NONAQUEOUS ELECTROLYTE SECONDARY BATTERY

摘要

A nonaqueous electrolyte secondary battery 100 according to the present invention is provided with an electrode assembly 80 having a structure in which a positive electrode 10 and a negative electrode 20 are stacked with a separator 30 interposed therebetween. A porous filler layer 32 is formed between the positive electrode 10 and the separator 30. The filler layer 32 contains a filler made of an inorganic material and contains a binder. The relationship T>D holds where T is the average thickness of the filler layer 32 and D is the average particle diameter of a positive electrode active material 15 present in the positive electrode 10 facing the filler layer 32, and a pressure applied to the electrode assembly 80 in the stacking direction is set to at least 0.1 MPa.

主权项

1. A nonaqueous electrolyte secondary battery comprising an electrode assembly having a structure in which a positive electrode and a negative electrode are stacked with a separator interposed therebetween, wherein
a porous filler layer formed on a surface of the separator is disposed between the positive electrode and the separator, the filler layer contains a filler made of an inorganic material and contains a binder, an average particle diameter of the filler is from at least 0.5 μm to not more than 2 μm, the proportion of the filler in the filler layer as a whole is at least 90 mass %, an average thickness T of the filler layer is from at least 6 μm to not more than 20 μm, an average particle diameter D of a positive electrode active material present in the positive electrode facing the filler layer is at least 1 μm, and the relationship T>D holds, and a pressure applied to the electrode assembly in the stacking direction is set to at least 0.1 MPa.