A kind of multi-dimensional composite high-performance lithium ion battery negative electrode material and preparation method thereof
A technology for lithium ion batteries and negative electrode materials, applied in battery electrodes, secondary batteries, nanotechnology for materials and surface science, etc., can solve problems such as limiting electrode specific capacity, achieve buffer volume expansion effect, large specific surface area, etc. , the effect of good material performance
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Embodiment 1
[0023] (1) Add 0.75mmol ferric nitrate hexahydrate and 2.00mmol cobalt nitrate tetrahydrate into a beaker filled with 30mL deionized water in turn, stir magnetically until completely dissolved, and record it as solution A; at the same time, add 5mmol urea and 2mmol ammonium fluoride Add it into a beaker filled with 30mL deionized water, stir magnetically until it is completely dissolved, and record it as solution B; mix solution A and solution B, and stir magnetically for 20 minutes;
[0024] (2) Drop the above solution into a beaker containing 10 mL of graphene oxide, the concentration of graphene oxide is 3.5 mg / mL, stir and mix for 30 minutes, and ultrasonicate for 30 minutes;
[0025] (3) Transfer the mixed solution obtained in the above steps to a 100mL hydrothermal reaction kettle, and conduct a hydrothermal reaction in a drying oven at 140°C for 10 hours; After centrifuging three times, the resulting black sample was placed in a freeze drying oven to dry for 24 hours; ...
Embodiment 2
[0028] (1) Add 1.00 mmol of ferric nitrate hexahydrate and 2.00 mmol of cobalt nitrate tetrahydrate into a beaker filled with 30 mL of deionized water in turn, stir magnetically until completely dissolved, and record it as solution A; at the same time, add 5 mmol of urea and 2 mmol of ammonium fluoride Add it into a beaker filled with 30mL deionized water, stir magnetically until it is completely dissolved, and record it as solution B; mix solution A and solution B, and stir magnetically for 30 minutes;
[0029] (2) Drop the above solution into a beaker containing 10 mL of graphene oxide, the concentration of graphene oxide is 3.5 mg / mL, stir and mix for 35 minutes, and ultrasonicate for 60 minutes;
[0030] (3) Transfer the mixed solution obtained in the above steps to a 100mL hydrothermal reaction kettle, and conduct a hydrothermal reaction in a drying oven at 160°C for 12 hours; After centrifuging three times, the resulting black sample was placed in a freeze drying oven to...
Embodiment 3
[0033] (1) Add 1.25 mmol of ferric nitrate hexahydrate and 2.00 mmol of cobalt nitrate tetrahydrate into a beaker filled with 30 mL of deionized water in turn, stir magnetically until completely dissolved, and record it as solution A; at the same time, add 5 mmol of urea and 2 mmol of ammonium fluoride Add it into a beaker filled with 30mL deionized water, stir magnetically until it is completely dissolved, and record it as solution B; mix solution A and solution B, and stir magnetically for 40 minutes;
[0034] (2) Drop the above solution into a beaker containing 10 mL of graphene oxide, the concentration of graphene oxide is 3.5 mg / mL, stir and mix for 20 minutes, and ultrasonicate for 45 minutes;
[0035](3) Transfer the mixed solution obtained in the above steps to a 100 mL hydrothermal reaction kettle, and conduct a hydrothermal reaction in a drying oven at 200°C for 14 hours; Ethanol was centrifuged three times, and the resulting black sample was placed in a freeze-dryin...
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