| abstract |
The present invention provides a method for manufacturing a negative electrode active material. The negative electrode active material includes a silicon compound SiO x , wherein 0.5≦x≦1.6, and the silicon compound includes lithium, and the method for manufacturing a negative electrode active material has the following steps: The step of bringing the silicon compound into which lithium has been inserted into contact with solution B, which contains polycyclic aromatic compound or its derivatives, or both, wherein solution B contains a solvent selected from ether solvents and ketone solvents , One or more of ester solvents, alcohol solvents, and amine solvents; and, the step of contacting the silicon compound with solution C, wherein the solution C contains as a solvent selected from ether-based materials, ketone-based materials, and ester-based materials One or more of the compounds, and include compounds having a quinoid structure in the molecule as the solute. Thereby, a method for manufacturing a negative electrode active material for a non-aqueous electrolyte secondary battery is provided, which can increase the capacity of the battery and improve the cycle characteristics. |