NEGATIVE ELECTRODES FOR SECONDARY BATTERY, COPPER FOIL FOR ELECTRODE, SECONDARY BATTERY, AND PROCESSES FOR PRODUCING NEGATIVE ELECTRODES FOR SECONDARY BATTERY

摘要

Negative electrodes for nonaqueous-electrolyte secondary batteries are provided with which a high capacity is obtained in charge/discharge and the capacity can be inhibited from decreasing even through repeated cycles of charge/discharge. One of the negative electrodes for secondary batteries is obtained by forming a coating film of a silicon-based negative active material on a current collector having a given surface, the coating film having a given thickness and containing silicon hydride having a given hydrogen concentration. Another is obtained by forming a coating film of a silicon-based negative active material on a current collector having a given surface shape by a given method, the coating film having a given surface shape. Still another negative electrode is obtained by forming a coating film of a silicon-based negative active material on a current collector by a given method, the coating film having a given value of the reciprocal of electric double layer capacitance.