Syn thesis and characte rization o f LiFePO۴ nanopar ticles via h ydrothermal method

Phosphates LiMPO۴ (M = Mn , Fe, Co, or Ni) have b een investigated intensi vely as prom ising cathod e materials for lithium batteries.[۱]Among several m aterials under develop ment for use as cathodes in lithium-ion batteries, LiFePO۴ appears to be a promising can didate beca use of its hi gh theoreti cal capacity (۱۷۰mAh gí۱), low cost, excellent cycling stability, lo w toxicity, and enviro nmentally benign nature.[۲] LiFePO ۴ has a highly stable three-dime nsional fram ework due to strong P O covale nt bonds in (PO۴)۳í polyanion, which proh ibits the liberation o f oxygen. These charac teristics provide an excellent safety under abus e conditions of the batteries. LiFePO ۴ can be syn thesized using conventional solid-state reactions. However, it is difficult to attain its full capacity, because its electronic conductivity is very lo w, and diff usion of Li+ ion in the olivine struct ure is slow. Several alter native synt hetic method s have been applied to the preparat ion of LiFePO۴. In addition, highly dispersed co nductive substances such as carbo naceous materials and so me metals in the cathode composite electrode w ere reporte d as being ef ficient additives. The h ydrothermal synthesis is a useful method for preparing fi ne particles. It also has other advantages such as a simple process and e nergy efficient.In this study LiFePO۴ was hydrothermall y synthesized at slightly basic and n eutral conditions by add ing a little amount of su crose as a redusing agent.

کلیدواژه ها:

LiFePO۴ ، Hydrothermal method ، Lithiu m ion batteries ، Cathod matherials ، Nano particles