以電化學沉積二氧化錳奈米片包敷之金奈米錐於碳纖維表面作為鋰-氧氣電池之陰極材料

Abstract

鋰-氧氣電池有極高之比能量密度，是近年來熱門的研究目標。由於二氧化錳具有對氧氣之催化活性、地球含量高、低成本及對環境友善等特性，近年來已被應用於鋰-氧氣電池。在本研究中，我們利用電化學沉積合成二氧化錳奈米片包敷之金奈米錐於碳纖維表面之電極。應用於鋰-氧氣電池之陰極，在 100 mA g-1 的充放電速率下能達到約 3000 mAh g-1 之電容值，並且於 500 mA g-1 的充放電速率之定 1000 mAh g-1 電容充放電的測試能維持 20 圈之充放電循環。因此，我們期望利用所合成之極片組成之鋰-氧氣電池能於未來供應電子裝置使用。

Li-O2 battery has attracted considerable attention owing to its extremely high specific energy density. To advance its performance, MnO2 has been recently employed in Li-O2 battery because of its oxygen catalytic reactivity, high abundance, low cost and environmental friendliness. In this study, electrodes were fabricated via electrochemical deposition to grow MnO2 nanosheets (NSs) on Au nanothorns (NTs) at carbon fiber (CF/Au NTs/MnO2 NSs). As a result, cathode using such step had a capacity of ~3000 mAh g-1 at a current density of 100 mA g-1, and exhibited 20 discharge/charge cycles with a capacity limitation of 1000 mAh g-1 at a current density of 500 mA g-1. Thus, we anticipate that the Li-O2 battery applied as-synthesized electrode could serve as energy storage for future electric vehicles.