A kind of hollow spherical composite material and its preparation method and application
A composite material and hollow spherical technology, applied in the direction of active material electrodes, alkaline storage batteries, structural parts, etc., can solve the problems of cumbersome preparation process of zinc oxide and uneven modification of metal oxides, so as to achieve full contact and improve electrochemical performance. performance, effect on mitigating dendrite and deformation problems
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Embodiment 1
[0031] 1) Dissolve 0.75g of zinc nitrate hexahydrate, 0.05g of bismuth nitrate pentahydrate, 0.015g of aluminum chloride in 50ml of DMF, and dissolve 0.24g of 1,3,5- trimesic acid, 1g of PVP, and 40μl of TEA in another 50ml DMF.
[0032] 2) The latter solution in step 1 was slowly poured into the former solution and ultrasonicated for 15 min at 30°C; the ultrasonic frequency was 30 kHz, and the obtained mixed solution was transferred to a polytetrafluoroethylene liner equipped with a steel shell, and reacted at 120°C for 8h; After cooling to room temperature, the product was separated by centrifugation. The product was washed three times with absolute ethanol and dried under vacuum at 100°C for 12 hours to obtain a yellow powdery precursor material;
[0033] 3) The obtained precursor is heated at 4°C / min to 650°C for 5 hours in an air atmosphere to obtain a hollow spherical metal oxide composite material of 1-5 μm, whose primary particle size is 20-50 nm.
[0034] 4) Mix the ...
Embodiment 2
[0036] 1) Dissolve 0.75g of zinc nitrate hexahydrate, 0.035g of stannous chloride dihydrate, 0.015g of aluminum chloride in 50ml of DMF, and dissolve 0.24g of trimesic acid, 1g of PVP, and 40μl of TEA in another 50ml of DMF. middle.
[0037] 2) The latter solution in step 1 was slowly poured into the former solution and ultrasonicated for 15min; the ultrasonic frequency was 30KHz, and the obtained mixed solution was transferred to a polytetrafluoroethylene liner equipped with a steel shell, and reacted at 120 ° C for 8h; At room temperature, the product was centrifuged, washed three times with ethanol, and dried under vacuum at 100 °C for 12 h;
[0038] 3) The obtained precursor is heated at 4°C / min to 650°C for 5 hours in an air atmosphere to obtain a hollow spherical metal oxide nanocomposite material of 1-5 μm, whose primary particle size is 20-50 nm.
[0039] 4) Mix the nanocomposite material and electrode additives (conductive carbon, sodium carboxymethyl cellulose, poly...
Embodiment 3
[0041]The other conditions are the same as those in Example 1, except that the added stannous chloride dihydrate in step 1 is changed to 0.02 g of indium chloride.
[0042] The obtained product was subjected to cycle test, after 180 cycles of charge and discharge, the specific capacity was 614.2mAh g-1, and the average Coulomb efficiency was 93.2%.
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