Perfect graphene has very good properties, so graphene is considered to have very good applications in many fields, but for good applications it is of paramount importance to obtain high quality graphene at low cost. There are five main methods for the preparation of graphene. The methods of chemical stripping and chemical vapor deposition can control the total amount, and the cost can be saved relatively.
Due to its two-dimensional structure and ultra-thin graphene, graphene is also characterized by high conductivity, high mechanical properties, large specific surface area, easy functionalization and good stability. Therefore, graphene can be used in batteries and other devices. Its applications include active materials, conductive networks, catalysts, interfacial materials, matrix materials, etc. The applied devices are not limited to metal batteries such as lithium-ion batteries, but also include more than capacitors and even flexible energy storage devices.
The following are some of the current research progress of graphene, it has not yet reached the application level:
First, the application of lithium-ion batteries and supercapacitors inside. First of all, graphene can be used as a metal current collector coating material can also be used as conductive additives. In addition, graphite can be done as a negative electrode, graphene is not it? Graphene does have a high capacity, but its irreversible capacity is also high, and its application efficiency is very low, making it difficult to use graphene as a negative electrode. However, the high specific surface area of graphene and abundant functional groups may also be another application In the early days, it was thought of compounding or hybridizing graphene with oxides, graphene was used to suppress agglomeration of oxides, volume changes, and re-stacking of graphenes, while graphene was also recombined with high-capacity materials Will form a good flexible conductive network.
Due to the many defects of graphene oxide can easily form uniform oxide particles on it to improve the performance and capacity of its structure is also diverse, the synthesis is also very simple graphene solution, the oxide into it, Oxides are easily synthesized to form composites.
Second, the application of graphene in lithium-sulfur batteries, the current research is very active in the face of the problem of low content and low sulfur load, graphene can play an important role in improving the lithium-sulfur battery applications, such as the limit Or a combination of chemical methods, but also by inheriting the electrode structure of the relevant improvements.
Third, the possible application of graphene in energy storage. Graphene materials can be used in a variety of energy storage devices, can also play different roles, but the current study found that it does not seem to be able to do a charge eight minutes ran Thousands of kilometers of possibilities.
