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Embedding MnO@Mn 3 O 4 Nanoparticles in an N‐Doped‐Carbon Framework Derived from Mn‐Organic Clusters for Efficient Lithium Storage
Author(s) -
Chu Yanting,
Guo Lingyu,
Xi Baojuan,
Feng Zhenyu,
Wu Fangfang,
Lin Yue,
Liu Jincheng,
Sun Di,
Feng Jinkui,
Qian Yitai,
Xiong Shenglin
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201704244
Subject(s) - materials science , scanning transmission electron microscopy , nanoparticle , valence (chemistry) , lithium (medication) , transmission electron microscopy , electron energy loss spectroscopy , chemical engineering , nanotechnology , chemistry , medicine , organic chemistry , endocrinology , engineering
The first synthesis of MnO@Mn 3 O 4 nanoparticles embedded in an N‐doped porous carbon framework (MnO@Mn 3 O 4 /NPCF) through pyrolysis of mixed‐valent Mn 8 clusters is reported. The unique features of MnO@Mn 3 O 4 /NPCF are derived from the distinct interfacial structure of the Mn 8 clusters, implying a new methodological strategy for hybrids. The characteristics of MnO@Mn 3 O 4 are determined by conducting high angle annular dark‐field scanning transmission electron microscopy (HAADF‐STEM) and electron energy loss spectroscopy (EELS) valence‐state analyses. Due to the combined advantages of MnO@Mn 3 O 4 , the uniform distribution, and the NPCF, MnO@Mn 3 O 4 /NPCF displays unprecedented lithium‐storage performance (1500 mA h g −1 at 0.2 A g −1 over 270 cycles). Quantitative analysis reveals that capacitance and diffusion mechanisms account for Li + storage, wherein the former dominates. First‐principles calculations highlight the strong affiliation of MnO@Mn 3 O 4 and the NPCF, which favor structural stability. Meanwhile, defects of the NPCF decrease the diffusion energy barrier, thus enhancing the Li + pseudocapacitive process, reversible capacity, and long cycling performance. This work presents a new methodology to construct composites for energy storage and conversion.