ELECTRODE FOR LITHIUM-ION SECONDARY BATTERY, AND LITHIUM-ION SECONDARY BATTERY USING SAID ELECTRODE

摘要

This electrode for a lithium-ion secondary battery is provided with: an electrode film containing a conductive auxiliary, a binder, and an active material; and an electrode foil, on the surface of which the electrode film is formed. The conductive auxiliary is carbon nanofibers, and 0.1-3.0 mass% of the carbon nanofibers is included relative to 100 mass% of the electrode film. When the binder uses an organic solvent as a solvent, 1.0-8.0 mass% of the binder from which the organic solvent has been removed is included relative to 100 mass% of the electrode film. The active material constitutes the remaining percentage. The active material comprises a mixed powder of rough powder having an average particle diameter of 1-20mum and fine powder having an average particle diameter 1/3-1/10 of the average particle diameter of the rough powder. The void fraction of the electrode film is 10-30%.