Preparation and Electrochemical Properties of Cathode and Anode Materials for Lithium Ion Battery by Aerosol Process

Lithium Ion Batteries -New Developments 24 Spray pyrolysis processSpray pyrolysis is a versatile process regarding the powder synthesis of inorganic and metal materials (Messing, et.al, 1993, Dubois, et.al, 1989, Pluym, et.al, 1993).An atomizer such as ultrasonic (Ishizawa, et.al, 1985) or two-fluid nozzle (Roy, et.al, 1977) is often used to generate the mist.The mist is droplet in which the inorganic salts or metal organic compound is dissolved in water or organic solvent.The droplets were dried and pyrolyzed to form oxide or metal powders at elevated temperature.The advantages of spray pyrolysis are that the control of particle size, particle size distribution and morphology are possible.Furthermore, the fine powders with homogeneous composition can be easily obtained because the component of starting solution is kept in the mist derived from an ultrasonic atomizer or two-fluid nozzle.Each metal ion was homogeneously blending in each mist.Each mist play a role as the chemical reactor at the microscale.The production time was very short (less than 1 min).In the other solution process such sol-gel, hydrothermal, precipitation, hydrolysis, the oxide powders were often prepared for few hours.In addition, the process such as the separation, the drying and the firing step must be done after the chemical reaction in the solution.The oxide powders are continuously obtained without these steps in the spray pyrolysis.So far, it has been reported that this process is effective in the multicomponent oxide powders such as BaTiO 3 (Ogihara, et.al, 1999) and alloy powders such as Ag-Pd (Iida, et.al, 2001).Recently, layered type of lithium transition metal oxides such as LiCoO 2 (Ogihara, et.al 1993), LiNiO 2 (Ogihara, et.al, 1998), LiNi 0.5 Mn 1.5 O 4 (Park, et.al, 2004),LiNi 1/3 Mn 1/3 Co 1/3 O 2 (Park, et.al, 2004) and spinel type of lithium transition metal oxides such as LiMn 2 O 4 (Aikiyo, et.al, 2001), which are used as the cathode materials for Li ion batteries also have been synthesized by spray pyrolysis.It has been clear that these cathode materials derived from spray pyrolysis showed excellent rechargeable performances.This revealed that the particle characteristics such as uniform particle morphology, narrow size distribution and homogeneous chemical composition led to higher rechargeable capacity, higher efficiency, long life cycle and higher thermal stability. How to referenceIn order to correctly reference this scholarly work, feel free to