Preparation of lithium titanate material for lithium battery negative electrode by freeze-drying microemulsion method
A lithium titanate, microemulsion technology, applied in the direction of titanate, battery electrode, alkali metal titanate, etc., can solve the problems of loss of nanoparticle characteristics, high surface energy, instability, etc., and achieve excellent high-rate discharge Effects of Features
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Embodiment 1
[0017] Weigh 0.8685g of lithium acetate, add 10ml of distilled water to dissolve; then weigh 0.2375g of chitosan into 43.5ml of glacial acetic acid solution, and ultrasonically dissolve it into a uniform pale yellow liquid; add 0.87 g of chitosan to the chitosan solution g titanium dioxide powder, 0.0438g neodymium nitrate and 0.0152g scandium nitrate, ultrasonically, magnetically stir for 20min; add the dissolved lithium acetate solution to the chitosan solution, stir for 10min; add 0.4ml of epoxy chloride to the above solution Propane, continue magnetic stirring for 15h, transfer the solution to a petri dish, cover it with plastic wrap, freeze at -80°C, put the frozen sample into a freeze dryer, vacuumize, and dry for 24h to obtain a spongy white The sample was calcined at 800 °C for 10 h in a furnace to prepare the final product.
[0018] figure 1 is the XRD pattern of the obtained sample. It can be seen that the position and relative intensity of each diffraction peak in...
Embodiment 2
[0020] Weigh 0.868g of lithium acetate, add 10ml of distilled water to dissolve; then weigh 0.248g of chitosan into 50ml of glacial acetic acid solution, and ultrasonicate until it is completely dissolved into a uniform pale yellow liquid; add 0.68g to the chitosan solution Titanium dioxide powder, 0.0222g of samarium nitrate and 0.0433g of lanthanum nitrate, ultrasonically, magnetically stirred for 40min; add the dissolved lithium acetate solution to the chitosan solution, stir for 20min; add 0.5ml of epoxy chloride to the above solution Propane, continue magnetic stirring for 5h, transfer the solution to a petri dish, cover it with plastic wrap, freeze at -80°C, put the frozen sample into a freeze dryer, vacuumize, and dry for 10h to obtain a spongy white The sample was calcined at 600 °C for 15 h in a furnace to prepare the final product.
Embodiment 3
[0022] Weigh 0.9g of lithium acetate, add 10ml of distilled water to dissolve; then weigh 0.315g of chitosan into 80ml of glacial acetic acid solution, and ultrasonically dissolve it into a uniform pale yellow liquid; add 0.8g to the chitosan solution Titanium dioxide powder, 0.0438g neodymium nitrate and 0.0433g lanthanum nitrate, ultrasonically, magnetically stir for 50min; add the dissolved lithium acetate solution to the chitosan solution, stir for 40min; add 0.6ml of epichlorohydrin to the above solution , continue magnetic stirring for 15h, transfer the solution to a petri dish, cover it with plastic wrap, freeze at -80°C, put the frozen sample into a freeze dryer, vacuumize, and dry for 48h to obtain a sponge-like white sample , the samples were calcined at 900 °C for 8 h in a furnace to obtain the final product.
[0023] figure 2 In order to use the material as the positive electrode and the metal lithium sheet as the negative electrode to assemble a simulated batter...
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