Sea urchin-like lithium titanate microsphere preparation method
A lithium titanate, sea urchin-shaped technology, applied in the field of preparation of sea urchin-shaped lithium titanate microspheres, can solve the problems of fast capacity decay and low conductivity of lithium titanate, and achieve high discharge specific capacity and excellent rate cycle performance. Effect
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[0037] Example 1:
[0038] (1) Add titanium metal powder to a 5mol / L sodium hydroxide solution, where the amount of titanium metal powder added is 0.1g / L, magnetically stir for 1-100 minutes, and then transfer the mixed solution to polytetrafluoroethylene In a stainless steel reaction kettle lined, sealed and placed in an oven for hydrothermal reaction at 80-220°C for 1-48 hours.
[0039] (2) After the reaction, cool to room temperature, centrifuge the obtained precipitate, wash to pH 7.0, and then dry the precipitate in an oven at 60-90° C. to obtain the titanium dioxide precursor.
[0040] (3) Weigh a certain amount of lithium nitrate according to the atomic ratio Li / Ti=0.8-1.3, and add it to the mixture of ethanol and deionized water together with the titanium dioxide precursor obtained in step (2) (the ratio of ethanol and deionized water) The volume ratio is 1:2-3:1), magnetically stirred for 1-100 minutes, and then the obtained emulsion is transferred to a stainless steel reac...
Example Embodiment
[0044] Example 2:
[0045] (1) Add titanium metal powder to a 7mol / L sodium hydroxide solution, where the amount of titanium metal powder added is 0.2g / L, magnetically stir for 1-60 minutes, and then transfer the mixed solution to the polytetrafluoroethylene The lining stainless steel reactor is sealed and placed in an oven for hydrothermal reaction at 100-220°C for 1-36 hours.
[0046] (2) After the reaction, cool to room temperature, centrifuge the obtained precipitate, wash to pH 7.0, and then dry the precipitate in an oven at 70-90° C. to obtain a titanium dioxide precursor.
[0047] (3) Weigh a certain amount of lithium acetate according to the atomic ratio Li / Ti = 0.8-1.2, and add it to the mixture of ethanol and deionized water together with the titanium dioxide precursor obtained in step (2) (the ratio of ethanol and deionized water) The volume ratio is 1:3-3:1), magnetically stirred for 5-100 minutes, and then the obtained emulsion is transferred to a stainless steel reacti...
Example Embodiment
[0050] Example 3:
[0051] (1) Add titanium metal powder to a 5mol / L sodium hydroxide solution, where the amount of titanium metal powder added is 0.2g / L, magnetically stir for 5-60 minutes, and then transfer the mixed solution to polytetrafluoroethylene The lining stainless steel reactor is sealed and placed in an oven for hydrothermal reaction at 100-200°C for 1-30 hours.
[0052] (2) After the reaction, cool to room temperature, centrifuge the obtained precipitate, wash to pH 7.0, and then dry the precipitate in an oven at 70-85° C. to obtain a titanium dioxide precursor.
[0053] (3) Weigh a certain amount of lithium hydroxide according to the atomic ratio Li / Ti=0.8-1.1, and add it to the mixture of ethanol and deionized water together with the titanium dioxide precursor obtained in step (2) (ethanol and deionized water The volume ratio is 1:3-2:1), magnetically stirred for 5-80 minutes, and then transfer the obtained emulsion to a stainless steel reaction kettle lined with poly...
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