In-situ generation of lithium titanate-titanium dioxide composite material and its preparation method
A technology of titanium dioxide and composite materials, applied in the field of in-situ generation of lithium titanate-titanium dioxide composite materials and its preparation, can solve the problems of carbonate solvolysis, affecting application, poor mixing uniformity of lithium titanate, etc.
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Embodiment 1
[0027] A method for preparing lithium titanate-titanium dioxide composite material in situ, comprising the steps of:
[0028] 1) adding titanium dioxide to 10 mol / l sodium hydroxide solution, in a hydrothermal reaction kettle, keeping the temperature at 180° C. for 48 hours to obtain material I;
[0029] Wherein the mol ratio of titanium dioxide and sodium hydroxide is 1:6;
[0030] 2) Add material I to 0.4mol / L [H + ] in the hydrochloric acid solution, wherein material I / acid solution=1g / 200ml, the reaction time is 48h, obtain ion exchange solution I;
[0031] 3) Put the ion exchange solution I into a high-speed centrifuge for washing and separation, collect the solids, and obtain the material II;
[0032] 4) Add the material II to a 1mol / l lithium hydroxide solution, mix well, add it to a hydrothermal reactor, and keep it warm at 150°C for 24 hours to obtain the ion replacement solution II;
[0033] 5) Wash and separate the ion exchange solution II in a high-speed centrif...
Embodiment 2
[0040] A method for preparing lithium titanate-titanium dioxide composite material in situ, comprising the steps of:
[0041] 1) adding titanium dioxide to 10 mol / l sodium hydroxide solution, in a hydrothermal reaction kettle, keeping the temperature at 210° C. for 18 hours to obtain material I;
[0042] Wherein the mol ratio of titanium dioxide and sodium hydroxide is 1:12;
[0043] 2) Add material I to 0.8mol / L [H + ] in the hydrochloric acid solution, wherein material I / acid solution=1g / 100ml, the reaction time is 12h, obtain ion replacement solution I;
[0044] 3) Put the ion exchange solution I into a high-speed centrifuge for washing and separation, collect the solids, and obtain the material II;
[0045] 4) Add the material II to a 2mol / l lithium hydroxide solution, mix it evenly, add it into a hydrothermal reactor, and keep it at 200°C for 12 hours to obtain the ion replacement solution II;
[0046] 5) Wash and separate the ion exchange solution II in a high-speed c...
Embodiment 3
[0053]1) adding titanium dioxide to 10mol / l sodium hydroxide solution, in a hydrothermal reaction kettle, keeping the temperature at 200°C for 36h to obtain material I;
[0054] Wherein the mol ratio of titanium dioxide and sodium hydroxide is 1:18;
[0055] 2) Add material I to 0.8mol / L [H + ] in the sulfuric acid solution, wherein material I / acid solution=1g / 150ml, the reaction time is 36h, obtain ion exchange solution I;
[0056] 3) Put the ion exchange solution I into a high-speed centrifuge for washing and separation, collect the solids, and obtain the material II;
[0057] 4) Add the material II to a 2mol / l lithium hydroxide solution, mix it evenly, add it to a hydrothermal reactor, and keep it at 180°C for 18 hours to obtain the ion replacement solution II;
[0058] 5) Wash and separate the ion exchange solution II in a high-speed centrifuge, collect the solids, and obtain the material III;
[0059] 6) Roasting the material III once at 800° C. for 12 hours to obtain ...
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