New energy vehicles or will fully replace traditional fuel vehicles?

At present, in the world, new energy vehicles have become the trend of the times, policies strongly supported by all countries, and even many countries have made a timetable for the withdrawal of traditional fuel vehicles. It can be said that in the future, new energy vehicles Or it will replace traditional fuel vehicles. Among new energy vehicles, countries in particular regard the development of pure electric vehicles as an important direction. In electric vehicles, the three-electric system is the core, and the battery is the core of the core. As the power source of power energy and the vehicle, it plays a very important purpose. At present, the mainstream battery for electric vehicles is lithium battery, with moderate energy density, relatively mature, and relatively advantageous manufacturing cost. However, lithium batteries also have very fatal weaknesses, such as poor safety and easy to cause fire; for example, charging is very slow, and it takes several hours at the earliest. In addition, lithium batteries have high internal impedance. Because the electrolyte of lithium batteries is an organic solvent, its conductivity is much lower than that of nickel-cadmium batteries and nickel-hydrogen batteries with aqueous electrolytes. The internal impedance of lithium batteries is about 11 times that of nickel-cadmium batteries and nickel-hydrogen batteries. For example, the impedance of a single battery with a length of 18 mm and a diameter of 50 mm is about 90. In addition, the operating voltage of lithium batteries varies greatly. For example, when the battery is discharged to 80% of the rated capacity, the voltage change of a nickel-cadmium battery is small (about 20%), while the voltage change of a lithium battery is relatively large (about 40%). This is a serious shortcoming of battery-powered equipment, but because lithium batteries have a wide range of discharge voltage, it is easy to detect the remaining power of the battery. The graphene battery is a new energy battery developed by using lithium ions that shuttle quickly and in large quantities between the graphene surface and the electrode. Graphene is no longer a new concept. Many experts and scholars at home and abroad have conducted research on this for many years. Although there are some exciting experimental phenomena and results, this is only at the stage of theoretical exploration in the laboratory. Therefore, graphene batteries cannot be processed on a large scale, so they cannot replace lithium batteries at present. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous post: The difference between lead-acid batteries and lithium batteries from six aspects