| 摘要 |
PROBLEM TO BE SOLVED: To enable a negative electrode to be subjected to high capacity and high density charging so as to be subjected to high energy densification by including a compound of silicon and plural kinds of element selected out of group Va of the periodic table and by making a nuclear magnetic resonance signal to be generated in a specific range relative to lithium chloride reference. SOLUTION: A compound of SiP0.5 CO0.5 , a conductive assistant of graphite powder and a binding agent of polyvinylidene fluoride are combined at the rates of 80%, 15%, 5% respectively, and solvent N-methyl-2-pyrrolidone is added thereto and mixed, and the mixture is applied to a Cu foil and dried, then a test electrode 12 is formed. Lithium metal 10, a separator 11 and the test electrode 12 of the negative electrode active material are sequentially laminated to form a model battery. Thereby, lithium is stored in the state ion in the negative active material and a nuclear magnetic resonance signal is generated in a range from 5 to 40ppm relative to the lithium chloride reference so as to enable high charging/discharging cycle characteristics. |
