Enhancing the Capacity and Stability by CoFe(2)O(4) Modified g-C(3)N(4) Composite for Lithium-Oxygen Batteries

As society progresses, the task of developing new green energy brooks no delay. Li-O(2) 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(2) batteries is of great significance to finding a solution for energy problems. Herein, we design CoFe(2)O(4)/g-C(3)N(4) composites, and combine the advantages of the g-C(3)N(4) material with the spinel-type metal oxide material. The flaky structure of g-C(3)N(4) accelerates the transportation of oxygen and lithium ions and inhibits the accumulation of CoFe(2)O(4) particles. The CoFe(2)O(4) materials accelerate the decomposition of Li(2)O(2) and reduce electrode polarization in the charge–discharge reaction. When CoFe(2)O(4)/g-C(3)N(4) composites are used as catalysts in Li-O(2) batteries, the battery has a better discharge specific capacity of 9550 mA h g(−1) (catalyst mass), and the cycle stability of the battery has been improved, which is stable for 85 cycles.