A kind of preparation method of nanoscale lithium ion battery negative electrode material lithium titanate
A technology of lithium ion battery and negative electrode material, applied in battery electrodes, titanate, nanotechnology, etc., to achieve the effects of excellent electrochemical performance, easy industrial production, and uniform composition
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[0027] A preparation method of nanoscale lithium ion battery negative electrode material lithium titanate, the method comprises the following steps:
[0028] (1) Mix the titanium source, dispersant, and deionized water to form a titanium-containing solution, hydrolyze it under stirring, and collect the product by centrifugation;
[0029] (2) Add the product obtained by centrifugation into the lithium-containing solution and mix evenly to carry out a liquid phase reaction. The temperature of the liquid phase reaction is 30-100°C, and the reaction time of the liquid phase reaction is 2-30 days. The precipitate generated after the reaction It is a lithium titanate precursor, wherein the molar ratio of Li to Ti is 4:5-5:1;
[0030] (3) The lithium titanate precursor obtained in step (2) is heated to 450-700°C at a rate of 2-10°C / min, then calcined at 450-700°C for 2-10 hours, and then naturally cooled to room temperature to obtain nano Lithium titanate, a negative electrode mater...
Embodiment 1
[0035] Choose lithium hydroxide as the lithium source, tetrabutyl titanate as the titanium source, and ethanol as the dispersant. According to the molar ratio of Li and Ti of 1:1, mix 0.004mol tetrabutyl titanate, 20mL ethanol, and 2mL water evenly Form a titanium-containing solution, hydrolyze under stirring, and collect the hydrolyzate by centrifugation; add the hydrolyzate to the lithium-containing solution and mix evenly, wherein the lithium-containing solution is obtained by dissolving 0.004mol lithium hydroxide in 20mL water; react at 60°C for 7 days to generate lithium titanate Precursor: The obtained lithium titanate precursor was heated up to 550°C at a rate of 3°C / min and kept at a constant temperature for 6 hours, and then naturally cooled to room temperature to obtain lithium titanate, a negative electrode material for a nanoscale lithium ion battery.
[0036] The XRD figure of the nanoscale lithium ion battery negative electrode material lithium titanate that the p...
Embodiment 2
[0039] Choose lithium acetate as the lithium source, tetraethyl titanate as the titanium source, and acetone as the dispersant. According to the molar ratio of Li and Ti of 0.8:1, mix 0.004mol tetraethyl titanate, 20mL acetone, and 2mL water evenly to form The titanium-containing solution is hydrolyzed under stirring, and the hydrolyzate is collected by centrifugation; the hydrolyzate is added to the lithium-containing solution and mixed evenly, and the lithium-containing solution is obtained by dissolving 0.0032mol lithium acetate in 20mL water; react at 40°C for 10 days to form a lithium titanate precursor ; The obtained lithium titanate precursor was heated to 700° C. at a rate of 10° C. / min and kept at a constant temperature for 2 hours, and then naturally cooled to room temperature to obtain lithium titanate, a negative electrode material for a nanoscale lithium ion battery.
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