Preparation method and applications of battery graphene-base current collector
A graphene-based, current collector technology, applied in the field of electrochemical cells, can solve the problems of separation of electrode active materials and current collectors, affecting the energy density of pole pieces, high density of metal current collectors, etc. The effect of great application value and simple preparation process
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Embodiment 1
[0039] Add 200mg of graphene into 400mL ethanol and disperse uniformly by ultrasonic for 0.5h (the content of graphene in the dispersion is 0.5mg / mL) and filter it onto the continuously rolling polyvinylidene fluoride membrane to form long strips of graphene. After rolling, it was separated from the polyvinylidene fluoride film, and dried in vacuum at 70° C. for 12 hours to obtain the graphene current collector. The scanning electron microscope picture of the obtained graphene current collector is shown in Figure 4 (a-b), it can be seen that the graphene sheets are tightly stacked, and the lateral size of the graphene-based current collector is 15-25 microns. Carry out stress-strain performance test to it, described graphene-based current collector can bear the pulling force of 1.8MPa at most, and cellulose paper can bear the pulling force of 0.75MPa at most, as Figure 5 , showing its high mechanical strength properties.
[0040] On the graphene-based current collector, th...
Embodiment 2
[0044] The difference from Example 1 is that the lithium iron phosphate in Example 1 is replaced with lithium titanate negative electrode material, and it is mixed with conductive carbon black and binder (sodium carboxymethyl cellulose) at a ratio of 8:1:1 After the weight ratio is mixed and uniformly dispersed in NMP to form a slurry, it is sprayed on a graphene current collector with a thickness of 25 μm by spraying, and dried in an oven at 120 ° C for 12 hours to obtain a graphene-based current collector / titanium Anode materials for lithium-ion batteries, and their electrochemical performances were characterized. The electrode structure at 35mA·g -1 Under the current density, the initial discharge capacity is 167mAh·g -1 , the capacity increased to 175mAh·g after the second time -1 above. The discharge capacities at various current densities are shown in Figure 8 , at 1750mA·g -1 The discharge capacity is 85mAh·g at the current density -1 , at 3500mA·g -1 The discha...
Embodiment 3
[0048] The difference from Example 1 is that the lithium iron phosphate in Example 1 is replaced by lithium manganate, and after being uniformly dispersed in DMF, an electrode sheet is formed on a graphene current collector with a thickness of 20 μm by scraping , used to test the battery performance of the lithium manganate cathode material, the battery performance similar to that of Example 1 can be obtained, and it is obviously better than the battery performance of Comparative Example 1.
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