| abstract |
[problem] provides maintenance high circulation characteristic and initial capacity is also high, shows to balance the electrical equipment negative pole such as Li ion secondary batteries of good characteristic.A kind of [solution] electrical equipment negative pole, it is characterized in that, the electrode layer for including negative electrode active material, conductive auxiliary agent and binding agent with collector and the surface for being configured at foregoing collector, negative electrode active material include following formula (1)：Si x Sn y M z A a (in above-mentioned formula (1), M is at least one kind of metal in the group being made up of Al, V, C and combinations thereof, and foregoing A is inevitable impurity, and x, y, z and a represent quality % value, now, 0<x<100,0<y<100,0<z<100, and 0≤a<0.5, x+y+z+a=100.) shown in alloy, and the elongation (δ) of electrode layer be 1.29%<δ<1.70%. |