| 摘要 |
PROBLEM TO BE SOLVED: To provide a nonaqueous electrolyte secondary battery arranged so that the safety when it is overcharged can be ensured without using a current interrupt device (CID).SOLUTION: A nonaqueous electrolyte secondary battery comprises a battery exterior body with no CID, and in the battery exterior body, a positive electrode, a negative electrode, a separator and a nonaqueous electrolyte. The separator has a shutdown function. The positive electrode includes LiNiCoMO(where a+b+c=1; 0<a<1; 0<b<1; 0<c<1; M is at least one of Mn and Al). The negative electrode includes a graphite-based negative electrode active material. The nonaqueous electrolyte includes cyclohexylbenzene. Supposing that the total capacitance of the negative electrode is x, and the content of the cyclohexylbenzene in the nonaqueous electrolyte is y, a point (x,y) falls within a polygonal region having five apices consisting of: (14.82, 0.05); (34.19; 0.3); (34.19, 4.5); (19.95, 5.3) and (14.82, 5.5). |
