CPC H01M 4/623 (2013.01) [H01M 4/0404 (2013.01); H01M 4/0471 (2013.01); H01M 4/131 (2013.01); H01M 4/5825 (2013.01); H01M 10/052 (2013.01); H01M 2004/021 (2013.01)] | 13 Claims |
1. An electrode comprising:
a current collector; and
an electrode active material layer disposed on at least one surface of the current collector,
wherein the electrode active material layer comprises:
a lower layer region facing the current collector, and
an upper layer region facing the lower layer region and extended to a surface of the electrode active material layer,
the lower layer region comprises a first active material and a first non-rubbery binder, and is free from a rubbery binder,
the upper layer region comprises a second active material, a second non-rubbery binder, and the rubbery binder,
the rubbery binder is a hydrogenated nitrile butadiene rubber (H-NBR),
each of the first non-rubbery binder and the second non-rubbery binder comprises a polyvinylidene fluoride (PVDF)-based polymer, and
a weight ratio of the second non-rubbery binder to the rubbery binder in the upper layer region is 1:0.03 to 1:0.07.
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