A kind of material for suppressing zinc dendrite and its preparation method and application
A technology of zinc dendrites and composite materials is applied in the field of water-based zinc-based batteries, which can solve the problems of high cost and complicated process, and achieve the effects of low cost, wide source of raw materials and good electrochemical cycle stability.
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Embodiment 1
[0025] Weigh 0.8g activated carbon (powder particle size is 1μm, specific surface area is 1635㎡ / g), 0.2g PVDF and 3gNMP mixture is ground and mixed in an agate mortar for 30 minutes, and then the slurry is coated on the zinc plate surface with a spatula. The zinc plate was vacuum-dried at 120° C., cooled naturally to room temperature, and then cut into the required size to obtain a zinc-carbon composite material as described in Example 1. The slurry is coated on the corresponding carbon layer formed on the surface of the zinc plate, and its surface density is 8mg / cm 2 , with a thickness of 90 μm.
[0026] The prepared composite material was used as the positive and negative electrodes, and the zinc-containing aqueous solution was used as the electrolyte to assemble a symmetrical button battery, and its electrochemical performance was tested. The charge and discharge curves were as follows: figure 1 shown. figure 1 It is shown that the prepared electrode is at 1mAcm -2 The c...
Embodiment 2
[0028] Weigh 0.8g acetylene black (powder particle size is 0.1μm, specific surface area is 874㎡ / g), 0.2g PVDF and 3gNMP mixture is ground and mixed in an agate mortar for 30 minutes, and then the slurry is coated on a zinc plate with a spatula surface. The zinc plate was vacuum-dried at 120° C., and after the reaction, the zinc plate was cut into the required size to obtain a zinc-carbon composite material as described in Example 2. The slurry is coated on the corresponding carbon layer formed on the surface of the zinc plate, and its surface density is 6mg / cm 2 , with a thickness of 120 μm.
Embodiment 3
[0030] Weigh 0.7g Zn powder (i.e. be powdery Zn elemental material, particle diameter is 0.8 μm), 0.2g PTFE (concentration in aqueous solution is 60wt%) and 0.1g acetylene black (powder particle size is 0.1 μm, specific surface area 874㎡ / g), after uniform mixing in isopropanol solvent, roll the mixture into Zn film with double roller machine. After drying the Zn film at 80°C, a composite film of zinc and carbon formed by coating the surface of the Zn powder particles with a single carbon material can be obtained.
[0031] In order to further improve the ability of the composite material of zinc and carbon to suppress zinc dendrites, the obtained composite film of zinc and carbon can also be used as a zinc-based sheet, and the carbon slurry is recoated according to the method in Example 1 on the surface of the Zn film, and vacuum-dried at 120°C. After the reaction, it was cut into the required size to obtain the zinc and carbon composite material described in Example 3. The s...
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