C/C coaxial nano-fiber composite membrane cathode material for lithium battery and preparation method thereof
A composite film and nanofiber technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of fast reversible lithium storage capacity decay, unsatisfactory cycle performance, and high voltage platform, and achieve excellent charge-discharge cycle stability. Excellent charge and discharge performance, simple configuration effect
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Embodiment 1
[0034] The mineral oil of the core layer spinning solution and the prepared shell solution (PAN / DMF=0.6g / 10ml) were prepared according to the figure 1 The coaxial spinning equipment is loaded into the corresponding syringe for electrospinning. The corresponding process parameters are: core layer 0.1ml / h, shell layer 0.3ml / h, core layer is a needle with an inner diameter of 0.2m, and the shell layer is a needle with an inner diameter of 0.5m Needle, voltage 8KV, receiving method is drum receiving, drum receiving, receiving distance is 10cm, receiving time is 4 hours. The obtained electrospun coaxial nanofiber membrane was heated up to 200° C. for 300 minutes at a speed of 5° C. / min and pre-oxidized for 300 minutes. The atmosphere was air, and the oxygen content was 21% (V / V). Finally, the pre-oxidized nanofibrous membrane was placed in a carbonization furnace, carbonized in a nitrogen atmosphere at 500 °C for 48 h, the heating rate was 1 °C / min, and the temperature was cooled t...
Embodiment 2
[0036] Put the mineral oil of the core spinning solution and the prepared shell solution (PAN / DMF=2.0g / 10ml) into the corresponding syringes, and perform electrospinning according to the coaxial spinning equipment shown in Figure 1, and the corresponding process parameters The core layer is 0.6ml / h, the shell layer is 3.0ml / h, the core layer is a needle with an inner diameter of 1.0mm, the shell layer is a needle with an inner diameter of 2.0mm, the voltage is 30KV, the receiving method is drum receiving, the receiving distance is 40cm, and the receiving time is 2 Hour. The obtained electrospun coaxial nanofiber membrane was pre-oxidized at a rate of 3 °C / min to 300 °C for 30 min, the atmosphere was air, and the oxygen content was 21% (V / V). Finally, the pre-oxidized nanofiber membrane was placed in a carbonization furnace, carbonized in a nitrogen atmosphere at 2800 °C for 0.5 h, the heating rate was 20 °C / min, and cooled to room temperature at a cooling rate of 30 °C / min to ...
Embodiment 3
[0038] Put the mineral oil of the core layer spinning liquid and the prepared shell layer solution (PAN / DMF=1.4g / 10ml) into the corresponding syringe for electrospinning according to the coaxial spinning equipment shown in Figure 1, and the corresponding process parameters are : The core layer is 0.1ml / h, the shell layer is 0.4ml / h, the core layer is a needle with an inner diameter of 0.5mm, the shell is a needle with an inner diameter of 1.5mm, the voltage is 18KV, the receiving method is a drum receiving, the receiving distance is 20cm, and the receiving time is 4 hours . The obtained electrospun coaxial nanofiber membrane was pre-oxidized at a rate of 2°C / min to 270°C for 4 hours, the atmosphere was air, and the oxygen content was 21% (V / V). Finally, the pre-oxidized nanofibrous membrane was placed in a carbonization furnace, and carbonized for 1 h at 850 °C in an atmosphere of nitrogen and argon (volume ratio 1:1), with a heating rate of 1 °C / min and a temperature of 5 °C / ...
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