Meanwhile, when expansion and contraction (a volume change) of an active material occur with charging and discharging, a good bonding state is not maintained at the interface, and the resistance may increase in some cases.įor example, while a Si-based active material is known as a negative electrode active material having a high capacity, its volume change caused by charging and discharge is significant. In solid-state batteries, the bonding state of an interface significantly affects cell performance because ions and electrons are conducted by using an interface between a solid and a solid. This is because it is difficult to maintain mechanical characteristics of a sulfide solid electrolyte against expansion and contraction of the negative electrode active material caused by charging and discharging, and peeling or cracking occurs at an interface between a negative electrode layer and a solid electrolyte layer, at an interface between the negative electrode active material and the solid electrolyte layer, or inside of the solid electrolyte layer.Īccordingly, it is an object of the present disclosure to provide a solid-state battery capable of improving cycle characteristics in view of the aforementioned problems. In solid-state batteries, cycle characteristics (e.g., capacity retention) decrease due to a volume change of a negative electrode active material during charging and discharging. JP 2018-142534 A SUMMARY OF THE INVENTION Problems to be Solved by the Invention Patent Document 4 discloses a configuration in which a solid electrolyte layer and a side surface of a stack are formed of the same member. Patent Document 3 discloses a configuration in which a solid electrolyte material made of a sulfide solid electrolyte material or an oxide solid electrolyte material is contained in an insulating portion of a solid electrolyte layer and a side surface of a stack. ![]() Patent Document 2 discloses a bipolar type lithium ion battery having a bipolar electrode current collector in which a first current collector, an adhesive resin layer having a through hole, and a second current collector are stacked in this order, and the first current collector and the second current collector are bonded by using the adhesive resin layer. ![]() Patent Document 1 discloses a solid-state battery having a resin layer covering a side surface of a solid-state battery stack, and shows that a sulfide solid electrolyte is used. The present disclosure relates to a solid-state battery.
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