A kind of preparation method of cobalt iron double metal selenide sodium ion battery negative electrode material
A sodium ion battery and negative electrode material technology, applied in battery electrodes, active material electrodes, negative electrodes, etc., can solve the problems of poor cycle life and stable performance, and achieve the effects of improving cycle performance, inhibiting volume expansion, and increasing specific capacity
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Embodiment 1
[0027] The first step: the preparation of ZIF-67 precursor:
[0028] Dissolve 0.291 g of cobalt nitrate in 20 mL of methanol and then stir it in a magnetic stirrer at a speed of 400 r / min for 5 min until completely dissolved, which is marked as solution A. Dissolve 0.658 g of 2-methylimidazole in 20 mL of methanol, stir in a magnetic stirrer at a speed of 400 r / min for 5 min until completely dissolved, and mark it as solution B. Quickly pour solution B into solution A and stir for 5 minutes, let stand at room temperature for 24 hours, collect samples by centrifugation at 8000 r / min, wash with methanol three times and dry in an oven at 60 °C Dry and set aside. attached by figure 1 It can be seen that the prepared precursor has a hexagonal rhombus shape, uniform size, and a diameter of about 300-400 nm. It can be seen from the picture that the inside is a hexagonal rhombus, and the outside is a layer of small granular iron.
[0029] Step 2: Synthesis of ZIF-67@Fe-LDH structu...
Embodiment 2
[0034] The first step: the preparation of ZIF-67 precursor:
[0035]Dissolve 0.291 g of cobalt nitrate in 20 mL of methanol and stir it in a magnetic stirrer at a speed of 400 r / min for 5 min until it is completely dissolved and marked as solution A. Dissolve 0.658 g of 2-methylimidazole in 20 mL of methanol, stir in a magnetic stirrer at a speed of 400 r / min for 5 min until completely dissolved, and mark it as solution B. Quickly pour solution B into solution A and stir for 5 minutes, let stand at room temperature for 24 hours, collect samples by centrifugation at 8000 r / min, wash with methanol three times and dry in an oven at 60 °C Dry and set aside.
[0036] Step 2: Synthesis of ZIF-67@Fe-LDH structure
[0037] The obtained 0.05 g of ZIF-67 was dissolved in 5 mL of ethanol, marked as solution C, and sonicated for 10 min. 0.05 g of potassium ferricyanide and 0.63 g of PVP with a molecular weight of 10,000 were dissolved in 40 mL of 50% ethanol solution, marked as D solut...
Embodiment 3
[0041] The first step: the preparation of ZIF-67 precursor:
[0042] Dissolve 0.291 g of cobalt nitrate in 20 mL of methanol and stir it in a magnetic stirrer at a speed of 400 r / min for 5 min until it is completely dissolved, which is marked as solution A. Dissolve 0.658 g of 2-methylimidazole in 20 mL of methanol, stir in a magnetic stirrer at a speed of 400 r / min for 5 min until completely dissolved, and mark it as solution B. Quickly pour solution B into solution A and stir for 5 minutes, let stand at room temperature for 24 hours, collect samples by centrifugation at 8000 r / min, wash with methanol three times and dry in an oven at 60 °C Dry and set aside.
[0043] Step 2: Synthesis of ZIF-67@Fe-LDH structure material
[0044] The obtained 0.05 g of ZIF-67 was dissolved in 5 mL of ethanol, marked as solution C, and sonicated for 10 min. 0.05 g of potassium ferricyanide and 0.63 g of PVP with a molecular weight of 10,000 were dissolved in 40 mL of 50% ethanol solution, m...
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