Niobium pentoxide coated graphite composite negative electrode material and preparation method thereof
A technology of niobium pentoxide and negative electrode materials, which is applied in the field of electrochemical devices, can solve the problems of inability to improve the fast charging ability of graphite and low electronic conductivity, achieve excellent cycle stability, simple method, and improve cycle stability and rate performance effect
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Embodiment 1
[0036] A) In the glove box, weigh 0.10164g (0.00037621mol) of niobium pentachloride (relative molecular mass: 270.17), dissolve it in 20mL of absolute ethanol, and stir at room temperature for 0.5h to form a niobium alcohol solution;
[0037] B) Add 5 ml of deionized water dropwise to the niobium alcohol solution prepared in step A), stir for 1 hour, and disperse evenly to form a mixed solvent;
[0038] C) To the mixed solvent prepared in step B), add 5g of graphite (this coating amount is 1wt% coating, denoted as Gr@1-Nb 2 O 5 ), graphite is spherical particles of 5~15μm, stir for 1h, disperse evenly, at 75°C in a water bath, heat and stir for 2h, stirring speed is 300r / min, until the solvent is evaporated to dryness, put into a 70°C oven to dry, ground into powder;
[0039] D) Sintering the powder obtained in step C) in a tube furnace, in an argon atmosphere, at a heating rate of 5°C / min to 800°C, sintering for 2.5h to obtain niobium pentoxide-coated graphite Composite an...
Embodiment 2
[0041] A) In the glove box, weigh 0.5082g (0.00188104mol) of niobium pentachloride (relative molecular mass 270.17), dissolve it in 20mL of absolute ethanol, stir at room temperature for 0.5h to form a niobium alcohol solution;
[0042] B) Add 5 ml of deionized water dropwise to the niobium alcohol solution prepared in step A), stir for 1 hour, and disperse evenly to form a mixed solvent;
[0043] C) To the mixed solvent prepared in step B), add 5g of graphite (this coating amount is 5wt% coating, denoted as Gr@5-Nb 2 O 5 ), the graphite is spherical particles of 5-15 μm, stirred for 1h, dispersed evenly, heated and stirred for 2h in a water bath at 70°C, stirring at a speed of 400r / min, until the solvent was evaporated to dryness, put into a 50°C oven to dry, ground into powder;
[0044] D) Sintering the powder obtained in step C) in a tube furnace, in an argon atmosphere, at a heating rate of 2°C / min to 700°C, and sintering for 3h to obtain a niobium pentoxide-coated graph...
Embodiment 3
[0046]A) In the glove box, weigh 1.0164g (0.00376208mol) of niobium pentachloride (relative molecular mass: 270.17), dissolve it in 20mL of absolute ethanol, and stir at room temperature for 0.5h to form a niobium alcohol solution;
[0047] B) Add 5 ml of deionized water dropwise to the niobium alcohol solution prepared in step A), stir for 1 hour, and disperse evenly to form a mixed solvent;
[0048] C) To the mixed solvent prepared in step B), add 5g of graphite (this coating amount is 10wt% coating, denoted as Gr@10-Nb 2 O 5 ), the graphite is spherical particles of 5-15 μm, stirred for 1h, dispersed evenly, heated and stirred for 2h in a water bath at 80°C, stirring at a speed of 600r / min, until the solvent was evaporated to dryness, put into an 80°C oven to dry, ground into powder;
[0049] D) Sintering the powder obtained in step C) in a tube furnace, in an argon atmosphere, at a heating rate of 10°C / min to 800°C, sintering for 3h to obtain a niobium pentoxide-coated g...
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