| abstract |
A composite membrane for a lithium battery, a cathode for a lithium battery, and a lithium battery including the composite membrane. The composite membrane includes a copolymer including a first repeating unit represented by Formula 1 and a second repeating unit represented by Formula 2: n n n n n n n n n n wherein Ar 1 , R 1 , R 2 , R 3 , A, n n n n n n n n n n Y − , and m in Formula 1, and R 4 to R 7 , a, and n in Formula 2, are the same as defined in the specification. |