Why are lithium batteries in electric vehicles not replaced by graphene batteries?

Why haven't the lithium-ion batteries of electric vehicles been replaced by graphene batteries?

Now, in the world, new energy vehicles have become the general trend, and the policies of all countries in the world have been strongly supported. In addition, many countries have even instituted delisting timetables for conventional fuel vehicles. It can be said that in the future, new energy vehicles will completely replace traditional fuel vehicles. When approaching new energy vehicles, countries especially focus on the development of pure electric vehicles.

Next to electric vehicles, the three-electric system is the center, and the battery in it is the center. The battery plays a very important role as the power source of the vehicle and the power source of the whole vehicle. Now, the mainstream battery for electric vehicles is the lithium-ion battery. This kind of battery has moderate energy density, relatively long service life, and has advantages in manufacturing cost. However, lithium-ion batteries also have very fatal defects, such as poor safety, ease to catch fire; such as slow charging, the fastest is a few hours. In addition, lithium-ion batteries have high internal impedance. Since the electrolyte of lithium-ion battery is an organic solvent, its conductivity is much lower than that of nickel-cadmium battery and nickel-hydrogen battery, so the internal resistance of a lithium-ion battery is about 11 times larger than that of nickel-cadmium battery and nickel-hydrogen battery. For example, a single cell with a diameter of 18mm and a length of 50mm has an impedance of about 90m.

In addition, the operating voltage of lithium-ion batteries has also changed a lot. For example, when the battery is discharged to 80% of the additional capacity, the voltage change of the nickel-cadmium battery is small (about 20%), and the voltage change of the lithium-ion battery is larger (about 40%). This is a serious drawback for battery-operated devices, but since the discharge voltage of Li-ion batteries varies widely, it is also very simple to detect how much power is left in the battery.

Graphene battery is a new type of energy battery based on the rapid and multiple shuttle motion of lithium ions between graphene surface and electrodes. Graphene is not a new concept right now. Over the years, many experts and scholars at home and abroad have been engaged in this work. Although there are some exciting experimental phenomena and effects, they are only in the theoretical research stage in the laboratory. There are many problems with manufacturing, processing, and usage efficiency. Therefore, graphene batteries do not meet the conditions for mass production and therefore cannot replace lithium-ion batteries for the time being.