# US 9,882,239 B2 · Composition for gel polymer electrolyte and lithium secondary 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 9,882,239 B2 - Document ID: US9882239B2 - Status: Granted - Kind: B2 - Application number: 14/248,448 - Filed: 2014-04-09 - Published: 2014-08-07 - Granted: 2018-01-30 - Earliest claimed: 2013-01-28 - Assignees: LG Chem, Ltd. - Applicants: LG Chem, Ltd. - Inventors: Sung Hoon Yu; Doo Kyung Yang; Sun Sik Shin; Song Taek Oh; Yoo Sun Kang; Kyung Mi Lee; Jin Hyun Park; Jung Don Suk - Web page: https://patentgrep.com/patent/US9882239B2 ## CPC - H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type - C08L 33/18: Homopolymers or copolymers of nitriles - H01M 10/052: Li-accumulators - H01M 4/505: of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy - H01M 4/525: of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy - H01M 2300/0085: Immobilising or gelification of electrolyte - Y02E 60/10: Energy storage using batteries - H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION ## Abstract Provided are a composition for a gel polymer electrolyte including i) an electrolyte solution solvent, ii) an ionizable lithium salt, iii) a polymerization initiator, and iv) a monomer having a functional group bondable to metal ions, and a lithium secondary battery including the composition for a gel polymer electrolyte. In a case where the composition for a gel polymer electrolyte of the present invention is used in a lithium secondary battery, since the movement of metal ions dissolved from a cathode to an anode may be prevented or the precipitation of metal on the anode may be reduced, the lifetime of the battery may not only be improved but capacity characteristics of the battery may also be excellent even in the case in which the battery is charged at a high voltage as well as normal voltage. ## Claims ### Claim 1 A composition for a gel polymer electrolyte for a lithium secondary battery, the composition comprising: i) an electrolyte solution solvent; ii) an ionizable lithium salt; iii) a polymerization initiator; and iv) a monomer having a functional group bondable to metal ions, wherein the monomer is an acrylate-based monomer having the functional group selected from the group consisting of which are substituted or unsubstituted with C1-C5 alkyl or halogen, and a mixture of two or more thereof. ### Claim 2 (depends on 1) The composition for a gel polymer electrolyte of claim 1, wherein the acrylate-based monomer having the functional group is any one selected from the group consisting of the following compounds and a mixture of two or more thereof: (1) ethyl (E)-3-(pyridin-2-yl)-acrylate; (2) ethyl (E)-3-(4-pyridinyl)-2-propenoate; (3) 2-propenoic acid, 3,3′-[2,2′-bipyridine]-4,4′-diylbis-, dimethyl ester; (4) 2-propenoic acid, 2-[2,2′-bipyridine]-6-ylethyl ester; (5) 2-propenoic acid, 2-[2,2′-bipyridine]-5-ylethyl ester; (6) 2-propenoic acid, 2-[2,2′-bipyridine]-4-ylethyl ester; (7) 2-propenoic acid, 1,1′-[[2,2′-bipyridine]-4,4′-diylbis(methylene)] ester; (8) 2-propenoic acid, 1,10-phenanthroline-2,9-diylbis(methylene) ester; (9) 2-propenoic acid, 3-(1,10-phenanthroline-2-yl)-phenylmethyl ester; and (10) 2-propenoic acid, 2-[[(1-oxo-2-propenyl)oxy]methyl]-2-[(1,10-phenanthroline-5-ylmethoxy)methyl]-1,3-propanediyl ester. ### Claim 3 (depends on 1) The composition for a gel polymer electrolyte of claim 1, further comprising a monomer having 2 to 6 acrylate groups, wherein the monomer is a branched monomer. ### Claim 4 (depends on 3) The composition for a gel polymer electrolyte of claim 3, wherein the branched monomer is any one selected from the group consisting of ditrimethylolpropane tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and a mixture of two or more thereof. ### Claim 5 (depends on 1) The composition for a gel polymer electrolyte of claim 1, wherein the monomer having the functional group is included in an amount of 0.1 wt % to 10 wt % based on a total weight of the composition. ### Claim 6 (depends on 3) The composition for a gel polymer electrolyte of claim 3, wherein the branched monomer is included in an amount of 0.1 wt % to 10 wt % based on the total weight of the composition. ### Claim 7 (depends on 3) The composition for a gel polymer electrolyte of claim 3, wherein a content ratio(weight ratio) of the monomer having the functional group to the branched monomer is in a range of 1:0.1 to 1:10. ### Claim 8 (depends on 1) The composition for a gel polymer electrolyte of claim 1, wherein the lithium salt is any one selected from the group consisting of LiPF6, LiBF4, LiSbF6, LiAsF6, LiClO4, LiN(C2F5SO2)2, LiN(CF3SO2)2, CF3SO3Li, LiC(CF3SO2)3, LiC4BO8, and a mixture of two or more thereof. ### Claim 9 (depends on 1) The composition for a gel polymer electrolyte of claim 1, wherein the electrolyte solution solvent is linear carbonate, cyclic carbonate, or a combination thereof. ### Claim 10 (depends on 9) The composition for a gel polymer electrolyte of claim 9, wherein the linear carbonate comprises any one selected from the group consisting of dimethyl carbonate, diethyl carbonate, dipropyl carbonate, ethylmethyl carbonate, methylpropyl carbonate, and ethylpropyl carbonate, and a mixture of two or more thereof, and the cyclic carbonate comprises any one selected from the group consisting of ethylene carbonate, propylene carbonate, 1,2-butylene carbonate, 2,3-butylene carbonate, 1,2-pentylene carbonate, 2,3-pentylene carbonate, vinylene carbonate, a halide thereof, and a mixture of two or more thereof. ### Claim 11 (depends on 1) A lithium secondary battery comprising: a cathode; an anode; a separator; and a gel polymer electrolyte, wherein the gel polymer electrolyte is formed by polymerizing the composition for a gel polymer electrolyte of claim 1. ### Claim 12 (depends on 11) The lithium secondary battery of claim 11, wherein the composition for a gel polymer electrolyte further comprises a monomer having 2 to 6 acrylate groups, wherein the monomer is a branched monomer. ### Claim 13 (depends on 12) The lithium secondary battery of claim 12, wherein the branched monomer is any one selected from the group consisting of ditrimethylolpropane tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, and a mixture of two or more thereof. ### Claim 14 (depends on 11) The lithium secondary battery of claim 11, wherein a charge voltage of the lithium secondary battery is in a range of 3.0 V to 5.0 V. ### Claim 15 (depends on 14) The lithium secondary battery of claim 14, wherein the charge voltage of the lithium secondary battery is in a range of 4.3 V to 5.0 V. ### Claim 16 (depends on 15) The lithium secondary battery of claim 15, wherein a cathode active material for the cathode is any one selected from the group consisting of compounds of Chemical Formulas 1 to 3, and a mixture of two or more thereof: Li[LixNiaCobMnc]O2 (where 0 (where M is one or more elements selected from the group consisting of nickel (Ni), cobalt (Co), iron (Fe), phosphorus (P), sulfur (S), zirconium (Zr), titanium (Ti), and aluminum (Al), and 0 (where M is one or more elements selected from the group consisting of Al, magnesium (Mg), Ni, Co, manganese (Mn), Ti, gallium (Ga), copper (Cu), vanadium (V), niobium (Nb), Zr, cerium (Ce), indium (In), zinc (Zn), and yttrium (Y), X is one or more elements selected from the group consisting of oxygen (O), fluorine (F), and nitrogen (N), A is P, S, or a mixed element thereof, 0≦a≦0.2, and 0.5≦x≦1). ### Claim 17 (depends on 14) The lithium secondary battery of claim 14, wherein a cathode active material for the cathode is any one selected from the group consisting of LiCoO2, LiNiO2, LiMnO2, LiMn2O4, LiNi1−yCoyO2 (0≦y<1), LiCo1−yMnyO2 (0≦y<1), LiNi1−yMnyO2 (0≦y<1), Li(NiaCobMnc)O2 (0