The paper introduced the development of secondary lithium battery status quo and the existing problems

Source: 2020 - 04 - 14 but hits: time introduces the lithium secondary battery development present situation and existing problems of the lithium battery has the high working voltage, than can be high, wide working temperature range, stable discharge, etc. Lithium battery research began in the late 1950 s, its development has experienced a lithium batteries, lithium secondary batteries, lithium ion secondary battery three stages. A lithium battery usually directly using lithium metal as the cathode. According to the type of electrolyte and cathode materials used, can be divided into soluble cathode cell ( Such as Li/SO2, Li/SCC12 and Li/S02C12) And solid cathode cell ( Such as Li/Mn02, Li/( CF) ) 。 Lif CuO, solid electrolyte battery ( Such as Li/LiI/I2 ( P2VP) ) And molten salt electrolyte battery ( LiA1/ lic1- kc1 /FeS2) 。 Since the beginning of the 20th century, a portable electronic device is designed to be more and more small, the lighter, smaller and more durable rechargeable battery demand is becoming more and more big. Although tin nickel battery has done a lot of work to meet this requirement, but their energy performance has reached the limit, the impact on the environment is significant. Therefore, it is necessary to develop a new type of electrochemical batteries. Since the 1980 s, with lithium metal anode, without hydrolysis solution of primary battery has been successfully entered the market. Compared to ordinary dry battery electrolyte, has the following marked characteristics: 1) High voltage; 2) Can ratio ( Can include volume and weight ratio can) ; 3) Low self-discharge rate; 4) Wide temperature range. Therefore, as the candidate of ratio to battery, lithium battery has been more and more attention. Represented by Li/Mn02 all kinds of lithium battery has been widely into the market at a time, show a lithium battery is a lithium salt, organic solvents. In the mid - 1980 - s, the rapid development of the system become diversified, with Li/MoS2, Li/Mn and LiV205 as the main system. However, metallic lithium and the electrolyte in the chemical reaction in the process of charging and discharging, the utilization of metal lithium is greatly reduced to 25%. In order to develop the secondary lithium battery, people do a lot of work. Secondary lithium batteries, however, there are many practical problems in the process of development, including: 1) Loop performance is poor; 2) Charging time long; 3) Safety performance is low. Almost all of these problems are caused by in the process of charging lithium dendrite. In order to solve the disadvantage of lithium metal anode, people developed many storing lithium materials as anode materials, including aluminum, wood, metal and graphite ion secondary battery is developed rapidly in recent years a new type of battery. In 1985, SONY began to develop in lithium metal anode, carbon as anode of lithium battery. The successful development is a new type of secondary battery anode with carbon, and for the first time in 1990 to the market. About ion secondary battery materials, features, process technology and battery performance research, please pay attention to the back.