Facile preparation of N-doped MnO/rGO composite as an anode material for high-performance lithium-ion batteries
Abstract
An N-doped MnO/rGO composite (N-MnO/rGO) was successfully fabricated by a one-step hydrothermal method in which histidine and potassium permanganate (KMnO4) reacted in water containing graphene oxide, and the product was then calcinated in a nitrogen (N2) atmosphere. The N-MnO/rGO presents an excellent lithium-storage capability. It shows a high reversible specific capacity of 1020 mA h g-1 at a current density of 200 mA g-1 after 150 cycles and 760 mA h g-1 at a current density of 500 mA g-1 after 200 cycles. Meanwhile, the N-MnO/rGO sample presents a stable rate capability from 100 to 2000 mA g-1. Even at 2000 mA g-1, the electrode delivers 335 mA h g-1, which is higher than the capability for the pure MnO particles and rGO sheets. The outstanding electrochemical performances of the N-MnO/rGO electrodes may be attributed to the combined effect of the rGO with N-doping that can effectively buffer the large volume expansion of the MnO particles and can enhance the transport rates of lithium ions and electrons during lithium cycling.
- Publication:
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Applied Surface Science
- Pub Date:
- January 2019
- DOI:
- 10.1016/j.apsusc.2018.09.151
- Bibcode:
- 2019ApSS..465..470P
- Keywords:
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- MnO/rGO composite;
- N-doped;
- Anode;
- High-performance;
- Lithium-ion batteries