What are the advantages of lithium-ion battery packs?

Lithium-ion batteries are the fastest growing battery type in recent years. Lithium-ion batteries are light in weight, high in energy density, and strong in power. They are suitable for providing electrical energy to various devices. Lithium-ion batteries have six significant advantages. Next, the author briefly describes them. The six advantages of lithium-ion battery packs are for your reference; (1) High working voltage. Using carbonaceous lithium intercalation compounds such as graphite or petroleum coke instead of metal lithium as the negative electrode will reduce the battery voltage. However, due to their low lithium insertion potential, the voltage loss can be reduced to a minimum. At the same time, choosing the appropriate lithium intercalation compound as the battery positive electrode and choosing the appropriate electrolyte system (determining the electrochemical window of the lithium ion battery pack) can make the lithium ion battery pack have a higher working voltage (-4V), which is much higher. For aqueous battery system. (2) Large specific capacity Although replacing metal lithium with carbonaceous materials will reduce the specific capacity of the material, in fact, in order to ensure the battery has a certain cycle life in metal lithium secondary batteries, the negative metal lithium is usually more than three times excessive Therefore, the actual decrease in the mass specific capacity of the lithium-ion battery is not large, and the volume specific capacity hardly decreases. (3) The higher energy density and higher working voltage and volumetric specific capacity determine the higher energy density of the secondary lithium ion battery. Compared with the currently widely used Ni-Cd batteries and Ni-MH batteries, secondary lithium-ion batteries have the highest energy density and still have great development potential. (4) Good safety performance and long cycle life. The reason why batteries using lithium metal as anode are unsafe is that multiple charge and discharge changes the structure of the positive electrode of lithium-ion batteries, forming porous dendrites. When the temperature rises, it interacts with the electrolyte. A violent exothermic reaction occurs, and dendrites can pierce the diaphragm, causing an internal short circuit. Li-ion batteries do not have this problem and are very safe. In order to prevent the presence of metallic lithium in the battery, the voltage must be controlled during charging. For safety reasons, lithium-ion batteries are equipped with multiple safety devices. During the charging and discharging process of the lithium ion battery, there is no structural change in the insertion and deintercalation of lithium ions on the cathode and anode (the lattice will expand and contract during the insertion and deintercalation process), and because the lithium intercalation compound is better than the metal lithium It is more stable and does not form lithium dendrites during charging and discharging, thus significantly improving the safety performance of the battery, and at the same time greatly improving the cycle life. Lithium-ion batteries were excluded as dangerous goods by the Dangerous Goods Transportation Division of the U.S. Department of Transportation and IAIT (International Aviation and Transportation Association) in 1989 and 1990, respectively. (5) Low self-discharge rate The lithium-ion battery pack adopts a non-aqueous electrolyte system, and the lithium-intercalated carbon material is thermodynamically unstable in the non-aqueous electrolyte system. During the first charge and discharge process, the reduction of the electrolyte will form a solid electrolyte interphase (SEI) film on the surface of the carbon negative electrode, allowing lithium ions to pass but not allowing electrons to pass, and making the electrode active materials of different charged states. It is in a relatively stable state, so it has a low self-discharge rate. (6) Clean and pollution-free lithium-ion battery packs do not contain toxic substances such as lead, blessing, mercury, etc. At the same time, because the battery must be well sealed, during use Very little gas is released, which does not cause pollution to the environment. The solvent used to dissolve the binder in the manufacturing process can also be completely recycled. Large-scale lithium-ion battery production companies such as Sony have successively started lithium-ion batteries since 1997 Recycling and recycling of materials (such as metal drills, etc.). In addition, in 1996, Sony’s lithium-ion batteries were certified to meet the IS014001 international environmental standard [71O Statement: Some pictures and content of articles published on this site are from the Internet, if any Infringement, please contact to delete the previous article: What are the hazards to the human body caused by incorrectly handled waste batteries;