COMBINING METHOD AND ITS COMBINING MATERIAL OF POSITIVE ELECTRODE ACTIVE MATERIAL FOR NONAQUEOUS LITHIUM SECONDARY BATTERY AND CONDUCTIVE SUBSIDIARY MATERIAL, AND POSITIVE ELECTRODE AND NONAQUEOUS LITHIUM SECONDARY BATTERY USING THE SAME

摘要

PPROBLEM TO BE SOLVED: To improve dispersibility of a positive electrode material and a conductive subsidiary material (carbon powder) and make an initial capacity of a positive electrode of a nonaqueous lithium secondary battery and discharging rate characteristics better than a conventional one. PSOLUTION: A positive electrode active material, a conductive subsidiary material (carbon powder), a solvent and a binder are mixed to make up a slurry, which is spray dried to obtain a complex material of the positive electrode active material and the conductive subsidiary material. The spray drying is made at 100 to 350C by a spray dryer, which makes up a complex material with the positive electrode active material held around the carbon powder. Then, after a solvent with a binder dissolved in it is added to and kneaded with the complex material, it is coated on and pressed to a metal foil and dried to make up a positive electrode. PCOPYRIGHT: (C)2003,JPO