ZnO/ZnFe2O4/N-doped C micro-polyhedrons with hierarchical hollow structure as high-performance anodes for lithium-ion batteries. (December 2017)

• Record Type: Journal Article
• Authors: Ma, Yuan; Ma, Yanjiao; Geiger, Dorin; Kaiser, Ute; Zhang, Huang; Kim, Guk-Tae; Diemant, Thomas; Behm, R. Jürgen; Varzi, Alberto; Passerini, Stefano
• Is Part Of: Nano energy. Volume 42(2017:Dec.)
• Page Start: 341
• Page End: 352
• Publication Date: 2017-12
• Subjects: Hierarchical hollow micro-polyhedrons -- Bi-component ZnO/ZnFe2O4 -- Nitrogen-doped carbon matrix -- Metal-organic frameworks -- Lithium-ion batteries -- In situ XRD diffraction; Nanoscience -- Periodicals; Nanotechnology -- Periodicals; Nanostructured materials -- Periodicals; Power resources -- Technological innovations -- Periodicals; Nanoscience; Nanostructured materials; Nanotechnology; Power resources -- Technological innovations; Periodicals; 621.042
• DOI: 10.1016/j.nanoen.2017.11.030
• Languages: English
• ISSNs: 2211-2855

Abstract

Abstract: In this work, a facile and potentially scalable self-template synthesis of bi-component ZnO/ZnFe2 O4 /N-doped C micro-polyhedrons with hierarchical hollow structure (ZZFO-C) is presented. These are obtained through calcination of a single bi-metallic metal-organic framework (MOF) precursor (ZIF-ZnFe, molar ratio of 3:1). The resulting material shows a high surface area and is constituted by the organized assembly of numerous nanoparticles sub-unit (with size in the range of 20 nm). By tuning the annealing conditions, porous ZnO/ZnFe2 O4 (ZZFO) micro-polyhedrons are obtained. The ZZFO-C composite materials are studied as anodes for LIBs exhibiting remarkable energy storage performance, such as, large reversible capacity (ca. 1000 mA h g −1 after 100 cycles at 200 mA g −1 ), excellent rate capability and cycling stability. After high-rate capacity testing (1000 cycles at 2.0 A g −1 ), ZZFO-C shows an excellent reversible capacity of 620 mA h g −1 . The excellent performance of ZZFO-C arises from its unique hierarchical hollow structure and the synergy between the two active components and the N-doped carbon matrix. The electrochemical reaction mechanism and structure phase changes upon the initial lithiation are identified via in situ X-ray diffraction studies. Graphical abstract: Highlights: ZnO/ZnFe2 O4 /N-doped C micro-polyhedrons with hierarchical hollow structure (ZZFO-C). ZZFO-C material exhibits remarkable energy storage performance as LIB anode. ZZFO-C shows synergy between the two active components and the N-doped carbon matrix. The reaction mechanism of ZZFO-C is revealed via in situ X-ray diffraction studies.