ELECTRODE STRUCTURE AND SECONDARY BATTERY
FIG17 is a cross-sectional view schematically showing a state in which an electrospray device discharges a raw material solution containing a particulate portion  FIG18 is a cross-sectional view schematically showing an example of the electrode group
The bead 233 typically does not contact the active material-containing layer 20b. The bead 233 may come into contact with the active material-containing layer 20b, but the effect of enhancing the adhesion between the organic fibers-including layer 23 and the active material-containing layer 20b is low. This is because the bead 233 does not come into contact with the active material-containing layer 20b in a state in which the solvent is contained. This will be described in detail with reference to FIG17. FIG17 is a cross-sectional view schematically showing a state in which an electrospray device discharges a raw material solution containing a particulate portion. As shown in FIG17, when a large amount of the raw material solution is locally discharged in the process of forming the organic fiber 231, a particulate portion 233p that is continuously connected to the thread-shaped raw material solution 231p is formed. Then, the solvent contained in the thread-shaped raw material solution 231p and the particulate portion 233p is almost completely evaporated before reaching the surface of the electrode 20. Therefore, the organic fiber 231 and the bead 233 that do not substantially contain the solvent are deposited on the electrode 20. Since the bead 233 does not substantially contain the solvent, the bead 233 is deposited on the organic fiber 231 without re-dissolving the organic fiber 231 deposited on the active material-containing layer 20b.  FIG18 is a cross-sectional view schematically showing an example of the electrode group. The electrode group 24 shown in FIG18 includes a first electrode 20, a second electrode 18, and a separator 22. The first electrode 20 and the second electrode 18 face each other with the separator 22 interposed therebetween. The second electrode 18 includes a current collector 18a, active material-containing layers 18b provided on both surfaces of the current collector 18a, and a tab 18c that is a portion of the current collector 18a where the active material-containing layers 18b are not provided. The active material-containing layer 18b may be provided on one side of the current collector 18a. In the electrode group shown in FIG18, the tab 18c and the tab 20c protrude in the same direction.
cross-sectional view
233
bead
51
spinning nozzle
24
electrode group
35
thickness was
18
electrode
232
resin mass resin masses
20
electrode
52
high voltage generator
500
electrospray device
23
organic fibers-including layer
['1. An electrode structure (10) comprising: an electrode (20) comprising an active material-containing layer (20b); and a separator (22) comprising a layer (23) provided on a main surface (S1) of the active material-containing layer (20b), wherein the layer (23) comprises organic fibers (231) and a resin mass (232), the resin mass (232) is in contact with a portion of the main surface (S1) of the active material-containing layer (20b) and is integrated with a portion of the organic fibers (231), and when a length of the resin mass (232) is represented by a circumscribed quadrilateral of the resin mass (232), a length of a first side of the circumscribed quadrilateral and a length of a second side adjacent to the first side are each 10 µm or more.']