2 research outputs found
Binary Mixtures of Highly Concentrated Tetraglyme and Hydrofluoroether as a Stable and Nonflammable Electrolyte for Li–O<sub>2</sub> Batteries
Developing a long-term
stable electrolyte is one of the most enormous
challenges for Li–O<sub>2</sub> batteries. Equally, the high
flammability of frequently used solvents seriously weakens the electrolyte
safety in Li–O<sub>2</sub> batteries, which inevitably restricts
their commercial applications. Here, a binary mixture of highly concentrated
tetraglyme electrolyte (HCG4) and 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl
ether (TTE) was used for a novel electrolyte (HCG4/TTE) in Li–O<sub>2</sub> batteries, which exhibit good wettability, enhanced ionic
conductivity, considerable nonflammability, and high electrochemical
stability. Being a co-solvent, TTE can contribute to increasing ionic
conductivity and to improving flame retardance of the as-prepared
electrolyte. The cell with this novel electrolyte displays an enhanced
cycling stability, resulting from the high electrochemical stability
during cycling and the formation of electrochemically stable interfaces
prevents parasitic reactions occurring on the Li anode. These results
presented here demonstrate a novel electrolyte with a high electrochemical
stability and considerable safety for Li–O<sub>2</sub> batteries
Multiporous MnCo<sub>2</sub>O<sub>4</sub> Microspheres as an Efficient Bifunctional Catalyst for Nonaqueous Li–O<sub>2</sub> Batteries
Multiporous
MnCo<sub>2</sub>O<sub>4</sub> microspheres are fabricated via the
solvothermal method followed by pyrolysis of carbonate precursor to
demonstrate excellent bifunctional catalytic activity toward both
the oxygen reduction reaction (ORR) and oxygen evolution reaction
(OER). Because of this multiporous structure, the resulting MnCo<sub>2</sub>O<sub>4</sub> microspheres show an efficient electrocatalytic
performance in LiTFSI/TEGDME electrolyte-based Li–O<sub>2</sub> batteries. MnCo<sub>2</sub>O<sub>4</sub> microspheres as the air
cathode deliver better performance during the discharging and charging
processes and good cycle stability compared with that of the Super
P. This preliminary result manifests that multiporous MnCo<sub>2</sub>O<sub>4</sub> microspheres are promising cathode catalysts for nonaqueous
Li–O<sub>2</sub> batteries