Method for manufacturing nonaqueous secondary battery electrode

摘要

A method is provided for manufacturing an electrode that has a porous inorganic layer on the surface of an active material layer and is suitable for constructing a nonaqueous secondary battery with excellent input-output performance. In this manufacturing method, an electrode perform, which has an active material layer (344) consisting primarily of active material particles (42) and supported on a collector (342), is prepared. The water concentration of at least the surface (344a) of the active material layer (344) is adjusted to 100 ppm to 500 ppm. A slurry (S) containing inorganic particles (44), a binder and an organic solvent is coated on the surface (344a) of the active material layer with the water concentration thus adjusted, to form a porous inorganic layer.

主权项

1. A method for manufacturing a nonaqueous secondary battery negative electrode having a porous inorganic layer on a negative electrode active material layer, the method comprising the following steps performed in the sequence set forth:
preparing a negative electrode preform that has a negative electrode active material layer consisting primarily of negative electrode active material particles and supported on a collector, wherein the negative electrode active material layer is prepared by applying a liquid composition containing the negative electrode active material particles dispersed in a water-based solvent to the collector, and drying the liquid composition; adjusting a water concentration of the negative electrode active material layer so that a water concentration of at least the surface of the negative electrode active material layer is 100 ppm to 500 ppm, wherein the adjustment of the water concentration of the negative electrode active material layer is performed separately from the preparation of the negative electrode preform; and coating a slurry containing inorganic particles, a binder and an organic solvent on the surface of the negative electrode active material layer with the water concentration thus adjusted, to form a porous inorganic layer.