# US 10,319,955 B2 · Power storage device and electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,319,955 B2 - Document ID: US10319955B2 - Status: Granted - Kind: B2 - Application number: 15/176,350 - Filed: 2016-06-08 - Published: 2016-12-22 - Granted: 2019-06-11 - Earliest claimed: 2015-06-16 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Kosei Noda - Web page: https://patentgrep.com/patent/US10319955B2 ## CPC - H01M 10/0436: {Small-sized flat cells or batteries for portable equipment} - H01M 50/105: Pouches or flexible bags - H01M 50/117: Inorganic material - H01M 50/124: having a layered structure - H01M 50/133: Thickness - H01M 50/136: Flexibility or foldability - H01M 50/178: for pouch or flexible bag cells - H01M 50/55: on the same side of the cell - H01M 10/0459: {Cells or batteries with folded separator between plate-like electrodes} - H01M 50/557: Plate-shaped terminals - H01M 2220/30: Batteries in portable systems, e.g. mobile phone, laptop - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A power storage device with high capacity per unit volume, a flexible power storage device with a novel structure, a repeatedly bendable power storage device, a highly reliable power storage device, or a long-life power storage device is provided. The power storage device includes an inner structure and an exterior body surrounding the inner structure. The inner structure includes a positive electrode and a negative electrode. The exterior body includes a first film containing titanium and one or more elements selected from niobium, tantalum, vanadium, zirconium, and hafnium. It is preferable that the first film further contain one or more elements selected from molybdenum, chromium, and aluminum. ## Claims ### Claim 1 A power storage device comprising: an inner structure; and an exterior body surrounding the inner structure, wherein the inner structure comprises a positive electrode and a negative electrode, and wherein the exterior body comprises a first film containing an alloy comprising one of Ti—Nb—Ta—Zr—O and Ti—Ta—Nb—V—Zr—O. ### Claim 2 (depends on 1) The power storage device according to claim 1, further comprising an electrolytic solution surrounded by the exterior body. ### Claim 3 (depends on 1) The power storage device according to claim 1, wherein the first film further contains one or more elements selected from molybdenum, chromium, and aluminum. ### Claim 4 (depends on 1) The power storage device according to claim 1, wherein the first film comprises a region with a thickness of more than or equal to 10 μm and less than or equal to 150 μm. ### Claim 5 (depends on 1) The power storage device according to claim 1, wherein the first film comprises a region with a density of more than or equal to 5 g/cm3 and less than or equal to 6 g/cm3. ### Claim 6 (depends on 1) The power storage device according to claim 1, wherein the exterior body further comprises a second film in contact with the first film, and wherein the second film contains an organic material. ### Claim 7 (depends on 6) The power storage device according to claim 6, wherein the exterior body further comprises a third film in contact with the first film, wherein the third film contains an organic material, and wherein the first film is between the second film and the third film. ### Claim 8 (depends on 1) The power storage device according to claim 1, wherein the exterior body is flexible. ### Claim 9 (depends on 1) An electronic device comprising: the power storage device according to claim 1; a display; and an operation button. ### Claim 10 A power storage device comprising: an inner structure; and an exterior body surrounding the inner structure, wherein the inner structure comprises a plurality of stacks, and wherein the exterior body comprises a first film containing an alloy comprising one of Ti—Nb—Ta—Zr—O and Ti—Ta—Nb—V—Zr—O. ### Claim 11 (depends on 10) The power storage device according to claim 10, wherein each stack includes a negative electrode current collector, a negative electrode active material layer, a separator, a positive electrode active material layer, and a positive electrode current collector. ### Claim 12 (depends on 10) The power storage device according to claim 10, further comprising an electrolytic solution surrounded by the exterior body. ### Claim 13 (depends on 10) The power storage device according to claim 10, wherein the first film further contains one or more elements selected from molybdenum, chromium, and aluminum. ### Claim 14 (depends on 10) The power storage device according to claim 10, wherein the first film comprises a region with a thickness of more than or equal to 10 μm and less than or equal to 150 μm. ### Claim 15 (depends on 10) The power storage device according to claim 10, wherein the first film comprises a region with a density of more than or equal to 5 g/cm3 and less than or equal to 6 g/cm3. ### Claim 16 (depends on 10) The power storage device according to claim 10, wherein the exterior body further comprises a second film in contact with the first film, and wherein the second film contains an organic material. ### Claim 17 (depends on 16) The power storage device according to claim 16, wherein the exterior body further comprises a third film in contact with the first film, wherein the third film contains an organic material, and wherein the first film is between the second film and the third film. ### Claim 18 (depends on 10) The power storage device according to claim 10, wherein the exterior body is flexible. ### Claim 19 (depends on 10) An electronic device comprising: the power storage device according to claim 10; a display; and an operation button. ### Claim 20 (depends on 1) The power storage device according to claim 1, wherein the exterior body further comprises a flexible thin film in contact with the first film, and wherein the flexible thin film comprises at least one of aluminum, stainless steel, copper, nickel, and a graphene compound. ### Claim 21 (depends on 1) The power storage device according to claim 1, wherein the power storage device is flexible. ### Claim 22 (depends on 10) The power storage device according to claim 10, wherein the exterior body further comprises a flexible thin film in contact with the first film, and wherein the flexible thin film comprises at least one of aluminum, stainless steel, copper, nickel, and a graphene compound. ### Claim 23 (depends on 10) The power storage device according to claim 10, wherein the power storage device is flexible.