Anchoring NiO Nanosheet on the Surface of CNT to Enhance the Performance of a Li-O2 Battery

Abstract

Li2O2, as the cathodic discharge product of aprotic Li-O2 batteries, is difficult to electrochemically decompose. Transition-metal oxides (TMOs) have been proven to play a critical role in promoting the formation and decomposition of Li2O2. Herein, a NiO/CNT catalyst was prepared by anchoring a NiO nanosheet on the surface of CNT. When using the NiO/CNT as a cathode catalyst, the Li-O2 battery had a lower overpotential of 1.2 V and could operate 81 cycles with a limited specific capacity of 1000 mA h g−1 at a current density of 100 mA g−1. In comparison, with CNT as a cathodic catalyst, the battery could achieve an overpotential of 1.64 V and a cycling stability of 66 cycles. The introduction of NiO effectively accelerated the generation and decomposition rate of Li2O2, further improving the battery performance. SEM and XRD characterizations confirmed that a Li2O2 film formed during the discharge process and could be fully electrochemical decomposed in the charge process. The internal network and nanoporous structure of the NiO/CNT catalyst could provide more oxygen diffusion channels and accelerate the decomposition rate of Li2O2. These merits led to the Li-O2 battery’s better performance.

Reformation of solution process NiO thin films with UV curable polymers for the self‐alignment of liquid crystals

“…The NiO thin film has a wide bandgap and excellent transmittance, which is a great advantage for display devices. [24][25][26] In this study, we mixed these inorganic materials and polymers to achieve high-quality nanopattern transfer while reducing the steps of the NIL process. The hybrid solution was coated on the ITO substrate and cured at different UV curing times.…”

“…Nickel oxide (NiO) was used as the TCO in this study. The NiO thin film has a wide bandgap and excellent transmittance, which is a great advantage for display devices 24–26 . In this study, we mixed these inorganic materials and polymers to achieve high‐quality nanopattern transfer while reducing the steps of the NIL process.…”