Study On The Preparation And Modification Of LiFePO₄ As Cathode Materials For Lithium Ion Battery

There are increasing interesting in lithium ion batteries, in accordance with the development of portable electronic equipment, and as a power supply for future vehicles and load leveling systems. Among the known, Li insertion compounds, layered rock salt systems LiCoO₂, LiNiCO₂, and spinel framework system LiMn₂O₄, are now used as cathode materials. However, the stability of the materials at the fully charged state is a problem, and the cost and the environmentally acceptance for cobalt and nickel compounds are unfavorable. For LiMn₂O₄, rapid capacity fade under high temperature has been pointed out as severe drawbacks.Recently LiFePO₄ was studied intensively as a potential cathode materials for lithium ion batteries, because of its low cost and improved safety. Because LiFePO₄ material has a low electronic conductivity, the reversible capacity was low.In order to improve its reversible capacity, some research works have been...