A negative electrode material for double perovskite potassium ion battery synthesized by selective crystallization controlled by electric field and its preparation method
A technology of selective crystallization and double perovskite, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of complex parent action mechanism, large electrochemical polarization, slow potassium ion migration speed, etc. The effect of accelerating migration ability and redox reaction rate, improving potassium ion conductivity, and reducing electron transfer resistance
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Embodiment 1
[0022] Embodiment 1: barium nitrate, potassium nitrate, lanthanum nitrate hexahydrate, zirconium nitrate pentahydrate, scandium oxide, niobium pentoxide according to stoichiometric formula KSc 0.8 La 0.1 Ba 0.1 ZrNbO 6 Put it into a ball mill, the mass ratio of the ball mill and the material is 20:1, and ball mill at a speed of 400 rpm for 20 hours. The ball-milled material is heated up to 900°C at a rate of 10°C / min in a tube furnace, and then a DC voltage of 900V is applied to both ends of the tube furnace. Cool the furnace to 30°C; grind the cooled material in a mortar for 12 minutes, and immerse it in a saturated solution of lithium metaborate at a constant temperature of 30°C under constant stirring at a speed of 1200 rpm with a polytetrafluoroethylene stirring paddle. The mass ratio of the immersed cooled material was 10:1. After stirring for 9 minutes, the constant temperature was lowered to 22° C. and stirred for 15 minutes. Then, it was filtered and dried in a dryi...
Embodiment 2:、、 6 、 5 、、 5 2 KSc0.8La0.1Ba0.1ZrNbO6, and 20∶1,400/15。8℃/ to 900℃ 1 ,900V, and 5 to 30℃;12, 4 1000rpm30℃ and , and and 10∶1,7, to 20℃10,,140℃8。7℃/ to 500℃4 Synthetic 。 Embodiment 3:、、 6 、 5 、、 5 2 KSc0.8La0.1Ba0.1ZrNbO6, and 20∶1,200/10。2℃/ to 800℃ 1 ,600V, and 3 to 30℃;6, 4 900rpm30℃ and , and and 10∶1,5, to 18℃5,,120℃5。3℃/ to 450℃3 Synthetic 。 Embodiment 4:、、 6 、 5 、、 5 2 KSc0.8La0.1Ba0.1ZrNbO6, and 20∶1,300/15。8℃/ to 850℃ 1 ,900V, and 6 to 30℃;15, 4 1000rpm30℃ and , and and 10∶1,7, to 18℃5,,120℃5。8℃/ to 520℃5 Synthetic 。 Embodiment 5
[0023] Embodiment 2: Barium nitrate, potassium nitrate, lanthanum nitrate hexahydrate, zirconium nitrate pentahydrate, scandium oxide, niobium pentoxide according to stoichiometric formula KSc 0.8 La 0.1 Ba 0.1 ZrNbO 6 Put into the ball mill, the mass ratio of the ball mill and the material is 20:1, and ball mill for 15 hours at a speed of 400 rev / min. The ball-milled material is heated to 900°C at a rate of 8°C / min in a tube furnace, and then a DC voltage of 900V is applied to both ends of the tube furnace. Cool the furnace to 30°C; grind the cooled material in a mortar for 12 minutes, and immerse it in a saturated solution of lithium metaborate at a constant temperature of 30°C under constant stirring at a speed of 1000 rpm with a polytetrafluoroethylene stirring paddle. The mass ratio of the immersed cooled material was 10:1. After stirring for 7 minutes, the constant temperature was lowered to 20°C and stirred for 10 minutes, then filtered and dried in a drying oven at ...
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