A rare earth metal-doped micro-nano lithium titanate negative electrode material and preparation method thereof
A technology of micro-nano lithium titanate and negative electrode materials, applied in chemical instruments and methods, nanotechnology for materials and surface science, battery electrodes, etc., can solve electrolyte consumption, low initial Coulombic efficiency, and insufficient long-term cycle performance Ideal, safety issues and other issues, to achieve the effect of excellent high-rate discharge characteristics
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Embodiment 1
[0024] Take 100ml of absolute ethanol and add it into a 250ml three-neck flask, add 0.4ml of 0.1M PEG1000 solution into it, and then slowly add 2ml of isopropyl titanate dropwise into it. Access to N 2 , under the state of stirring, react for 2 hours, stand still for 8 hours, filter to obtain white precipitate, use absolute ethanol to wash the precipitate three times, and dry it in a vacuum oven at 60°C to prepare spherical titanium dioxide precursor. Weigh 0.15g of titanium dioxide precursor, add it to 15ml of ethanol and water mixed solution (3:2 volume ratio), and then add 0.065g of LiOH·H 2 O and 0.0286g of cerium nitrate (analytically pure), after stirring for 15min, transferred to a 50ml hydrothermal reaction kettle, reacted at 180°C for 5h, obtained a powdery product, and put it into a muffle furnace for 1 hour at 500°C to prepare A pure-phase lithium titanate powder with micro-nano structure is obtained. figure 1 is the XRD pattern of the obtained sample. It can be ...
Embodiment 2
[0026] Take 100ml of absolute ethanol and add it into a 250ml three-necked flask, add 0.4ml of 0.1M PEG10000 solution into it, and then slowly add 2ml of butyl titanate dropwise into it. Access to N 2 , in the state of stirring, reacted for 4 hours, stood still for 2 hours, filtered to obtain a white precipitate, washed the precipitate three times with absolute ethanol, and dried it in a vacuum oven at 60° C. to prepare a spherical titanium dioxide precursor. Weigh 0.15g of titanium dioxide precursor, add it to 15ml of ethanol and water mixed solution (4:1 volume ratio), and then add 0.0629g of LiOH·H 2 O and 0.0222g of samarium nitrate (analytically pure), after stirring for 15min, transferred to a 50ml hydrothermal reaction kettle, reacted at 150°C for 12h, obtained a powdery product, put it into a muffle furnace and kept it warm for 4 hours at 450°C to prepare A pure-phase lithium titanate powder with micro-nano structure is obtained. figure 2 is the FESEM image of the s...
Embodiment 3
[0028] Take 100ml of absolute ethanol and add it into a 250ml three-neck flask, add 0.4ml of 0.1M PEG1500 solution into it, and then slowly add 2ml of butyl titanate dropwise into it. Access to N 2 , in the state of stirring, react for 1 h, stand still for 10 h, filter to obtain a white precipitate, use absolute ethanol to wash the precipitate three times, and dry it in a vacuum oven at 60° C. to prepare a spherical titanium dioxide precursor. Weigh 0.15g of titanium dioxide precursor, add it to 15ml of ethanol and water mixed solution (2:3 volume ratio), and then add 0.064g of LiOH·H 2 O and 0.023g of dysprosium nitrate (analytically pure), after stirring for 15min, transferred to a 50ml hydrothermal reaction kettle, reacted at 190°C for 4h, obtained a powdery product, and put it into a muffle furnace for 3 hours at 450°C to prepare A pure-phase lithium titanate powder with micro-nano structure is obtained. image 3 In order to use the material as the positive electrode and...
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