An artificial while very stable solid electrolyte interphase film is formed on lithium metal using an electrochemical strategy. When this protected Li anode is first used in a Li-O2 battery, the film formed on the anode can effectively suppress the parasitic reactions on the Li anode/electrolyte interface and significantly enhance the cycling stability of the Li-O2 battery.
Inspired by traditional cyanotype, we first design a novel strategy for the fabrication of low-cost, lightweight, and soft patterned electrodes. When employed in flexible potassium-ion battery, the patterned electrodes show superior electrochemical performance, including good cycling stability and high energy density. This appealing photographic printing technique as well as the promising electrochemical results opens a new avenue for the fabrication of flexible energy storage systems.
To recycle rusty stainless-steel meshes (RSSM) and meet the urgent requirement of developing high-performance cathodes for potassium-ion batteries (KIB), we demonstrate a new strategy to fabricate flexible binder-free KIB electrodes via transformation of the corrosion layer of RSSM into compact stack-layers of Prussian blue (PB) nanocubes (PB@SSM). When further coated with reduced graphite oxide (RGO) to enhance electric conductivity and structural stability, the low-cost, stable, and binder-free RGO@PB@SSM cathode exhibits excellent electrochemical performances for KIB, including high capacity (96.8 mAh g ), high discharge voltage (3.3 V), high rate capability (1000 mA g ; 42 % capacity retention), and outstanding cycle stability (305 cycles; 75.1 % capacity retention).
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.
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