A ELECTRODE STRUCTURE WITH MULTI COATING LAYERS HAVING ACTIVE MATERIALS CONSISTING OF DIFFERENT SIZES, AND SECONDARY BATTERY CONTAINING THE SAME.

摘要

Provided is a novel electrode structure in which a second coating layer inside an electrode and a first coating layer outside the electrode are different from each other in negative electrode active material particle size. When the electrode active material particle size of the second coating layer is designed to be smaller than the electrode active material particle size of the first coating layer, the slow electrode reaction speed of the second coating layer can be improved with the smaller active material particle size. Also, the electrolyte wettability of the electrode structure can be significantly improved when the larger pore size of the first coating layer and a binder system having excellent electrolytic affinity are applied. The electrode for a secondary battery is configured to have the two or more coating layers different from each other in active material particle size. As a result, output characteristics can be more improved in a case where the electrode is produced by using the coating layers different from each other in particle size depending on electrode position than in the case of single coating of electrode active materials of different particle sizes.