Patent ID: 8715858
Filing Date: 2014-05-06
Classification: C01G,C01P,H01M,Y02E,Y10T

Abstract:
1. A method for preparing a lithium manganese oxide positive active material for a lithium ion secondary battery including spherical spinel-type lithium manganese oxide particles having two or more different sizes, the method comprising: performing a pre-treatment process by dissolving manganese oxide in an acidic or basic solution and heat treating to obtain a first manganese oxide having particles of a first size; mixing said first manganese oxide with a second manganese oxide having particles of a second size, different from said first size, to obtain a first mixture; uniformly mixing said first mixture with a lithium containing compound to obtain a second mixture; and heat treating said second mixture to obtain the lithium manganese oxide positive active material comprising a first lithium manganese oxide having particles of a third size, and a second lithium manganese oxide having particles of a forth size, different from said third size.