Preparation method of lithium ion battery silicon-niobium porous composite negative electrode material
A lithium-ion battery and negative electrode material technology, applied in the direction of electrode manufacturing, battery electrodes, negative electrodes, etc., can solve the problems of material pulverized surface, difficult commercial application, side reactions, etc., to improve electrochemical performance, simplify production process, Improve the effect of transmission path
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Embodiment 1
[0018] Example 1: According to the stoichiometric ratio (Nb:Se=1:2), the niobium powder is weighed, and the selenium powder is 6% in excess of the stoichiometric ratio, and then added to generate NbSe 2 6% by mass of tetraethyl orthosilicate. Then add a certain amount of acetone, the solid-to-liquid ratio is 0.2:1, ultrasonically disperse for 20 minutes, and then wet mill at a speed of 300r / min in a ball mill for 6 hours; Calcined in the vessel at 900°C for 4h at a heating rate of 5°C / min in an argon atmosphere to obtain the precursor micron flake NbSe 2 / Si composite material. The final NbSe that will be produced 2 The / Si composite material was fully ground in an agate mortar for 10 min, then placed in a corundum burning boat, and heated to 700 °C at a heating rate of 10 °C / min in a tube furnace in an air atmosphere. After holding for 3 h, microporous flake Nb was obtained. 2 o 5 / SiO x Composite anode materials.
Embodiment 2
[0019] Embodiment 2: Take niobium powder according to stoichiometric ratio (Nb:Se=1:2), selenium powder is excessive 4% than stoichiometric ratio, add the NbSe that is generated subsequently 2 12% nano silicon by mass. Then add a certain amount of anhydrous ethanol, the solid-to-liquid ratio is 0.5:1, ultrasonically disperse for 30 minutes, and wet-mill at a speed of 400r / min for 9 hours in a ball mill; after the ball mill is completed, dry it in a blast drying oven at 100°C, and then transfer Calcinate in a closed container at 700°C for 2 hours at a heating rate of 10°C / min under an argon atmosphere to obtain the precursor micron flake NbSe 2 / Si composite material. The final NbSe that will be produced 2 The / Si composite material was fully ground in an agate mortar for 20 minutes, then placed in a corundum burning boat, and placed in a tube furnace in an air atmosphere at a heating rate of 5°C / min to 600°C. After holding for 2 hours, microporous flake Nb was obtained. 2 o...
Embodiment 3
[0020] Embodiment 3: Take niobium powder according to stoichiometric ratio (Nb:Se=1:2), selenium powder is excessive 2% than stoichiometric ratio, then add to generate NbSe 2 15% by mass of tetraethyl orthosilicate. Then add a certain amount of deionized water, the solid-to-liquid ratio is 0.4:1, ultrasonically disperse for 15 minutes, and wet-mill in a ball mill at a speed of 200r / min for 5 hours; after the ball mill is completed, place it in a blast drying oven at 80°C to dry, and then transfer Calcinate in a closed container at 900°C for 3h at a heating rate of 15°C / min under an argon atmosphere to obtain the precursor micron flake NbSe 2 / Si composite material. The final NbSe that will be produced 2 The / Si composite material was fully ground in a mortar for 15 min, then placed in a corundum burning boat, and heated to 800 °C in a tube furnace at a heating rate of 15 °C / min in an air atmosphere. After holding for 4 h, microporous flake Nb was obtained 2 o 5 / SiO x Com...
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