METHOD OF MANUFACTURING POROUS NEGATIVE ELECTRODE MATERIAL, NEGATIVE ELECTRODE MANUFACTURED BY THE METHOD, AND LITHIUM SECONDARY BATTERY INCLUDING THE SAME

摘要

PURPOSE: A manufacturing method of porous anode material is provided to easily control pore size and distribution in the porous anode material by controlling the size and content of polymer ball. CONSTITUTION: A manufacturing method of porous anode material comprises: a step of manufacturing a first particle by pulverizing Si or Sn group anode material; a step of mixing the Si or Sn group anode material with polymer ball and coupling agent, drying, and bulking; a step of pulverizing the bulked Si or Sn group anode material into a fixed size; and a step of manufacturing a second particle of the porous Si or Sn group anode material by removing the polymer ball with high temperature heating and sintering the coupling agent. [Reference numerals] (AA) Si or Sn based cathode active material; (BB) Polymer ball; (CC) Porous secondary particle