Flexible and Foldable Li–O₂ Battery Based on Paper‐Ink Cathode

Abstract

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.

Electrocatalytic performances of g-C3N4-LaNiO3 composite as bi-functional catalysts for lithium-oxygen batteries

“…A lithium foil was used as the anode, 1 M LiCF 3 SO 3 in tetraethylene glycol dimethyl ether (TEGDME) as the electrolyte, glass fiber filter paper as separator, carbon-paper-supported catalysts as the cathode electrode and two piece of nickel foam (1 mm thick) as the cathode current collector4344. The oxygen electrodes were prepared by mixing the as-prepared CNL catalysts, XC-72 carbon, 5 wt.% polyvinylidene fluoride (PVDF) and solvent N-methyl-2-pyrrolidone (NMP), and the mass ratio of CNL catalyst: XC-72 carbon: 5 wt.% PVDF is 1:2:3.…”

Paper‐Based Electrodes for Flexible Energy Storage Devices

“…19 This flexible low‐cost paper‐ink (PI) cathode can be directly applied in Li‐O 2 batteries by combining with lithium belt anode, glass fiber separator and non‐aqueous electrolyte (1M lithium triflate in tretraethylene glycol dimethyl ether). The Li‐O 2 battery showed a high capacity of about 6500 mAh g −1 at a current density of 200 mA g −1 and reached about 50 cycles with the capacity restricted to 1000 mAh g −1 at a current density of 200 mA g −1 .…”

“…Such a “rate‐limiting step” has greatly impeded the commercialization of these electronics. In order to overcome this limiting factor, extensive efforts have been devoted to make flexible and high performance energy storage devices 12, 13, 14, 15, 16, 17, 18, 19…”

Recent Advances in Nanowire‐Based, Flexible, Freestanding Electrodes for Energy Storage

“…Commonly used methods to grow NW materials on conductive substrates include hydrothermal/solvothermal reactions, chemical vapor deposition (CVD),v apor-liquid-solid (VLS) growth, electrodeposition, and physical evaporation deposition. [22] However, because they are nonconductive, these substrates are usually carbonized first or predeposited with ac onductive layer and then the NW active materials are allowedt og row.A nother effective and low-cost approach is through depositing conductive inks of active material-carbon composites by printing or painting [23] on nonconductive flexible substrates. [19] To date, many flexible conductive substrates, such as CC, graphene paper,T if oil, CNT paper, and Ni foam, have been used to grow NWs, which are most commonly aligned vertically on the substrates.…”