New Application of Waste Citrus Maxima Peel-Derived Carbon as an Oxygen Electrode Material for Lithium Oxygen Batteries
New Application of Waste Citrus Maxima Peel-Derived Carbon as an Oxygen Electrode Material for Lithium Oxygen Batteries
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DOI：
10.1021/acsami.8b07212
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发表时间：
2018-09-26
影响因子：
9.5
通讯作者：
Zhang, Cunzhong
中科院分区：
文献类型：
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作者：
Li, Danrong;Wang, Qingzhen;Zhang, Cunzhong
近年来，锂氧电池以其惊人的理论能量密度成为满足当前大容量储能设备需求的最有希望的候选者。但仍面临可逆性差、循环寿命短等问题。在此，使用柑橘皮（CMP）作为前体，通过在氮气气氛中在900 ° C下热解来制备活化的和负载Fe的碳（分别为CMPAC和CMPACs-Fe），其中添加KOH作为活化剂。电化学测试结果表明，CMPAC基Li-O-2电池具有7800 mA h/g的高比容量、466次循环稳定性、92.5%的库仑效率、良好的倍率性能和可逆性。此外，CMPACs-Fe基O-2电极在充电和放电过程中提供更低的过电位。研究结果表明，CMPAC和CMPACs-Fe基O-2电极的优异电化学性能得益于其多孔结构、丰富的活性中心和较大的比表面积（900和768 m2/g），这表明这些生物质多孔炭有望成为高效锂氧电池的候选材料。
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 degrees C, in which KOH was added as an activator. Electrochemical measurements show that CMPAC-based Li-O-2 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-2 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-2 electrode benefit from their cellular porous structure, plenty of active sites, and large specific surface area (900 and 768 m(2)/g), which suggest that these biomass-derived porous carbons might become promising candidates to achieve efficient lithium oxygen battery.