| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a carbon material of a negative electrode material for a secondary battery by effectively eliminating impurities such as metallic oxide e.g. contained in waste of crops. SOLUTION: This manufacturing method comprises a step (a) of cleaning with water agricultural waste which is selected from seeds or shells of fruit and a useless part or a stained lee in order to eliminate an impurity, a step (b) of heating the agricultural waste and drying, a step (c) of forming a solid/ liquid mixture by inserting it in a metallic halide aqueous solution, a step (d) of heating and drying the solid/liquid mixture, a step (e) of drying it in an inert gas atmosphere and thereafter performing a heat treatment to thereby obtain a carbon material, a step (f) of performing an acid treatment on the carbon material to thereby eliminate a metallic oxide, a step (g) of cleaning with water till cleaning water becomes neutral, and a step (h) of drying. |
