Patent ID: 9099736
Filing Date: 2015-08-04
Classification: C01G,C01P,H01M,Y02E,Y02T

Abstract:
1. A cathode active material comprising a composite of a layer-structured lithium manganese-based oxide and different kinds of carbon-based conductive materials, wherein the layer-structured lithium manganese-based oxide includes lithium (Li), manganese (Mn) and an element (M), wherein the layer-structured lithium manganese-based oxide has a molar content of Mn greater than a molar content of M, wherein the layer-structured lithium manganese-based oxide includes 1 mole or more of lithium (Li) with respect to 1 mole of the layer-structured lithium manganese-based oxide, wherein the layer-structured lithium manganese-based oxide has a plateau potential range in which lithium deintercalation as well as oxygen release occurs during initial charging in a high voltage range of 4.4 V or more, wherein the different kinds of carbon-based conductive materials comprise a first carbon-based material and a second carbon-based material, wherein a particle diameter of the first carbon-based material is larger than a particle diameter of the second carbon-based material, and wherein the layer-structured lithium manganese-based oxide has a composition of the following Chemical Formula 1: (where 0<a≦0.2, x>(1−a)/2, and M is one or more selected from the group consisting of Mn, nickel (Ni), cobalt (Co), iron (Fe), chromium (Cr), vanadium (V), copper (Cu), zinc (Zn), titanium (Ti), aluminum (Al), magnesium (Mg), and boron (B)).