# US 8,785,040 B2 · Positive electrode for rechargeable lithium battery, method for manufacturing the same, and rechargeable lithium battery including the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,785,040 B2 - Document ID: US8785040B2 - Status: Granted - Kind: B2 - Application number: 12/886,778 - Filed: 2010-09-21 - Published: 2011-05-26 - Granted: 2014-07-22 - Earliest claimed: 2009-11-23 - Assignees: Samsung SDI Co., Ltd. - Applicants: Nam-Soon Choi; Sae-Weon Roh; Yong-Chul Park; Sung-Soo Kim; So-Hyun Hur - Inventors: Nam-Soon Choi; Sae-Weon Roh; Yong-Chul Park; Sung-Soo Kim; So-Hyun Hur - Web page: https://patentgrep.com/patent/US8785040B2 ## CPC - H01M 10/052: Li-accumulators - H01M 4/043: {involving compressing or compaction} - H01M 4/621: {Binders} - H01M 4/622: {being polymers} - H01M 4/623: {fluorinated polymers} - H01M 4/74: Meshes or woven material; Expanded metal - H01M 2004/028: {Positive electrodes} - Y02E 60/10: Energy storage using batteries - Y10T 156/1092: All laminae planar and face to face - 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 - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A positive electrode for a rechargeable lithium battery including a net-type current collector and a positive active material layer formed on both sides of the current collector and also including a positive active material and a binder and having a thickness of about 150 μm or more, a method of manufacturing the same, and a rechargeable lithium battery including the same. ## Claims ### Claim 1 A positive electrode for a rechargeable lithium battery, comprising: a mesh-like current collector; and a positive active material layer formed on both sides of the current collector and comprising a positive active material and a binder, wherein the positive active material consists of an active material selected from the group consisting of LiCoO2, LiMn2O4, LiFePO4, and combinations thereof, and wherein the binder comprises a first binder selected from the group consisting of polyvinylidene fluoride, a polyvinylidene fluoride-hexafluoropropylene copolymer, a polyvinylidene fluoride-trifluoroethylene phosphate copolymer, and combinations thereof, and a second binder selected from the group consisting of polyvinyl acetate, polymethylmethacrylate, a polymethylmethacrylate-ethylmethacrylate copolymer, a polymethylmethacrylate-butylmethacrylate copolymer, polyethylene oxide, polyethylene glycol-grafted polymethylmethacrylate, polyvinyl chloride, a polyvinyl chloride-methylmethacrylate copolymer, and combinations thereof, wherein the positive electrode has a thickness of about 150 μm or more. ### Claim 2 (depends on 1) The positive electrode of claim 1, wherein the current collector is aluminum. ### Claim 3 (depends on 1) The positive electrode of claim 1, wherein the positive active material layer comprises about 80 to about 95 wt % of the positive active material and about 5 to about 20 wt % of the binder. ### Claim 4 (depends on 1) The positive electrode of claim 1, wherein the first binder comprises polyvinylidene fluoride, and the second binder is selected from the group consisting of polyvinyl acetate, polymethylmethacrylate, polyethylene oxide, polyvinyl chloride, and copolymers thereof. ### Claim 5 (depends on 1) The positive electrode of claim 1, wherein the first binder is polyvinylidene fluoride-hexafluoropropylene copolymer comprising about 4 to about 20 wt % of hexafluoropropylene. ### Claim 6 (depends on 1) The positive electrode of claim 1, wherein the binder comprises about 50 to about 99 wt % of the first binder and about 1 to about 50 wt % of the second binder. ### Claim 7 (depends on 1) The positive electrode of claim 1, wherein the positive active material layer further comprises a conductive material. ### Claim 8 (depends on 7) The positive electrode of claim 7, wherein the positive active material layer comprises about 65 to about 85 wt % of the positive active material, about 5 to about 20 wt % of the binder, and about 5 to about 10 wt % of the conductive material. ### Claim 9 (depends on 1) The positive electrode of claim 1, wherein the positive electrode is about 150 to about 2000 μm thick. ### Claim 10 (depends on 1) The positive electrode of claim 1, wherein the positive electrode is about 150 to about 1000 μm thick. ### Claim 11 (depends on 1) The positive electrode of claim 1, wherein the positive electrode has an average porosity of about 30 volume % or more. ### Claim 12 (depends on 1) A method of manufacturing the positive electrode of claim 1 for a rechargeable lithium battery, comprising: preparing a positive active material composition comprising a positive active material and a binder; coating the positive active material composition on a substrate to prepare a positive active material layer; disposing the positive active material layer on both sides of a net-type current collector; and hot-pressing the positive active material layer and the current collector at least one time to form positive active material layers on each side of the current collector, wherein the positive electrode is about 150 μm thick or more. ### Claim 13 A rechargeable lithium battery comprising: a positive electrode; a negative electrode; and a separator disposed between the positive and negative electrodes, wherein the positive electrode comprises: a mesh-like current collector and a positive active material layer formed on both sides of the current collector, the positive active material layer comprises a positive active material and a binder, wherein the positive active material consists of an active material selected from the group consisting of LiCoO2, LiMn2O4, LiFePO4, and combinations thereof, and wherein the binder comprises a first binder selected from the group consisting of polyvinylidene fluoride, a polyvinylidene fluoride-hexafluoropropylene copolymer, a polyvinylidene fluoride-trifluoroethylene phosphate copolymer, and combinations thereof, and a second binder selected from the group consisting of polyvinyl acetate, polymethylmethacrylate, a polymethylmethacrylate-ethylmethacrylate copolymer, a polymethylmethacrylate-butylmethacrylate copolymer, polyethylene oxide, polyethylene glycol-grafted polymethylmethacrylate, polyvinyl chloride, a polyvinyl chloride-methylmethacrylate copolymer, and combinations thereof, and the positive electrode is about 150 μm thick or more. ### Claim 14 (depends on 13) The rechargeable lithium battery of claim 13, wherein the current collector is aluminum. ### Claim 15 (depends on 13) The rechargeable lithium battery of claim 13, wherein the positive active material layer comprises about 80 to about 95 wt % of the positive active material and about 5 to about 20 wt % of the binder. ### Claim 16 (depends on 13) The rechargeable lithium battery of claim 13, wherein the first binder comprises polyvinylidene fluoride, and the second binder is selected from the group consisting of polyvinyl acetate, polymethylmethacrylate, polyethylene oxide, polyvinyl chloride, and copolymers thereof. ### Claim 17 (depends on 13) The rechargeable lithium battery of claim 13, wherein the first binder is polyvinylidene fluoride-hexafluoropropylene copolymer comprising about 4 to about 20 wt % of hexafluoropropylene. ### Claim 18 (depends on 13) The rechargeable lithium battery of claim 13, wherein the binder comprises about 50 to about 99 wt % of the first binder and about 1 to about 50 wt % of the second binder. ### Claim 19 (depends on 13) The rechargeable lithium battery of claim 13, wherein the positive active material layer further comprises a conductive material. ### Claim 20 (depends on 19) The rechargeable lithium battery of claim 19, wherein the positive active material layer comprises about 65 to about 85 wt % of the positive active material, about 5 to about 20 wt % of the binder, and about 5 to about 10 wt % of the conductive material. ### Claim 21 (depends on 13) The rechargeable lithium battery of claim 13, wherein the positive electrode has a thickness ranging from about 150 to about 2000 μm. ### Claim 22 (depends on 13) The rechargeable lithium battery of claim 13, wherein the positive electrode has a thickness ranging from about 150 to about 1000 μm. ### Claim 23 (depends on 13) The rechargeable lithium battery of claim 13, wherein the positive electrode has an average porosity of about 30 volume % or more.