The disclosed invention consists of a multi-
cell monolithic thin-film battery (0) in which two or more monolithic battery cells, each comprising a
cathode current collector (20), a
cathode electrode layer (21), a
solid electrolyte layer (22), and an
anode current collector (23), are stacked on top of each other on a single-layer substrate (1). All of the monolithic battery cells (2, 2') have a thickness of 10 nm or more and 20 μm or less and are manufactured by a thin-film technology that does not use an
anode layer, and thus are referred to as monolithic
anode-free battery cells (2, 2'). It is based on an implementable method for improving characteristics and joining multiple cells to form a stacked thin-film battery. The disclosed invention is achieved by stacking all of the
layers of the resulting multi-
cell monolithic thin-film battery (0) on top of each other on a single-layer substrate (1), and laminating a
blocking layer as a layer of a material that blocks electrons and ions between the
cathode current collector (20) and the anode current collector (23) of each adjacent monolithic anode-free
battery cell (2, 2'), setting the stacking thickness of the
blocking layer to 5 nm or more and 1 μm or less, and laminating the first layer of the next adjacent monolithic anode-free
battery cell (2') on top of the last layer of the immediately preceding monolithic anode-free
battery cell (2).