Carbon-coated mesoporous lithium titanate anode material of lithium ion battery and method for preparing carbon-coated mesoporous lithium titanate anode material
A lithium-ion battery and negative electrode material technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve problems such as performance that cannot meet actual needs, and achieve easy control of preparation parameters, high charge and discharge capacity, and excellent electrochemical performance Effect
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Embodiment 1
[0031] Add 1.2 g of glycine to 60 mL of absolute ethanol under stirring, stir for 1 h, then let stand for 20 min to remove the precipitate, and take the upper suspension for later use. Add 3 ml of tetrabutyl titanate to the suspension under stirring, stir for 1 h, then add 0.2961 g of lithium hydroxide, and stir for 2 h. The obtained solution was poured into a reaction kettle with a capacity of 100ml, and the filling degree was 60%, and reacted in an oven at 200°C for 20h. After the reaction kettle is lowered to room temperature, the product is collected, and the product is centrifuged and washed with ethanol, and finally the washed product is put into an oven, and after drying, the original crystal of lithium titanate is obtained. The obtained lithium titanate raw crystal was calcined at 500° C. for 2 hours under nitrogen atmosphere to obtain gray lithium titanate powder. That figure 1 The X-ray diffraction pattern of the lithium titanate powder prepared in this example sho...
Embodiment 2
[0033] Add 1.2 g of glycine to 60 mL of absolute ethanol under stirring, stir for 1 h, then let stand for 20 min to remove the precipitate, and take the upper suspension for later use. Add 3 ml of tetrabutyl titanate to the suspension under stirring, stir for 1 h, then add 0.2961 g of lithium hydroxide, and stir for 2 h. The obtained solution was poured into a reaction kettle with a capacity of 100ml, and the filling degree was 60%, and reacted in an oven at 200°C for 20h. After the reaction kettle was lowered to room temperature, the product was collected, washed by centrifugation with ethanol, and dried to obtain the original crystal of lithium titanate. The obtained lithium titanate raw crystal was calcined at 300° C. for 0.5 h under a nitrogen atmosphere to obtain gray lithium titanate powder. The results of X-ray diffraction pattern show that its phase is lithium titanate with cubic spinel structure. Through elemental analysis, its carbon content is 0.8%. By electron p...
Embodiment 3
[0035] Add 0.02g of lysine to 60mL of isopropanol under stirring, stir for 1h, slowly add 1.5ml of tetrabutyl titanate dropwise into the suspension under stirring, stir for 1h, then add 0.2432g of lithium nitrate, Stir for 2h. The obtained solution was poured into a reaction kettle with a capacity of 100ml, and the filling degree was 80%, and reacted in an oven at 150°C for 72h. After the reaction kettle was lowered to room temperature, the product was collected, washed by centrifugation with ethanol, and dried to obtain the original crystal of lithium titanate. The obtained primary crystal of lithium titanate was calcined at 900° C. for 72 hours under nitrogen atmosphere to obtain gray lithium titanate powder. The results of X-ray diffraction pattern show that its phase is lithium titanate with cubic spinel structure. Through elemental analysis, its carbon content is 0.5%. By electron paramagnetic resonance spectroscopy, it can be seen that the sample has oxygen vacancies ...
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