a doughnut-like fe 2 o 3 Preparation method of negative electrode material for /c lithium ion battery
A lithium-ion battery and negative electrode material technology, applied in battery electrodes, negative electrodes, secondary batteries, etc., can solve the problems of large volume change, poor rate performance, low conductivity, etc., and achieve large specific surface area and improved electrochemical performance , the effect of high conductivity
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Embodiment 1
[0029] S1. Weigh 1.1 mmol of fumaric acid of analytical purity and dissolve it in 20 mL of deionized water, and stir at 60° C. at 400 rpm for 10 min. Then, 1.3 mmol of ferric nitrate nonahydrate was added to the solution, and stirred for another 10 min to obtain an orange-red liquid.
[0030] S2. Transfer the solution obtained above to a polytetrafluoroethylene stainless steel autoclave (total capacity of 40 mL), and keep it at 140°C for 6h, the heating rate is controlled at 5°C / min, and then the reaction kettle is naturally cooled to room temperature, remove the mixture.
[0031] S3. Centrifuge and wash the above mixture with ethanol and distilled water for 3 to 5 times, and place the obtained powder in a vacuum drying oven at 70°C for 6 hours to obtain a donut-shaped Fe with a high specific capacity. 2 o 3 / C material.
Embodiment 2
[0033] S1. Weigh 1.2 mmol of fumaric acid of analytical purity and dissolve it in 25 mL of deionized water, and stir at 70° C. at 400 rpm for 10 min. Then, 1.3 mmol of ferric nitrate nonahydrate was added to the solution, and stirred for another 10 min to obtain an orange-red liquid.
[0034] S2. The solution obtained above was transferred to a polytetrafluoroethylene stainless steel autoclave (40 mL in total capacity), and kept at 150° C. for 6 h. The heating rate was controlled at 5 °C / min, and then the reaction kettle was naturally cooled to room temperature, and the mixture was taken out.
[0035] S3. Wash the above mixture by centrifugation with ethanol and distilled water for 3 to 5 times, and place the obtained powder in a vacuum drying oven at 70°C for 12 hours to obtain a donut-shaped Fe with a high specific capacity. 2 o 3 / C material.
[0036] Such as figure 1 Shown, the donut-shaped Fe prepared in embodiment 2 2 o 3 The transmission electron microscope pictur...
Embodiment 3
[0043] S1. Weigh 1.3 mmol of fumaric acid of analytical purity and dissolve it in 25 mL of deionized water, and stir at 70° C. at 400 rpm for 20 min. Then, 1.3 mmol of ferric nitrate nonahydrate was added to the solution, and stirred for another 20 min to obtain an orange-red liquid.
[0044] S2. The solution obtained above was transferred to a polytetrafluoroethylene stainless steel autoclave (40 mL in total capacity), and kept at 160° C. for 7 h. The heating rate was controlled at 5 °C / min, and then the reaction kettle was naturally cooled to room temperature, and the mixture was taken out.
[0045] S3. Centrifuge the above mixture with ethanol and distilled water for 3 to 5 times, and place the obtained powder in a vacuum drying oven at 80°C for 8 hours to obtain a donut-shaped Fe with a high specific capacity. 2 o 3 / C material.
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