| 摘要 |
PROBLEM TO BE SOLVED: To provide a large discharging capacity and a good cycle characteristic even at high-rate discharging by solid-fusing any one or both of CoSi2 and NiSi2 indicating high electric conductivity in Fe of FeSi2 as a negative electrode material. SOLUTION: FeSi2 and CoSi2 for storing discharging lithium are mixed at a mol. ratio of 99:1, baking is performed in an argon atmosphere at a temperature of 1200 deg.C for 24 hours, and thereby a negative electrode active material Fe0.99 Co0.01 Si2 is obtained. The composition of this compound is identified by atomic absorption analysis, and its single phase is identified by X-ray diffraction. This compound is broken to 100 mesh under. For the obtained negative electrode active material powder 85 pts.wt., a binder of 10 pts.wt. and an acetylene black of 5 pts.wt. are kneaded, and dried by reduced pressure. A secondary coin battery thereby manufactured shows a good characteristic even at high-rate discharging. The same holds true for NiSi2 . If both are contained, a ratio is set to a mol. ratio of 99:1 of total or lower. |
