Enhancing the Capacity and Stability by CoFeO Modified g-CN Composite for Lithium-Oxygen Batteries.

As society progresses, the task of developing new green energy brooks no delay. Li-O batteries have high theoretical capacity, but are difficult to put into practical use due to problems such as high overvoltage, low charge-discharge efficiency, poor rate, and cycle performance. The development of high-efficiency catalysts to effectively solve the shortcomings of Li-O batteries is of great significance to finding a solution for energy problems. Herein, we design CoFeO/g-CN composites, and combine the advantages of the g-CN material with the spinel-type metal oxide material. The flaky structure of g-CN accelerates the transportation of oxygen and lithium ions and inhibits the accumulation of CoFeO particles. The CoFeO materials accelerate the decomposition of LiO and reduce electrode polarization in the charge-discharge reaction. When CoFeO/g-CN composites are used as catalysts in Li-O batteries, the battery has a better discharge specific capacity of 9550 mA h g (catalyst mass), and the cycle stability of the battery has been improved, which is stable for 85 cycles.