# US 12,191,440 B2 · Nonaqueous secondary battery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,440 B2 - Document ID: US12191440B2 - Status: Granted - Kind: B2 - Application number: 18/228,732 - Filed: 2023-08-01 - Published: 2023-11-30 - Granted: 2025-01-07 - Earliest claimed: 2013-11-15 - Assignees: Semiconductor Energy Laboratory Co., Ltd. - Applicants: Semiconductor Energy Laboratory Co., Ltd. - Inventors: Shunpei Yamazaki - Web page: https://patentgrep.com/patent/US12191440B2 ## CPC - H01M 10/0525: Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries - H01M 50/449: having a layered structure - H01M 50/457: comprising three or more layers - H01M 50/119: Metals - H01M 50/126: comprising three or more layers - Y02E 60/10: Energy storage using batteries - Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - 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 - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract To provide a novel structure of a separator in a secondary battery. A nonaquesous secondary battery includes a positive electrode, a negative electrode, an electrolyte solution, a first separator, and a second separator. The first separator and the second separator are provided between the positive electrode and the negative electrode. The first separator is provided with a first pore, the second separator is provided with a second pore, and the size of the first pore is different from the size of the second pore. Furthermore, the proportion of the volume of the first pores in the first separator is different from the proportion of the volume of the second pores in the second separator. ## Claims ### Claim 1 A nonaqueous secondary battery comprising: a positive electrode; a negative electrode; and a stacked-layer structure between the positive electrode and the negative electrode, the stacked-layer structure including a first separator and a second separator, wherein the first separator is over the positive electrode, wherein the second separator is over and in contact with the first separator, wherein the first separator includes a first pore, wherein the second separator includes a second pore, wherein a size of the second pore is smaller than a size of the first pore, and wherein the first separator comprises cellulose. ### Claim 2 (depends on 1) The nonaqueous secondary battery according to claim 1, wherein a thickness of the second separator is smaller than a thickness of the first separator. ### Claim 3 (depends on 1) The nonaqueous secondary battery according to claim 1, wherein the positive electrode comprises a positive electrode active material layer, wherein the positive electrode active material layer comprises a positive electrode active material, and wherein the positive electrode active material comprises a lithium-containing material having any one of an olivine crystal structure, a layered rock-salt crystal structure, and a spinel crystal structure. ### Claim 4 (depends on 3) The nonaqueous secondary battery according to claim 3, wherein the positive electrode active material layer further comprises a conductive additive including any one of acetylene black, graphite particles, carbon nanotubes, graphene, and fullerene. ### Claim 5 (depends on 1) The nonaqueous secondary battery according to claim 1, wherein the negative electrode comprises a negative electrode active material layer, wherein the negative electrode active material layer comprises a negative electrode active material, and wherein the negative electrode active material comprises any one of graphite, graphitizing carbon, non-graphitizing carbon, a carbon nanotube, graphene, carbon black, and a material including at least one of Ga, Si, Al, Ge, Sn, Pb, Sb, Bi, Ag, Zn, Cd and In. ### Claim 6 (depends on 1) The nonaqueous secondary battery according to claim 1, wherein the negative electrode is enveloped by the second separator. ### Claim 7 A nonaqueous secondary battery comprising: a positive electrode; a negative electrode; and a stacked-layer structure between the positive electrode and the negative electrode, the stacked-layer structure including a first separator and a second separator, wherein the first separator is over the positive electrode, wherein the second separator is over and in contact with the first separator, wherein the first separator includes first pores, wherein the second separator includes second pores, wherein a proportion of a volume of the second pores in the second separator is lower than a proportion of a volume of the first pores in the first separator, and wherein the first separator comprises cellulose. ### Claim 8 (depends on 7) The nonaqueous secondary battery according to claim 7, wherein a thickness of the second separator is smaller than a thickness of the first separator. ### Claim 9 (depends on 7) The nonaqueous secondary battery according to claim 7, wherein the positive electrode comprises a positive electrode active material layer, wherein the positive electrode active material layer comprises a positive electrode active material, and wherein the positive electrode active material comprises a lithium-containing material having any one of an olivine crystal structure, a layered rock-salt crystal structure, and a spinel crystal structure. ### Claim 10 (depends on 9) The nonaqueous secondary battery according to claim 9, wherein the positive electrode active material layer further comprises a conductive additive including any one of acetylene black, graphite particles, carbon nanotubes, graphene, and fullerene. ### Claim 11 (depends on 7) The nonaqueous secondary battery according to claim 7, wherein the negative electrode comprises a negative electrode active material layer, wherein the negative electrode active material layer comprises a negative electrode active material, and wherein the negative electrode active material comprises any one of graphite, graphitizing carbon, non-graphitizing carbon, a carbon nanotube, graphene, carbon black, and a material including at least one of Ga, Si, Al, Ge, Sn, Pb, Sb, Bi, Ag, Zn, Cd and In. ### Claim 12 (depends on 7) The nonaqueous secondary battery according to claim 7, wherein the negative electrode is enveloped by the second separator.