Bulk Ni3Mn-layered double hydroxides (Ni3Mn-LDHs) was exfoliated into single-layer Ni3Mn-LDHs nanosheets via liquid phase exfoliation,and then incorporated with CNT to obtain Ni3Mn-LDHs/CNT composites by self-assemble method.The structure of the composites was characterized by X-ray powder diffraction (XRD),scanning electron microscopy (SEM) and transmission electron microscopy (TEM).The electrochemical process was analyzed by galvanostatic tests,cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS).The Ni3Mn-LDHs/CNT composites improved the ORR and OER catalytic activities significantly,the obtained Ni3Mn-LDHs/CNT cathode presented nearly 300％ higher discharge capacity,excellent rate and cycling stability than the CNT cathode in lithium-oxygen batteries.%将块体镍锰层状双金属氢氧化物(Ni3Mn-LDHs)通过液相剥离法制备成单层Ni3Mn-LDHs,然后采用自组装法获得Ni3Mn-LDHs/CNT复合材料.采用X射线衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)对复合材料的结构进行分析,通过恒流充放电、循环伏安(CV)和电化学阻抗谱(EIS)研究电极的电化学过程.结果表明:Ni3Mn-LDHs/CNT复合材料可以有效提升ORR和OER的催化活性,与CNT正极相比较,Ni3Mn-LDHs/CNT正极在锂-氧电池中的放电容量提高了近300％,并且具有优异的倍率性能和循环稳定性.
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