Beijing Key Laboratory of Environmental Science and Engineering, School of Materials Science & Engineering , Beijing Institute of Technology , Beijing 100081 , China.
ACS Appl Mater Interfaces. 2018 Sep 26;10(38):32058-32066. doi: 10.1021/acsami.8b07212. Epub 2018 Sep 14.
Recently, lithium oxygen battery has become a promising candidate to satisfy the current large-energy-storage devices demand because of its amazing theoretical energy density. However, it still faces problems such as poor reversibility and short cycle life. Here, citrus maxima peel (CMP) was used as a precursor to prepare activated and Fe-loading carbon (CMPACs and CMPACs-Fe, respectively) via pyrolysis in nitrogen atmosphere at 900 °C, in which KOH was added as an activator. Electrochemical measurements show that CMPAC-based Li-O battery possesses high specific capacity of 7800 mA h/g, steady cycling performance of 466 cycles with a corresponding Coulombic efficiency of 92.5%, good rate capability, and reversibility. Besides, CMPACs-Fe-based O electrode delivers even lower overpotential in both charge and discharge processes. We conclude that these excellent electrochemical performances of CMPACs and CMPACs-Fe-based O electrode benefit from their cellular porous structure, plenty of active sites, and large specific surface area (900 and 768 m/g), which suggest that these biomass-derived porous carbons might become promising candidates to achieve efficient lithium oxygen battery.
最近，由于其惊人的理论能量密度，锂氧电池已成为满足当前大型储能设备需求的有前途的候选者。然而，它仍然面临着可逆性差和循环寿命短等问题。在这里，我们使用柑橘皮（CMP）作为前驱体，通过在氮气气氛中于 900°C 下进行热解，分别用 KOH 作为活化剂制备了活化和负载铁的碳（CMPAC 和 CMPACs-Fe）。电化学测量表明，基于 CMPAC 的 Li-O 电池具有 7800 mA h/g 的高比容量、466 次循环的稳定循环性能，相应的库仑效率为 92.5%、良好的倍率性能和可逆性。此外，CMPACs-Fe 基 O 电极在充电和放电过程中的过电位甚至更低。我们得出结论，这些优异的电化学性能归因于 CMPACs 和 CMPACs-Fe 基 O 电极的多孔蜂窝结构、丰富的活性位点和大的比表面积（900 和 768 m/g），这表明这些生物质衍生的多孔碳可能成为实现高效锂氧电池的有前途的候选材料。
