Lithium titanate material and preparation method thereof, electrode pole piece and battery using same
A technology of lithium titanate and lithium source, applied in the directions of titanate, secondary battery, battery electrode, etc., can solve the problems of complex preparation process, poor cycle performance of lithium titanate material, and high energy consumption, and achieve simple preparation process, high energy consumption, etc. Stable cycle performance and low energy consumption
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[0024] see figure 1 , the preparation method of lithium titanate material of the present invention, this lithium titanate material is mainly used in the electrode (not shown in figure) of lithium ion battery, and it comprises the following steps:
[0025] Step S1, mixing a titanium compound with a solution containing peroxide ions to obtain a precursor solution A.
[0026] Specifically, the peroxide and the solvent are uniformly mixed according to a preset ratio to obtain a mixed solution, and then the titanium compound is added into the mixed solution and stirred to completely dissolve the titanium compound to obtain the precursor solution A. The ratio of the amount of the substance of the peroxide to the amount of the substance of the titanium element in the titanium compound is greater than or equal to 1:1.
[0027] Wherein, the peroxide is hydrogen peroxide. The solvent can be water, preferably distilled water, deionized water, high-purity water or ultra-pure water. The...
Embodiment 1
[0038] Mix 28ml of deionized water and 16ml of hydrogen peroxide with a mass fraction of 20% to 30% evenly to obtain a mixed solution.
[0039] Add 0.5 g of titanium nitride into the above mixed solution, stir to dissolve it completely, and obtain precursor solution A.
[0040] Add 50ml of isopropanol with a mass fraction of 99.9% and 100ml of deionized water into the above precursor solution A and mix evenly, then add 0.3g of lithium fluoride and mix evenly to completely dissolve lithium fluoride to obtain a light yellow milky precursor body solution B.
[0041] Precursor solution B was placed at 80° C. for 24 hours to dry precursor solution B to obtain a white lithium titanate precursor.
[0042] The lithium titanate precursor was placed in a furnace and sintered at 750° C. for 7 hours under an argon protective atmosphere. Then naturally cool down to room temperature with the furnace temperature to obtain the lithium titanate material, which is micron spherical lithium titan...
Embodiment 2
[0044] 40 mL of deionized water and 12 mL of hydrogen peroxide with a mass fraction of 20% to 30% were uniformly mixed to obtain a mixed solution.
[0045] Add 0.25 g of titanium carbide into the above mixed solution, stir to completely dissolve the titanium carbide, and obtain precursor solution A.
[0046] Add 100ml of isopropanol with a mass fraction of 99.9% and 100ml of deionized water into the above precursor solution A and mix evenly, then add 0.3g of lithium hydroxide and mix evenly to completely dissolve the lithium hydroxide to obtain a pale yellow milky precursor body solution B.
[0047] Precursor solution B was placed at 80° C. for 36 hours to dry precursor solution B to obtain a white lithium titanate precursor.
[0048] The lithium titanate precursor was placed in a furnace and sintered at 700° C. for 5 hours under an argon protective atmosphere. Then naturally cool down to room temperature with the furnace temperature to obtain the lithium titanate material, ...
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