Metal lithium-framework carbon composite material and preparation method thereof, negative electrode and secondary battery
A carbon composite material, secondary battery technology, applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc. The effect of suppressing the formation of dendrites
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[0032] Another aspect of the embodiments of the present application provides a method for preparing carbon nanotube microspheres, comprising: at least uniformly dispersing carbon nanotubes in a solvent to form a surfactant-free dispersion liquid, and then spray-drying, so as to prepare the carbon nanotube microspheres. Carbon nanotube microspheres.
[0033] The carbon nanotube microsphere material can be in the form of powder or particles.
[0034]More specifically, as one of the feasible embodiments of the present invention, the preparation method may include: at least dispersing carbon nanotubes in a solvent to obtain a surfactant-free dispersion, and then inputting the dispersion into the mist of a spray dryer. In the spray dryer, tiny mist droplets are formed, and the mist droplets are brought into co-current contact with the hot air flow in the spray dryer, so that the solvent in the liquid mist droplets is rapidly evaporated, and the The carbon nanotubes in the liquid d...
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[0057] Example 1
[0058] First, weigh 200mg of battery-grade metal lithium and 200mg of commercial porous carbon (average pore size: 2.6nm), put them in a heater inert to metal lithium, heat them to the melting temperature of metal lithium, stir vigorously, and continue for several minutes. Carbon cannot be used as a carrier to absorb molten metal lithium, and the formed complex is in a block shape, indicating that the average pore size is too small to effectively absorb molten metal lithium.
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[0059] Example 2
[0060] First, weigh 200 mg of battery-grade metal lithium and 200 mg of commercial acetylene black (average pore size: 14.4 nm), put them in a heater inert to metal lithium, heat to the melting temperature of metal lithium, stir vigorously, continue for 6-8 minutes, and end the mixing After that, the temperature was lowered to room temperature, and the whole process was carried out in an argon atmosphere.
[0061] Metal lithium-acetylene black microspheres were obtained, wherein the loading amount of metal lithium was: 8.0%.
[0062] Use the material obtained above as the negative electrode of the lithium battery:
[0063] Lithium-ion battery cathode material is LiFePO 4 :PVFD:AB=88:5:7, the thickness is 150um, the electrolyte is 1mol / LLiPF 6 / EC-DMC (1:1vol), assembled into a button cell (CR2025), cycled 25 times, the coulombic efficiency of the battery was not high during the whole cycle, and the coulombic efficiency tended to be stable as the cycle p...
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