ELECTRODE FOR LITHIUM ION SECONDARY BATTERIES, AND LITHIUM ION SECONDARY BATTERY

Exudation of an electrolytic solution from an electrode is to be prevented. An electrode for a lithium-ion secondary battery including an electrode active material and a semi-solid electrolyte, in which the semi-solid electrolyte includes an organic solvent or an ionic liquid, and a lithium salt, the electrode for the lithium-ion secondary battery includes a nanofiber, in which the nanofiber is cellulose-based or polyacrylate-based resin; the nanofiber has a wire diameter of 0.01 µm or more and 1 µm or less; and the average value of the pore diameter of an electrode mixture layer removing the ionic liquid and the lithium salt from the electrode for the lithium-ion secondary battery measured by a mercury porosimeter is 0.001 µm or more and 0.5 µm or less.