Journal
SCRIPTA MATERIALIA
Volume 211, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.114495
Keywords
MnO microspheres; N-doped carbon coating; Porous structure; Additive-free anode; Electrochemical performance
Categories
Funding
- Guangdong Science and Technology Project [2016B090927009, 2016B090927002]
- Guangzhou Science and Technology Project [201805010 0 01]
- Special projects in Universities' key fields of Guangdong Province [2020ZDZX2002]
- State Key Laboratory of New Ceramic and Fine Processing Tsinghua University [KF202009]
- Guangdong Polytechnic Normal University
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Novel N-doped carbon coated porous hierarchical MnO microspheres have been successfully synthesized via simultaneous pyrolysis of MnCO3 and polyacrylonitrile (PAN) at low calcination temperature. The micro/nano structure with uniform N-doped carbon coating, suitable interior pores, and tiny primary MnO nanocrystals significantly enhance the electronic conductivity, reduce the irreversible solid-electrolyte interphase (SEI) layer, accommodate volume changes, and enable easier redox reactions, resulting in high reversible capacity and remarkable long-term cycling stability.
Novel N-doped carbon coated porous hierarchical MnO microspheres have been successfully synthesized via the simultaneous pyrolysis of MnCO3 and polyacrylonitrile (PAN) at low calcination temperature. The micro/nano structure with uniform N-doped carbon coating, suitable interior pores and tiny primary MnO nanocrystals can significantly increase the electronic conductivity of the composite, reduce the amount of irreversible solid-electrolyte interphase (SEI) layer, accommodate the huge volume change of MnO during cycling and facilitate easier redox reaction of Mn2+/Mnx+ (x > 2) to generate extra capacity. By using partially pyrolytic PAN as the conductive agent and binder, the obtained additive-free MnO-based electrode (MnO@NC-S) demonstrates a high reversible capacity of 998 mAh g(-1) after 100 cycles at 0.1 A g(-1) and remarkable long-term cycling stability with the capacity of 629 mAh g(-1) after 500 cycles at 0.5 A g(-1). (C) 2022 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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