Verfahren zur Herstellung eines Elektrodenmaterials für Sekundärbatterie mit nichtwasserigem Elektrolyt

摘要

The invention provides a nonaqueous electrolyte secondary battery having a positive electrode, a negative electrode and a nonaqueous electrolyte. The positive electrode or the negative electrode is prepared from a material capable of electrochemically absorbing and desorbing an alkali metal ion. The electrode material comprises a disordered material having at least two structures selected from among an amorphous structure, finely crystalline structure and polycrystalline structure lacking in a long-distance order and having a lower order than an ordered crystal structure. Specifically stated, the disordered material is obtained by irradiating a polycrystalline substance lacking in long-distance order with an argon plasma. The battery is improved in cycle characteristics and preservation characteristics.