Preparation of LiNi1-yCoyO2 in certain oxygen pressure
(1. School of Materials and Metallurgy,
Northeastern University, Shenyang 110004，China;
2. School of Petroleum and Chemical Engineering,
Liaoning University of Petroleum and Chemical Technology,
Shenyang 113001. China)
Northeastern University, Shenyang 110004，China;
2. School of Petroleum and Chemical Engineering,
Liaoning University of Petroleum and Chemical Technology,
Shenyang 113001. China)
Abstract: The LiNi1-yCoyO2 as cathode material of lithium ion battery was prepared by solid reaction at high temperature and oxygen pressure. The influences of the prepared conditions on electrochemical properties of products were discussed which include the pressure of oxygen, synthesis time and temperature as well as the molar ratio of the raw materials. The optimal synthetic conditions are as follows: reactive time is 8h and 10h; oxygen pressure is 0.20MPa;reactive temperature is 800℃;and molar ratio of the reactants is Li∶Ni∶Co =1.2∶0.9∶0.1. LiNi0.9Ｃo0.1O2 was synthesized with the perfect crystal structure and the good electrochemical properties. Its discharged capacity is up to 189.4mAh/g. The results of X-ray diffraction and SEM analysis reveal that the product presents a layered structure of LiNiO2. The increase of the oxygen pressure during the reactive processes has important effects on the structure and electrochemical properties of the product.
Key words: lithium ion battery; cathode material LiNi1-yCoyO2; oxygen pressure; optimal synthetic condition