Patent ID: 9722241
Date: 2017-08-01
CPC Classifications: C01G,C01P,H01M,Y02E

Claim:
1. A positive active material for a rechargeable lithium battery comprising: a core comprising an overlithiated oxide represented by Chemical Formula 1; a first coating layer on the core comprising a compound having a spinel structure; and a second coating layer on the first coating layer comprising a compound represented by Chemical Formula 2, wherein the compound having a spinel structure has a peak between about 2.6 V and about 2.7 V in a graph of differential capacity dQ/dV versus voltage, the voltage of the graph being between about 4.7 V and about 2.5 V: wherein 0<x<1, 0<a<1, 0<b<1, 0<c<1, and a+b+c=1, wherein 0≦d<1 and 0<e≦1.