Positive electrode
AssigneeUmicore AG & Co. KG
InventorsShinichi Kumakura, Jihoon Kang
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Abstract
A positive electrode for lithium-ion secondary batteries, comprising a positive electrode active material and at least one polymer electrolyte being polyether polymer, said positive electrode active material comprising at least elements selected from Li, M′, and oxygen, wherein the metal M′ has a formula: Ni1-x-y-zMnxCoyAz with 0.00≤x≤0.70, 0.00≤y≤0.40, and 0.00≤z≤0.10, wherein A, when present, is different than Ni, Mn, Co and Li, and is preferably at least one of: B, Mg, Al, Nb, Ti, Y, W, S, Ba, Sr, and Zr.
Claims17
A positive electrode for lithium-ion secondary batteries, comprising a positive electrode active material and at least one polymer electrolyte, said positive electrode active material comprising Ni, Mn, Co and A, said positive electrode material having a Ni:(Mn+Co+A) molar ratio of (1-x-y-z):(x+y+z) wherein 0.00≤x≤0.70, 0.00≤y≤0.40, and 0.00≤z≤0.10 as measured by ICP, wherein A, when present, is different than Ni, Mn, Co and Li, and is at least one of:
- B, Mg, Al, Nb, Ti, Y, W, S, Ba, Sr, and Zr, and said polymer electrolyte being obtained by reaction between:
- i. at least one polyether polymer [hereinafter polymer (P)], said polymer (P) comprising:
- at least 70.0% by moles of oxyethylene units (EO);
- from 0.0 to 10.0% by moles of oxypropylene units (PO);
- and
- from 1.00 to 4.0% by moles of recurring units derived from at least one monomer [hereafter, monomer (M)] of general formula (I) or of general formula (II):
- wherein
- each of R1 and R2, equal to or different from each other and at each occurrence, is C1-6 alkanediyl wherein said C1-6 alkanediyl, is optionally substituted with one or more substituents selected from halide, C1-4 alkyl, C3-6 cycloalkyl, CF3, OR8, and wherein each of R8, equal to or different from each other and at each occurrence, is independently selected from the group consisting of hydrogen and C1-4 alkyl;
- n is an integer 0 or 1 or 2;
- each of X is a leaving group selected from the group consisting of halide, trifluoromethanesulfonate, nonafluorobutanesulfonate, p-toluenesulfonate and methanesulfonate;
- and
- ii. at least one polysiloxane compound having the formula (III):
- wherein
- each of R3, R4, R5, R6 and R7, equal to or different from each other and at each occurrence, is independently selected from the group consisting of C1-6 alkyl, C3-6 cycloalkyl, aryl, C1-6 alkoxy, heterocyclyl, wherein said C1-6 alkyl, C3-6 cycloalkyl, aryl, C1-6 alkoxy, and heterocyclyl are optionally substituted with one or more substituents selected from halide, C1-4 alkyl, C3-6 cycloalkyl, CF3, and OR8, and wherein each of R9, equal to or different from each other and at each occurrence, is independently selected from the group consisting of hydrogen, C1-4 alkyl, and an hydroxyl protecting group,
- m is an integer of at least 3;
- and
- wherein said at least one polysiloxane compound having the formula (III) is grafted to said at least one polymer (P) through reaction of at least a fraction of the —CH—CH2 moiety of monomer (M) with the H—Si moiety of the polysiloxane compound having the formula (III).
A battery or an electrochemical cell comprising a positive electrode active material and a polymer electrolyte, said positive electrode active material comprising Ni, Mn, Co and A, said positive electrode material having a Ni:(Mn+Co+A) molar ratio of (1-x-y-z):(x+y+z) wherein 0.00≤x≤0.70, 0.00≤y≤0.40, and 0.00≤z≤0.10 as measured by ICP, wherein A, when present, is different than Ni, Mn, Co and Li, and is at least one of:
- B, Mg, Al, Nb, Ti, Y, W, S, Ba, Sr, and Zr, and said polymer electrolyte being obtained by reaction between:
- i. at least one polyether polymer [hereinafter polymer (P)], said polymer (P) comprising:
- at least 70.0% by moles of oxyethylene units (EO);
- from 0.0 to 10.0% by moles of oxypropylene units (PO);
- and
- from 1.00 to 4.0% by moles of recurring units derived from at least one monomer [hereafter, monomer (M)] of general formula (I) or of general formula (II):
- wherein
- each of R1 and R2, equal to or different from each other and at each occurrence, is C1-6 alkanediyl wherein said C1-6 alkanediyl, is optionally substituted with one or more substituents selected from halide, C1-4 alkyl, C3-6 cycloalkyl, CF3, and OR8, and wherein each of R8, equal to or different from each other and at each occurrence, is independently selected from the group consisting of hydrogen and C1-4 alkyl;
- n is an integer 0 or 1 or 2;
- each of X is a leaving group selected from the group consisting of halide, trifluoromethanesulfonate, nonafluorobutanesulfonate, p-toluenesulfonate and methanesulfonate;
- and
- ii. at least one polysiloxane compound having the formula (III):
- wherein
- each of R3, R4, R5, R6 and R7, equal to or different from each other and at each occurrence, is independently selected from the group consisting of C1-6 alkyl, C3-6 cycloalkyl, aryl, C1-6 alkoxy, and heterocyclyl, wherein said C1-6 alkyl, C3-6 cycloalkyl, aryl, C1-6 alkoxy, heterocyclyl are optionally substituted with one or more substituents selected from halide, C1-4 alkyl, C3-6 cycloalkyl, CF3, and OR9, and wherein each of R9, equal to or different from each other and at each occurrence, is independently selected from the group consisting of hydrogen, C1-4 alkyl, and a hydroxyl protecting group,
- m is an integer of at least 3;
- and
- wherein said at least one polysiloxane compound having the formula (III) is grafted to said at least one polymer (P) through reaction of at least a fraction of the —CH═CH2 moiety of monomer (M) with the H—Si moiety of the polysiloxane compound having the formula (III).
Dependencies are inferred from the claim text.