Embedding MnO@Mn3O4 Nanoparticles in an N‐Doped‐Carbon Framework Derived from Mn‐Organic Clusters for Efficient Lithium Storage. Issue 6 (22nd December 2017)

• Record Type: Journal Article
• Authors: Chu, Yanting; Guo, Lingyu; Xi, Baojuan; Feng, Zhenyu; Wu, Fangfang; Lin, Yue; Liu, Jincheng; Sun, Di; Feng, Jinkui; Qian, Yitai; Xiong, Shenglin
• Is Part Of: Advanced materials. Volume 30:Issue 6(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2017-12-22
• Subjects: anodes -- lithium‐ion batteries -- Mn8 clusters -- MnO@Mn3O4 nanoparticles -- nitrogen‐doped porous carbon frameworks; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adma.201704244
• Languages: English
• ISSNs: 0935-9648

Abstract

Abstract: The first synthesis of MnO@Mn3 O4 nanoparticles embedded in an N‐doped porous carbon framework (MnO@Mn3 O4 /NPCF) through pyrolysis of mixed‐valent Mn8 clusters is reported. The unique features of MnO@Mn3 O4 /NPCF are derived from the distinct interfacial structure of the Mn8 clusters, implying a new methodological strategy for hybrids. The characteristics of MnO@Mn3 O4 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@Mn3 O4, the uniform distribution, and the NPCF, MnO@Mn3 O4 /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@Mn3 O4 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. Abstract : The first synthesis of MnO@Mn3 O4 nanoparticles embedded in a N‐doped porous carbon framework (MnO@Mn3 O4 /NPCF) through pyrolysis of mixed‐valent Mn8 clusters indicates unprecedented lithium‐storage performance. The as‐synthesized MnO@Mn3 O4 composition is first identified by a combination of atomic‐resolution HAADF‐STEM and EELS valence‐state analyses. This work presents a new methodology to construct composites for energy storage and conversion.