| 摘要 |
PURPOSE:To realize a long life by using an electrode which comprises a com pound with specific component containing Li whereby discharge polarization is reduced. CONSTITUTION:A compound, expressed by LixMzMo6S8-y, is used for a negative electrode 3. In the formula, M is an element selected from Na, Mg, Al, Ca, Sc, Mn, Fe, Co and 0<x<13, 0<=y<=0.5, 0<=z<=4. Li ion moves freely in and out three-dimensional skeleton comprising the elements represented by the formu la and Mo6S8-y. At the time, the energy necessary for the movement of Li<+> ion in crystal lattice is very small, and, therefore, the solution and deposition reaction of Li ion on the surface of electrode is advantageous. And therefore needle crystal of Li is difficult to grow on the surface of electrode. The fore going compound indicates good reversibility as an electrode, and an electrochemi cal cell such as secondary battery using it for a negative electrode 3 indicates a small capacity drop caused by repeated charging and discharging. |
