Method for manufacturing anode material for secondary battery using lignocellulosic biomass

A method for manufacturing an anode material for a secondary battery using lignocellulosic biomass as a raw material, the method comprising the steps of:

• (a) obtaining a hydrolyzed reaction product, which includes a lignin-microfibrillated cellulose complex obtained by adding an acid to lignocellulosic biomass to hydrolyze at least part of the hemicellulose in the lignocellulosic biomass and simultaneously convert at least part of the cellulose into microfibrillated cellulose (MFC);
• (b) adding an aqueous alkaline solution to the lignin-microfibrillated cellulose complex-containing hydrolyzed reaction product obtained in step (a) to further remove residual acidic components and water-soluble metal components contained in the lignin-microfibrillated cellulose complex, and then separating the aqueous component to obtain solid particles of the lignin-microfibrillated cellulose complex;
• (c) grinding the solid particles of the lignin-microfibrillated cellulose complex obtained in step (b) to obtain ground solid particles of the lignin-microfibrillated cellulose complex;
• and
• (d) heat-treating the ground solid particles of the lignin-microfibrillated cellulose complex obtained in step (c) to modify at least a portion of the solid particles into a crystalline or amorphous carbon material.