ANODE ACTIVE MATERIAL OF SILICON-CARBON COMPOSITE WITH CORE-SHELL STRUCTURE, MANUFACTURING METHOD FOR THE SAME AND LITHIUM SECONDARY BATTERY COMPRISING THE ANODE ACTIVE MATERIAL

摘要

PURPOSE: An anode active material of a silicon-carbon composite is provided to prevent volume expansion and reaction area, thereby preventing powderizing of a negative electrode, thereby improving cycle performance of a lithium secondary battery. CONSTITUTION: An anode active material for a lithium secondary battery includes a core(110) including a silicon nanoparticle, and a shell(120) surrounding the core. The shell consists of carbon. A manufacturing method of the negative electrode active material comprises a step of forming a core-shell structure including a first polymer which includes a second polymer as a core and a shell surrounding the outer side of the second polymer, by simultaneously electrospinning a first polymer and a second polymer including a silicon nanoparticle; and a shell carbonizing the shell of the structure by heat-treating the core-shell structure.