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Layered double hydroxide (LDH)-based catalysts have emerged as one of the most promising catalysts due to their unique layered structure, compositional flexibility, low cost, and easy synthesis. Herein, NiMn-LDH was in situ incorporated with carbon black (CB) via a facile hydrothermal method, and the morphology of the LDHs tended to be small-sized flaky-like from large bulk flower-like with the increasing amount of CB. The fabricated 50CB/NiMn-LDH cathode tended to induce the poorly crystalline film–like Li2O2 to form, indicating the significant effect of NiMn-LDH flake on the surface redox reaction. The lithium-oxygen (Li-O2) battery with 50CB/NiMn-LDH cathode exhibited improved capacity output (5684 vs 2682 mAh g−1), low overpotential (1.49 vs 1.62 V), and stable cyclability (35th vs 15th). The present synthetic strategy is very simple and low cost and can be easily extended to other LDH-based materials with significant effect.

Hybrids of layered double hydroxides (LDHs) and graphene-based nanocomposites have invoked a great deal of interest due to the unique and highly tunable composition and properties. Herein, CoAl-LDHs nanosheets were in-situ incorporated with reduced graphene oxide (rGO) via a simple one-step reflux method to improve the electrochemical performance of lithium-oxygen (Li−O2) battery. The obtained nanocomposites tended to decrease the particle size of CoAl-LDHs nanosheets and endowed more catalytic active sites. Benefiting from the synergistic effect, the fabricated rGO/CoAl-LDHs nanocomposites enhanced the charge transfer process and the first discharge specific capacity up to 300% higher than the pristine rGO under the same condition. In addition, the battery showed excellent cycling stability with no capacity loss over 30 cycles, as well as markedly lower recharge voltage. The results provide a facile way to prepare two-dimensional cathode material for Li−O2 battery.