A flexible freestanding air cathode inspired by traditional Chinese calligraphy art is built. When this novel electrode is employed as both a new concept cathode and current collector, to replace conventional rigid and bulky counterparts, a highly flexible and foldable Li-O₂ battery with excellent mechanical strength and superior electrochemical performance is obtained.

http://onlinelibrary.wiley.com/doi/10.1002/adma.201503025/abstract#rd