Abstract: A secondary battery 10 includes a first electrode 11, a first current collection part 12, a second electrode 16, and a separation membrane 21. The first electrode 11 is a columnar body including a first active material. The first current collection part 12 is connected to the first electrode. The second electrode 16 includes a second active material. The separation membrane 21 has ionic conductivity and insulates the first electrode 11 from the second electrode 16. The secondary battery 10 has a structure in which a plurality of the first electrodes 11 are bundled together, with each of the first electrodes 11 being adjacent to the second electrode 16 with the separation membrane 21 disposed therebetween. The plurality of the first electrodes 11 is connected to the first current collection part 12 via a connection part 13 formed of a low-melting-point metal.

Abstract: A secondary battery 10 includes a first electrode 11, a first current collection part 12, a second electrode 16, and a separation membrane 21. The first electrode 11 is a columnar body including a first active material. The first current collection part 12 is connected to the first electrode. The second electrode 16 includes a second active material. The separation membrane 21 has ionic conductivity and insulates the first electrode 11 from the second electrode 16. The secondary battery 10 has a structure in which a plurality of the first electrodes 11 are bundled together, with each of the first electrodes 11 being adjacent to the second electrode 16 with the separation membrane 21 disposed therebetween. The plurality of the first electrodes 11 is connected to the first current collection part 12 via a connection part 13 formed of a low-melting-point metal.

Abstract: An all-solid lithium secondary battery 20 includes a solid electrolyte layer 10 composed of a garnet-type oxide, a positive electrode 12 formed on one surface of the solid electrolyte layer 10 and a negative electrode 14 formed on the other surface of the solid electrolyte layer 10. This all-solid lithium secondary battery 20 includes an integrally sintered complex of the solid electrolyte layer 10 and the positive electrode active material layer 12a. This complex is obtained by integrally sintering a stacked structure of an active material layer and a solid electrolyte layer. The solid electrolyte layer includes: abase material mainly including a fundamental composition of Li7+X?Y(La3?x,Ax) (Zr2?Y,TY)O12, wherein A is one or more of Sr and Ca, T is one or more of Nb and Ta, and 0?X?1.0 and 0?Y<0.75 are satisfied, as a main component; and an additive component including lithium borate and aluminum oxide.

Abstract: An all-solid lithium secondary battery 20 includes a solid electrolyte layer 10 composed of a garnet-type oxide, a positive electrode 12 formed on one surface of the solid electrolyte layer 10 and a negative electrode 14 formed on the other surface of the solid electrolyte layer 10. This all-solid lithium secondary battery 20 includes an integrally sintered complex of the solid electrolyte layer 10 and the positive electrode active material layer 12a. This complex is obtained by integrally sintering a stacked structure of an active material layer and a solid electrolyte layer. The solid electrolyte layer includes: abase material mainly including a fundamental composition of Li7+X?Y(La3?x,Ax) (Zr2?Y,TY)O12, wherein A is one or more of Sr and Ca, T is one or more of Nb and Ta, and 0?X?1.0 and 0?Y<0.75 are satisfied, as a main component; and an additive component including lithium borate and aluminum oxide.