyvinyl alcohol 20000 with a mass ratio of 1:35 to form a mixed solution A3; after stirring for the first time, add potassium hydroxide solution dropwise Obtain mixed solution B3, obtain the niobium ion concentration and be 15mmol / L; In an 80mL reactor, conduct a hydrothermal reaction at 250°C for 6 hours. After the reaction is completed, cool it down to room temperature naturally, centrifuge, and wash the solid matter obtained by centrifugation with deionized water and absolute ethanol for 6 times. Drying at 80° C. for 16 hours can obtain the substrate-free niobium pentoxide nanosheet array negative electrode material.
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