嵌入氮掺杂氧化石墨烯中的MnO纳米八面体作为锂离子电池的高效负极材料。

MnO nano-octahedrons embedded in nitrogen-doped graphene oxide as potent anode material for lithium-ion batteries.

作者信息

Nagaraja Pernapati, Rao H Seshagiri, Pamidi Venkat, Umeshbabu Ediga, Rao G Ranga, Justin Ponniah

机构信息

Department of Chemistry and DST-Solar Energy Harnessing Centre, Indian Institute of Technology Madras, Chennai, 600036 India.

Department of Chemistry, Rajiv Gandhi University of Knowledge Technologies, RK Valley, Kadapa, Andhra Pradesh 516330 India.

出版信息

Ionics (Kiel). 2023 May 16:1-12. doi: 10.1007/s11581-023-05035-6.

DOI:10.1007/s11581-023-05035-6

PMID:37360247

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC10187504/

Abstract

UNLABELLED

MnO nano-octahedrons embedded in N-doped graphene oxide (MNGO) nanosheets were synthesized using a simple, energy-efficient, and rapid microwave-digested hydrothermal route in a single step. The structural and morphological aspects of synthesized materials were evaluated by XRD, IR, Raman, FE-SEM, and HR-TEM techniques. Then, the composite MNGO was tested for its Li-ion storage properties and compared with reduced graphene oxide (rGO) and MnO materials. The MNGO composite exhibited superior reversible specific capacity, excellent cyclic stability, and outstanding structural integrity throughout the electrochemical studies. The MNGO composite showed a reversible capacity of 898 mA h g after 100 cycles at 100 mA g and Coulombic efficiency of 97.8%. Even at a higher current density of 500 mA g, it exhibits a higher specific capacity of 532 mA h g (~1.5 times higher than commercial graphite anode). These results demonstrate that MnO nano-octahedrons embedded on N-doped GO are a highly durable and potent anode material for LIBs.

SUPPLEMENTARY INFORMATION

The online version contains supplementary material available at 10.1007/s11581-023-05035-6.

摘要

未标记

采用简单、节能且快速的微波消解水热法一步合成了嵌入氮掺杂氧化石墨烯（MNGO）纳米片中的MnO纳米八面体。通过XRD、IR、拉曼、场发射扫描电子显微镜（FE-SEM）和高分辨透射电子显微镜（HR-TEM）技术对合成材料的结构和形态进行了评估。然后，对复合MNGO的锂离子存储性能进行了测试，并与还原氧化石墨烯（rGO）和MnO材料进行了比较。在整个电化学研究中，MNGO复合材料表现出优异的可逆比容量、出色的循环稳定性和卓越的结构完整性。MNGO复合材料在100 mA g下循环100次后，可逆容量为898 mA h g，库仑效率为97.8%。即使在500 mA g的更高电流密度下，它仍表现出532 mA h g的更高比容量（比商业石墨负极高约1.5倍）。这些结果表明，嵌入氮掺杂氧化石墨烯上的MnO纳米八面体是一种用于锂离子电池的高度耐用且高效的负极材料。