| 摘要 |
PROBLEM TO BE SOLVED: To provide a secondary battery negative electrode having a high capacity and excellent cycle characteristics by forming a coating film composed of a negative electrode material containing silicon and a binder forming a hardly graphitized carbon by a heat treatment on a collector and by sintering it under the non oxide atmosphere to integrate it into the collector. SOLUTION: In a production of this negative electrode for nonaqueous secondary battery, since a binder is hard to be graphitized and becomes an amorphous carbon with less volume variation, it is sintered with the formation of a coating film maintained. The amorphous carbon further forms a conductive network in the sintered element and the conductivity of the sintered element is enhanced. Additionally, as the binder is solidified and carbonized with a collector held close contact with the sintered element, the contact of the collector with the sintered element is enhanced and the contact resistance between the collector and the sintered element can be reduced. Furthermore, a residual rate of the binder after sintered is 5 wt.% or more. When the residual rate is 5 wt.% or more, the sufficient adhesion is secured for reducing the contact resistance between the collector and the sintered element. |
