Patent ID: 8999581
Filing Date: 2015-04-07
Classification: H01M,Y02E,Y02P

Abstract:
1. A negative active material for a rechargeable lithium battery comprising: a first graphite particle formed by first particle precursors having flake-shaped graphite pieces being linked to one another forming a curved side; and at least one second particle selected from the group consisting of an element particle, an element compound particle, a composite particle, and a carbon composite particle, and a combination particle thereat wherein the element particle is selected from the group consisting of Si, Sn, AI, Ge, Pb, and combinations thereof; the element compound particle is selected from the group consisting of Si, Sn, AI, Ge, Pb, and combinations thereof; the composite particle including at least one element selected from the group consisting of Si, Sn, AI, Ge, Pb, and combinations thereof; and the carbon composite particle including at least one element selected from the group consisting of Si, Sn, AI, Ge, Pb, and combinations thereof; wherein the at least one second particle is dispersed between the flake-shaped graphite pieces inside the first graphite particle; wherein the first particle precursors are exfoliated to the flake-shaped graphite pieces in a thickness range of 0.01 μm to 0.1 μm.