CPC H01M 4/587 (2013.01) [B82Y 30/00 (2013.01); B82Y 40/00 (2013.01); C25D 5/48 (2013.01); C25D 5/50 (2013.01); C25D 13/02 (2013.01); C25D 13/12 (2013.01); H01M 4/0452 (2013.01); H01M 4/0471 (2013.01); H01M 4/133 (2013.01); H01M 4/1393 (2013.01); H01M 4/66 (2013.01); H01M 4/70 (2013.01); Y02E 60/10 (2013.01); Y10T 428/24355 (2015.01)] | 18 Claims |
1. A secondary battery comprising:
a positive electrode; and
a negative electrode,
wherein the negative electrode comprises:
a negative current collector;
a negative active material layer over the negative current collector, the negative active material layer having an uneven surface; and
a plurality of graphene layers over the uneven surface,
wherein a first part of the plurality of graphene layers is in contact with the uneven surface,
wherein a space is formed between a second part of the plurality of graphene layers and a depression of the uneven surface,
wherein a number of layers of the plurality of graphene layers is 50 or less,
wherein each of the plurality of graphene layers has at least one pore, and
wherein the pore of a first layer of the plurality of graphene layers does not overlap the pore of a second layer adjacent to the first layer of the plurality of graphene layers.
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