Negative active material for a rechargeable lithium battery, a method of preparing the same, and a rechargeable lithium battery including the same

摘要

A negative active material for a rechargeable lithium battery includes a core including an active material being capable of performing reversible electrochemical oxidation and reduction, and a coating layer on the surface of the core. The coating layer includes a reticular structure including —O-M-O— wherein M is selected Si, Ti, Zr, Al, or combinations thereof and an organic functional group linked to the M as a side chain. The organic functional group is selected from the group consisting of an alkyl group, a haloalkyl group, a substituted or unsubstituted aryl group, and combinations thereof. The negative active material for a rechargeable lithium battery according to the present invention can be applied along with an aqueous binder, and improve high capacity, good cycle-life, and particularly high capacity during charge and discharge at a high rate.

主权项

1. A negative active material for a rechargeable lithium battery, comprising:
a core comprising an active material being capable of performing reversible electrochemical oxidation and reduction, the active material selected from the group consisting of a lithium metal, a lithium-containing alloy, and a material being capable of reversibly forming a lithium-containing compound by reacting with lithium ions; and a coating layer on the surface of the core, the coating layer having a reticular structure including —O-M-O— wherein M is selected from the group consisting of Si, Ti, Zr, Al, and combinations thereof, and an organic functional group linked to the M as a side chain; wherein the organic functional group is a substituted aryl group which is an aryl group substituted by at least one functional group selected from the group consisting of an alkyl group, a haloalkyl group, and combinations thereof.