Negative active material, negative electrode, and lithium battery

摘要

A negative active material includes a conductive unit bound in island-like form to silicon-based nanowires on a carbonaceous base. Such negative active material may improve the electrical conductivity of the silicon-based nanowires, and suppress separation of the silicon-based nanowires caused from volume expansion, and thus may improve lifetime characteristics of a lithium battery.

主权项

1. A negative active material comprising:
at least one silicon-based nanowire on a carbonaceous base; and a conductive unit bound to the silicon-based nanowire in island-like form, wherein the conductive unit comprises a material selected from the group consisting of an elemental metal, an alloy thereof, and a metal oxide, the elemental metal being selected from the group consisting of nickel (Ni), copper (Cu), platinum (Pt), ruthenium (Ru), iron (Fe), cobalt (Co), gold (Au), chromium (Cr), molybdenum (Mo), tungsten (W), manganese (Mn), technetium (Tc), rhenium (Re), osmium (Os), rhodium (Rh), iridium (Ir), palladium (Pd), silver (Ag), zinc (Zn), and aluminum (Al), and the metal of the metal oxide being selected from the group consisting of copper (Cu), platinum (Pt), ruthenium (Ru), iron (Fe), gold (Au), chromium (Cr), molybdenum (Mo), tungsten (W), technetium (Tc), rhenium (Re), osmium (Os), rhodium (Rh), iridium (Ir), palladium (Pd), silver (Ag), zinc (Zn), and aluminum (Al), wherein the carbonaceous base is spherical.