A kind of silicon-based composite negative electrode material and its preparation method and lithium ion battery
A negative electrode material and silicon-based technology, which is applied in the field of lithium-ion batteries, silicon-based composite negative electrode materials and their preparation, can solve the problems of poor dispersion of nano-silicon and graphite materials, difficulty in uniform intercalation of alkali metals, and low capacity retention. , to achieve the effects of easy mass production, improved ion and electronic conductivity, and low volume expansion
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Embodiment 1
[0085] This example is prepared according to the following method:
[0086] (1) Nitribrate of 4: 1 of 4: 1 is dissolved in DMF, and the solution is transferred to a reactor with a polytetrafluoroethylene in an oven with a polytetrafluoroethylene liner after complete dissolution. After 10 h, after the reaction was completed, the reactor was naturally cooled at room temperature. Filtration, the white crystals were washed with DMF, natural air dried to obtain the first precursor;
[0087] (2) The resulting first precursor is placed in the tube furnace, and nitrogen gas is introduced to a temperature rise rate of 3 ° C / min to 600.0 ° C, heat insulation 2.0 h, and then the temperature rise at 3 ° C / min High to 750 ° C, the CO gas is introduced, the gas flow is 3.5 L / min, the temperature is maintained for 3 hours, resulting in the second precursor;
[0088] (3) Access n in tubular furnace contained in the second precursor 2 Purified 20 minutes, adjust the temperature to 850 ° C, a...
Embodiment 2
[0096] This example is prepared according to the following method:
[0097] (1) Nitrate ratio of 1: 2 is 1: 2, and 2-methylimidazole is dissolved in methanol, and the zinc-based MOF material is obtained after ultrasonic stirring for 3 h. The first precursor was obtained by centrifugation, dry, and naturally air dried.
[0098] (2) The resulting first precursor is placed in the tube furnace, and nitrogen gas is introduced to a temperature rise rate of 3 ° C / min to 600.0 ° C, heat insulation 2.0 h, and then the temperature rise at 3 ° C / min High to 750 ° C, the CO gas is introduced, the gas flow is 3.5 L / min, the temperature is maintained for 3 hours, resulting in the second precursor;
[0099] (3) Access n in tubular furnace contained in the second precursor 2 Purified 20 minutes, adjust the temperature to 850 ° C, access SICL 4 Gas, gas flow rate 2.0 l / min, switch the gas to N after the holding is 3 hours 2 , The reaction is stopped. After the temperature is lowered to roo...
Embodiment 3
[0104] This example is prepared according to the following method:
[0105] (1) The mass ratio of 2: 1 is dissolved in DMF in DMF, and the solution is transferred to a reaction kettle with a polytetrafluoride in an oven with a polytetrafluoroethylene liner after completion. At 10 h, after the reaction, the reactor was naturally cooled at room temperature. Filtration, the white crystals were washed with DMF, natural air dried to obtain the first precursor;
[0106] (2) The resulting first precursor is placed in the tube furnace, and nitrogen gas is introduced to a temperature rise rate of 3 ° C / min to 600.0 ° C, heat insulation 2.0 h, and then the temperature rise at 3 ° C / min High to 750 ° C, the CO gas is introduced, the gas flow is 3.5 L / min, the temperature is maintained for 3 hours, resulting in the second precursor;
[0107] (3) Access n in tubular furnace contained in the second precursor 2 Purified 20 minutes, adjust the temperature to 850 ° C, access SICL 4 Gas, gas ...
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