Lithium iron phosphate security

The cathode, the lithium iron phosphate (LiFePO4) charge state of high thermal stability, oxidation of the electrolyte is low, with better security, more battery can be used to do. LiFePO4 theoretical capacity of 170 mAh / g, compared to lithium voltage of 3.5V, made of materials can exceed the actual reversible capacity 160 mAh / g. Compared with other materials, lithium ion chemical diffusion coefficient in LiFePO4 low electronic conductivity at room temperature far lower than other cathode materials, need to reduce the material size, method of coating conductive agents to improve performance and achieve application materials bring the defect is low density, cell size is too large and more than the amount of electrolyte. The current research focus is to develop new lithium iron phosphate synthesis and modification of materials to improve the overall performance of lithium iron phosphate.

The first synthesis of lithium iron phosphate way JB Goodenough Solid State Reaction. The method is simple, easy to operate, the cycle of disadvantage is the synthesis of longer, more difficult to control the stability of the product batch. How the process of heat treatment and powder processing to prevent oxidation of divalent iron synthetic critical control points. There are a lot of R & D team developed the carbon thermal reduction method, coprecipitation, hydrothermal, spray pyrolysis method.

The international production of lithium iron phosphate can the enterprises Valence, A123, Phostech so. Lithium iron phosphate with an ongoing industrial development of many enterprises. According to the Internet survey, 80% of domestic well-known cathode materials for lithium battery suppliers of external claims that its lithium iron phosphate-related products during development and production. And "international professional players," contrast, from the research and development efforts and time put into perspective, still in its infancy.

Compared to other lithium battery material, lithium iron phosphate is still very young. Some people say that the battery used in electric tools, it is said to be used with the battery electric bus, the initial development is to be encouraged.

Japan in the field of lithium-ion battery monopoly, Sony, Sanyo Electric, Asus Laptop Battery such as Asus A42-A3 Battery, Acer TravelMate 2300 Battery, Acer Aspire 1680 Battery, Acer Aspire 1410 Battery, Acer TravelMate 4500 Battery, Acer LCBTP03003 Battery, Acer Aspire 1300 Battery, Acer BTP-APJ1 Battery, Acer BTP-AQJ1 Battery, Acer BTP-ARJ1 Battery, Acer BATCL32 battery and Acer BATCL32L battery, NEC and other famous companies have built large-scale lithium-ion battery production line, and most manufacturers in addition to maintaining and expanding existing production of foreign brands, are use their own advantages to develop lithium-ion battery of new products. Japan's New Sunshine program started in 1992 that lithium ion battery car development program, R & D funds more than one billion U.S. dollars, access to technology and technological breakthroughs. Toyota has started mass production of automotive lithium-ion rechargeable battery, for listing in February 2003 a small car "Vitz" part of the model, stability has withstood the test of the market. Hitachi, NEC, Mitsubishi and other companies mass produce lithium-ion batteries used in electric vehicles and hybrid electric vehicles, Fuji Heavy Industries introduced the design for the Tokyo Electric Power lithium manganese oxide used as cathode material for lithium-ion dell studio xps 13 battery electric vehicle "R1e", fast charge mode, 15 minutes full of 80%, 1 charge, can run about 80km. Maximum speed of 100km / h. Tokyo Electric Power in the year 2006 and then into 30 R1e. In addition, since 2007 a total import of about 3000. Overall, Japan remains the country's leading battery technology, its power and its key materials, battery production technology has matured, performance has almost met the demand electric vehicles.