Binder for rechargeable lithium battery, electrode for rechargeable lithium battery including binder, method of preparing electrode for rechargeable lithium battery, and rechargeable lithium battery including electrode

An electrode for a rechargeable lithium battery, the electrode comprising:

• a current collector, and
• an electrode composition disposed on one side or both sides of the current collector, the electrode composition including an active material and a binder, wherein:
• the binder includes a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-2, and a repeating unit represented by Chemical Formula Z, and lithium ions,
• a weight average molecular weight of the copolymer is about 10,000 to about 500,000,
• a mole ratio of the repeating unit represented by Chemical Formula X is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Y-2 is about 5% to about 35%, and a mole ratio of the repeating unit represented by Chemical Formula Z is about 30% to about 90%:
• wherein,
• R1 to R4 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• L is a substituted or unsubstituted C2 to C10 alkenylene group, and
• n is 0 or 1,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group,
• wherein,
• R11 is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R12 and R13 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group, or R12 and R13 are linked to each other to form a ring.

A method of manufacturing the electrode for a rechargeable lithium battery, the method comprising:

• mixing an active material, a solvent, and a binder to prepare an electrode composition,
• coating the electrode composition on a current collector, and
• heat-treating the current collector coated with the electrode composition, wherein:
• the binder before heat-treating includes a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-1, and a repeating unit represented by Chemical Formula Z, and lithium ions,
• the binder after heat-treating includes a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-2, and a repeating unit represented by Chemical Formula Z, and lithium ions,
• a weight average molecular weight of the copolymer is about 10,000 to about 500,000, and
• a mole ratio of the repeating unit represented by Chemical Formula X is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Y-2 is about 5% to about 35%, and a mole ratio of the repeating unit represented by Chemical Formula Z is about 30% to about 90%,
• wherein, in the above Chemical Formula X,
• R1 to R4 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• L is a substituted or unsubstituted C2 to C10 alkenylene group, and
• n is 0 or 1,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group,
• wherein,
• R11 is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R12 and R13 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group, or R12 and R13 are linked to each other to form a ring.

A binder for a rechargeable lithium battery, the binder comprising:

• a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-1, a repeating unit represented by Chemical Formula Z, and a repeating unit having a fluoro substituent, wherein:
• the repeating unit having a fluoro substituent is a repeating unit represented by one of Chemical Formulae T-1 to T-5,
• a weight average molecular weight of the copolymer is about 10,000 to about 500,000,
• a mole ratio of the repeating unit represented by Chemical Formula X is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Y-1 is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Z is about 20% to about 89.5%, and a mole ratio of the repeating unit having a fluoro substituent is about 0.5% to about 10%,
• wherein,
• R1 to R4 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• L is a substituted or unsubstituted C2 to C10 alkenylene group, and
• n is 0 or 1,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group,
• wherein,
• R11 is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R12 and R13 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group, or R12 and R13 are linked to each other to form a ring,
• wherein, R41, R43, R45, R47, and R50 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group,
• R42, R44, and R46 are each independently a fluoro group, a fluoro-substituted C1 to C30 alkyl group, a fluoro-substituted C2 to C20 alkenyl group, a fluoro-substituted C2 to C20 alkynyl group, a fluoro-substituted C3 to C8 cycloalkyl group, a fluoro-substituted C6 to C30 aryl group, a fluoro-substituted C1 to C30 heteroaryl group, a fluoro-substituted silane group, a fluoro-substituted C1 to C20 alkylsilane group, a fluoro-substituted C1 to C20 alkoxysilane group, or a fluoro-substituted C1 to C20 alkylamine group,
• at least one of R48 and R49 and at least one of R51 and R52 are a fluoro group, a fluoro-substituted C1 to C30 alkyl group, a fluoro-substituted C2 to C20 alkenyl group, a fluoro-substituted C2 to C20 alkynyl group, a fluoro-substituted C3 to C8 cycloalkyl group, a fluoro-substituted C6 to C30 aryl group, a fluoro-substituted C1 to C30 heteroaryl group, a fluoro-substituted silane group, a fluoro-substituted C1 to C20 alkylsilane group, a fluoro-substituted C1 to C20 alkoxysilane group, or a fluoro-substituted C2 to C20 carbonyl group, or
• R48 and R49 are linked to each other to form a ring, and R51 and R52 are linked to each other to form a ring.

An electrode for a rechargeable lithium battery, comprising:

• a current collector, and
• an electrode composition disposed on one side or both sides of the current collector, the electrode composition including an active material and a binder, wherein:
• the binder includes a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-2, a repeating unit represented by Chemical Formula Z, and a repeating unit having a fluoro substituent,
• the repeating unit having a fluoro substituent is a repeating unit represented by one of Chemical Formulae T-1 to T-5,
• a weight average molecular weight of the copolymer is about 10,000 to about 500,000, and
• a mole ratio of the repeating unit represented by Chemical Formula X is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Y-2 is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Z is about 20% to about 89.5%, and a mole ratio of the repeating unit having a fluoro substituent is 0.5% to about 10%,
• wherein,
• R1 to R4 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• L is a substituted or unsubstituted C2 to C10 alkenylene group, and
• n is 0 or 1,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group,
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group, and
• a mole ratio of Chemical Formula X:Chemical Formula Y-2 is about 90:10 to about 10:90,
• wherein,
• R11 is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R12 and R13 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group, or R12 and R13 are linked to each other to form a ring,
• wherein,
• R41, R43, R45, R47, and R50 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group,
• R42, R44, and R46 are each independently a fluoro group, a fluoro-substituted C1 to C30 alkyl group, a fluoro-substituted C2 to C20 alkenyl group, a fluoro-substituted C2 to C20 alkynyl group, a fluoro-substituted C3 to C8 cycloalkyl group, a fluoro-substituted C6 to C30 aryl group, a fluoro-substituted C1 to C30 heteroaryl group, a fluoro-substituted silane group, a fluoro-substituted C1 to C20 alkylsilane group, a fluoro-substituted C1 to C20 alkoxysilane group, or a fluoro-substituted C1 to C20 alkylamine group,
• at least one of R48 and R49 and at least one of R51 and R52 are a fluoro group, a fluoro-substituted C1 to C30 alkyl group, a fluoro-substituted C2 to C20 alkenyl group, a fluoro-substituted C2 to C20 alkynyl group, a fluoro-substituted C3 to C8 cycloalkyl group, a fluoro-substituted C6 to C30 aryl group, a fluoro-substituted C1 to C30 heteroaryl group, a fluoro-substituted silane group, a fluoro-substituted C1 to C20 alkylsilane group, a fluoro-substituted C1 to C20 alkoxysilane group, or a fluoro-substituted C2 to C20 carbonyl group, or
• R48 and R49 are linked to each other to form a ring, and R51 and R52 are linked to each other to form a ring.

A method of manufacturing an electrode for a rechargeable lithium battery, the method comprising:

• mixing an active material, a solvent, and a binder to prepare an electrode composition,
• coating the electrode composition on a current collector, and
• heat-treating the current collector coated with the electrode composition, wherein:
• the binder before heat-treating includes a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-1, and a repeating unit represented by Chemical Formula Z, and lithium ions,
• the binder after heat-treating includes a copolymer including a repeating unit represented by Chemical Formula X, a repeating unit represented by Chemical Formula Y-2, a repeating unit represented by Chemical Formula Z, and a repeating unit having a fluoro substituent,
• a weight average molecular weight of the copolymer is about 10,000 to about 500,000,
• a mole ratio of the repeating unit represented by Chemical Formula X is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Y-2 is about 5% to about 35%, a mole ratio of the repeating unit represented by Chemical Formula Z is about 20% to about 89.5%, and a mole ratio of the repeating unit having a fluoro substituent is 0.5% to about 10%,
• wherein,
• R1 to R4 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, or a substituted or unsubstituted C6 to C30 aryl group,
• L is a substituted or unsubstituted C2 to C10 alkenylene group, and
• n is 0 or 1,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group,
• wherein,
• R5 and R6 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group, and
• R7 is a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group,
• wherein,
• R11 is hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group,
• R12 and R13 are each independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C2 to C10 alkenyl group, a substituted or unsubstituted C2 to C10 alkynyl group, a substituted or unsubstituted C1 to C10 alkoxy group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a substituted or unsubstituted C1 to C30 heteroaryl group, or R12 and R13 are linked to each other to form a ring,
• wherein,
• R41, R43, R45, R47, and R50 are each independently hydrogen, or a substituted or unsubstituted C1 to C30 alkyl group,
• R42, R44, and R46 are each independently a fluoro group, a fluoro-substituted C1 to C30 alkyl group, a fluoro-substituted C2 to C20 alkenyl group, a fluoro-substituted C2 to C20 alkynyl group, a fluoro-substituted C3 to C8 cycloalkyl group, a fluoro-substituted C6 to C30 aryl group, a fluoro-substituted C1 to C30 heteroaryl group, a fluoro-substituted silane group, a fluoro-substituted C1 to C20 alkylsilane group, a fluoro-substituted C1 to C20 alkoxysilane group, or a fluoro-substituted C1 to C20 alkylamine group,
• at least one of R48 and R49 and at least one of R51 and R52 are a fluoro group, a fluoro-substituted C1 to C30 alkyl group, a fluoro-substituted C2 to C20 alkenyl group, a fluoro-substituted C2 to C20 alkynyl group, a fluoro-substituted C3 to C8 cycloalkyl group, a fluoro-substituted C6 to C30 aryl group, a fluoro-substituted C1 to C30 heteroaryl group, a fluoro-substituted silane group, a fluoro-substituted C1 to C20 alkylsilane group, a fluoro-substituted C1 to C20 alkoxysilane group, or a fluoro-substituted C2 to C20 carbonyl group, or
• R48 and R49 are linked to each other to form a ring, and R51 and R52 are linked to each other to form a ring.