A kind of lithium titanate negative electrode material and preparation method thereof
A negative electrode material, lithium titanate technology, applied in battery electrodes, structural parts, electrical components, etc., can solve the problems of complex process, capacity decay, poor electronic conductivity, etc., and achieve good rate performance, high discharge capacity, and improved electrical conductivity. sexual effect
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Embodiment 1
[0042]This embodiment provides a lithium titanate negative electrode material, the preparation method of which includes the following steps: cutting the nickel foam into a 2*2 square, ultrasonically treating it in 0.1M nitric acid and acetone solutions for 15 minutes, and then using deionized water Wash 3 times, dry at 60°C for later use; measure and mix 35mL n-propanol and 8mL glycerin to obtain mixed solution A, add 200mg of PVP to mixed solution A, stir magnetically and add 3mL tetrabutyl titanate and 2.2 g lithium acetate dihydrate, magnetically stirred evenly to obtain mixed solution B; transfer mixed solution B and nickel foam to a 100mL reactor, heated to 150°C for 15 hours, cooled the reaction system, centrifuged and dried to obtain titanium foam loaded with nickel Lithium oxide precursor; put the lithium titanate precursor into a tube furnace, pass in argon, and set the temperature parameters as follows: raise the temperature at 5°C / min to 450°C and keep it for 5 hours...
Embodiment 2
[0046] This example provides a lithium titanate negative electrode material. The difference between its preparation method and Example 1 is that in the solvothermal process, 43 mL of n-propanol is used instead of 35 mL of n-propanol and 8 mL of glycerin to obtain a mixed solution A.
[0047] The lithium titanate precursor obtained in this embodiment was characterized by scanning electron microscopy, and the results were as follows Figure 5 shown. It can be seen from the figure that the product obtained by the solvothermal method using propanol as a solvent is a spherical structure with a relatively smooth surface. Compared with materials with rambutan morphology, the lithium ion transport path is longer and the specific surface area is larger.
Embodiment 3
[0049] This embodiment provides a lithium titanate negative electrode material. The difference between its preparation method and that of Embodiment 1 is that segmental calcination is not used in the calcination process, and the calcination temperature is 900° C. for 8 hours.
[0050] Using X-ray diffractometer and scanning electron microscope to characterize the target product, the results are as follows Figure 6 and Figure 7 shown. It can be seen from the figure that the structure of the lithium titanate material without segmental sintering is pure spinel structure lithium titanate, not the two-phase structure of titanium dioxide and lithium titanate, but the morphology and segmental sintering The difference is not big, because the shape of the precursor is the same and stable, and the heat treatment basically has no effect on the shape.
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