2D Co-doped MnCr₂O₄ nanosheets as efficient bifunctional cathode materials for long-life Li–O₂ batteries

Abstract

Lithium-oxygen batteries (LOBs) with ultra-high theoretical energy density have not been commercialized due to those shortcomings such as short cyclic lifespan, high charging overpotential and poor rate capability. Here, we...

Modulation Strategies and Activity Descriptors of Spinel Electrocatalysts for Lithium−Oxygen Batteries

“…Co-doped MnCr 2 O 4 (MnCoCrO) with a layered structure was successfully prepared using a combination of sol-gel and annealing methods. [95] As shown in the Figure 3j-3 m, Co doping allows the adsorption capacity of the active site on the oxygen-containing intermediate LiO 2 to be significantly improved, so that the subsequent discharge product Li 2 O 2 nucleates and grows on the catalyst surface by surface adsorption mechanism, which avoids the dissolution of Li 2 O 2 into the electrolyte, and effectively inhibits the parasitic reaction caused by the nucleophilic attack of LiO 2 . The microscopic morphology of MnCoCrO and MnCrO electrode discharge products was further observed by non-in situ scanning electron microscopy in Figure 3n-3q.…”

“…Copyright 2023, American Chemical Society. (j-q) Reproduced with permission [95]. Copyright 2023, Royal Society of Chemistry.…”

In Situ Construction of NiS-MoS2 Nanoheterostructure with Interfacial Electron Redistribution for Li-Oxygen Batteries

“…Considerable effort has been dedicated to the development of non-noble metal electrocatalysts for Li–O 2 batteries in recent years, such as transition metal sulfides/oxides, ,− nitrides, , carbon-based materials, , and so on. − Among them, transition metal disulfides (TMDs), due to their low cost, high chemical activity, and structural diversity, have sparked tremendous attention. , NiS is recognized for its high theoretical specific capacitance, robust reversible redox activity, and low toxicity. It exhibits weaker Ni–S bonding and lower electronegativity, facilitating the easier conversion of redox reactions. − However, the electrocatalytic activity and stability still need to be further improved.…”

“…The energy and environmental challenges stemming from the rapid depletion of fossil resources has stimulated the continuous exploration of renewable and new energy technologies. − Li–O 2 batteries have garnered significant attention due to their considerable advantage in terms of high theoretical energy density, indicating substantial potential for addressing daily power supply needs. , Li–O 2 batteries is associated with the reversible lithium peroxide formation and decomposition concerning the oxygen reduction/evolution reaction process (ORR/OER). − Nevertheless, Li–O 2 batteries still face challenges such as poor magnification ability, insufficient reversible capacity, elevated charge and discharge overpotential, limited cycle life, and the generation of numerous reaction byproducts. − These issues seriously restricted the practical development of Li–O 2 batteries. , The main way to address these issues is to develop high-efficiency catalysts for the air cathode. In recent years, precious metals and their alloys have demonstrated outstanding electrocatalytic activity against oxygen reduction/evolution reaction, yet their high cost and scarcity have severely limited their commercial application. − …”