Preparation method of fluorine and nitrogen co-doped carbon-coated lithium titanate nanosheets
A technology of carbon-coated lithium titanate and nanosheets, applied in electrical components, electrochemical generators, battery electrodes, etc. Chemical properties and other issues, to achieve the effect of improving electrochemical performance, uniform morphology, and increasing electrical conductivity
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Embodiment 1
[0025] 1) Take 0.168 g of lithium hydroxide monohydrate, 1.7 g of tetrabutyl titanate, 0.015 g of lithium fluoride, and 20 mL of absolute ethanol in a 100 mL three-necked flask, stir for 12 hours in a dry environment, and then add After 25 mL of deionized water was vigorously stirred for 0.5 h, the milky white solution was placed in a 50 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at 180 °C for 36 h. The white powder deposited in the reactor was taken out, washed with absolute ethanol three times, centrifuged, and dried in an oven at 60 °C for 8 h to obtain a fluorine-doped lithium titanate precursor.
[0026] The fluorine-doped lithium titanate precursor was placed in a tube furnace and calcined at 500° C. for 8 h under the protection of an argon atmosphere to obtain fluorine-doped lithium titanate nanosheets.
[0027] 2) Take 1g of fluorine-doped lithium titanate nanosheets, 0.125g of dopamine, and tris(hydroxymethyl)aminomethane solution and...
Embodiment 2
[0030] 1) Take 0.165 g lithium hydroxide monohydrate, 1.5 g tetrabutyl titanate, 0.010 g lithium fluoride, and 20 mL absolute ethanol in a 100 mL three-necked flask, stir for 12 hours in a dry environment, and then add 25 mL After stirring vigorously with deionized water for 0.5 h, the milky white solution was placed in a 50 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at 150 °C for 20 h. The white powder deposited in the reactor was taken out, washed with absolute ethanol three times, centrifuged, and dried in an oven at 60 °C for 8 h to obtain a fluorine-doped lithium titanate precursor.
[0031] The fluorine-doped lithium titanate precursor was placed in a tube furnace and calcined at 700° C. for 5 h under the protection of an argon atmosphere to obtain fluorine-doped lithium titanate nanosheets.
[0032] 2) Take 0.5g of fluorine-doped lithium titanate nanosheets, 0.1g of dopamine, and tris(hydroxymethyl)aminomethane solution and stir in a wa...
Embodiment 3
[0035] 1) Take 0.204 g of lithium hydroxide monohydrate, 1.7 g of tetrabutyl titanate, 0.005 g of lithium fluoride, and 20 mL of absolute ethanol in a 100 mL three-necked flask, stir for 12 hours in a dry environment, and then add After 25 mL of deionized water was vigorously stirred for 0.5 h, the milky white solution was placed in a 50 mL polytetrafluoroethylene stainless steel reactor for hydrothermal reaction at 220 °C for 12 h. The white powder deposited in the reactor was taken out, washed with absolute ethanol three times, centrifuged, and dried in an oven at 60° C. for 8 hours to obtain a fluorine-doped lithium titanate precursor.
[0036] The fluorine-doped lithium titanate precursor was placed in a tube furnace under the protection of an argon atmosphere and calcined at 800° C. for 2 h to obtain fluorine-doped lithium titanate nanosheets.
[0037] 2) Take 1 g of fluorine-doped lithium titanate nanosheets, 0.25 g of dopamine, and tris(hydroxymethyl)aminomethane and st...
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