A ring-shaped nano-germanium dioxide/polyionic liquid composite material and its preparation method and application
A technology of polyionic liquid and germanium dioxide, which is applied in the direction of secondary batteries, electrochemical generators, structural parts, etc., can solve problems such as unsatisfactory cycle performance, capacity fading, and drastic volume changes of germanium-based materials, and achieve excellent dissolution performance, high charge and discharge capacity, and good cycle performance
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Embodiment 1
[0028] The preparation method of the annular nano-germanium dioxide / polyionic liquid composite material of the present embodiment, the steps are as follows:
[0029] (1) First, 1.5 g of bisvinylimidazolium bromide ionic liquid and 1.5 g of germanium tetrachloride were dissolved in 15 mL of absolute ethanol solution, and the above solution was fully stirred for 2 h;
[0030] (2) Add 375 mg of azobisisobutyronitrile to the above-mentioned mixed solution, heat and stir in an oil bath at 75 °C for 10 hours, and obtain a white blocky solid material through polymerization;
[0031] (3) Dry the obtained massive solid material in a vacuum oven at 60 °C for 8 h, and grind it evenly with an agate mortar to obtain a white powder material.
[0032] from figure 1 From the scanning electron microscope image of the composite material, it can be seen that the nano-germanium dioxide in the prepared composite material is uniformly dispersed in the polyionic liquid in the form of a ring. The s...
Embodiment 2
[0035] The preparation method of the annular nano-germanium dioxide / polyionic liquid composite material of the present embodiment, the steps are as follows:
[0036] (1) First, dissolve 1.5 g of bisvinylimidazolium bromide ionic liquid and 1.5 g of germanium tetrachloride in 20 mL of absolute ethanol solution, and stir the above solution for 2 h;
[0037] (2) Add 1.5 g of divinylbenzene to the mixture prepared above, and stir for 2.5 h;
[0038] (3) Add 500 mg of azobisisobutyronitrile to the above-mentioned mixed solution, heat and stir in an oil bath at 70 °C for 10 h, and polymerize to obtain a yellow blocky solid material;
[0039] (4) Dry the obtained massive solid material in a vacuum oven at 60 °C for 8 h, and grind it evenly with an agate mortar to obtain a yellow powder material.
[0040] As can be seen from the scanning electron microscope images of the composite material in this example, the nano-germanium dioxide in the prepared composite material is uniformly dis...
Embodiment 3
[0043] The preparation method of the annular nano-germanium dioxide / polyionic liquid composite material of the present embodiment, the steps are as follows:
[0044] (1) First, 1.5 g of 1-vinyl-3-butylimidazolium bromide ionic liquid and 1.5 g of germanium tetrachloride were dissolved in 20 mL of absolute ethanol solution, and the above solution was fully stirred for 2 h;
[0045] (2) Add 1.5 g of divinylbenzene to the mixture prepared above, and stir for 2.5 h;
[0046] (3) Add 500 mg of azobisisobutyronitrile to the mixture prepared above, heat and stir in an oil bath at 70 °C for 15 hours, and polymerize to obtain a yellow blocky solid material;
[0047] (4) Dry the obtained massive solid material in a vacuum oven at 60 °C for 8 h, and grind it evenly with an agate mortar to obtain a yellow powder material.
[0048] As can be seen from the scanning electron microscope images of the composite material in this example, the nano-germanium dioxide in the prepared composite mat...
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