Synthesis of Nitrogen-Doped MnO/Graphene Nanosheets Hybrid Material for Lithium Ion Batteries

Abstract

Nitrogen-doped MnO/graphene nanosheets (N-MnO/GNS) hybrid material was synthesized by a simple hydrothermal method followed by ammonia annealing. The samples were systematically investigated by X-ray diffraction analysis, Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, and atomic force microscopy. N-doped MnO (N-MnO) nanoparticles were homogenously anchored on the thin layers of N-doped GNS (N-GNS) to form an efficient electronic/ionic mixed conducting network. This nanostructured hybrid exhibited a reversible electrochemical lithium storage capacity as high as 772 mAh g(-1) at 100 mA g(-1) after 90 cycles, and an excellent rate capability of 202 mA h g(-1) at a high current density of 5 A g(-1). It is expected that N-MnO/GNS hybrid could be a promising candidate material as a high capacity anode for lithium ion batteries.

Enhanced rate performance of cobalt oxide/nitrogen doped graphene composite for lithium ion batteries

“…In addition, the nitrogen doping could introduce a large number of defects on the rGO, which could further enhance its lithium storage properties and electrochemical performance. 42 It is worth noting that the capacity of Co 3 O 4 /N-rGO is higher than that of Co 3 O 4 /rGO on returning to the low current rate of 100 mA g -1 , indicating better reversibility after nitrogen doping. The electrochemical performance of our Co 3 O 4 /N-rGO is better than that of the cobalt oxide/graphene nanocomposite reported by Wang et al 44 , the cobalt oxide nanoparticles on graphene nanosheets reported by Hsieh et al, 45 as well as the grapheneencapsulated mesoporous Co 3 O 4 composite microspheres reported by Yang et al 46 in terms of rate capability, and the cobalt oxide nanowall arrays on reduced graphene oxide sheets reported by Zhu et al 47 in terms of cycling performance.…”

“…It was reported that carbon atoms are more chemically active on the edges or defect sites in the graphene plane than within the plane 22 and that they are inclined to be replaced by pyridinic N at these chemically active sites. 25,42 The doped nitrogen atoms provide favorable nucleation and anchoring sites for Co 3 O 4 nanocrystals because of their coordination with Co cations. 31 Therefore, there are more Co 3 O 4 nanocrystals on the edge than the inner area of the N-doped rGO, which can be observed from the TEM images.…”

High rate capability of TiO2/nitrogen-doped graphene nanocomposite as an anode material for lithium–ion batteries

“…Besides, nitrogen-doped graphene have been used as electronic conducting framework to improve the lithium storage properties. In this regard, nitrogen-doped graphene/SnO 2 [28], nitrogen-doped graphene/MnO [29] and nitrogen-doped graphene/Fe 2 O 3 [30] hybrids or composite are proved to be able to improve rate capacity and enhance cycle life of lithium-ion batteries. It is believed that the nitrogen-doped graphene provides more active sites to control the growth of metal oxide nanoparticles.…”

In Situ Self-Developed Nanoscale MnO/MEG Composite Anode Material for Lithium-Ion Battery

“…The Raman scattering peak observed at ∼637 cm −1 should correspond to the Mn-O vibration mode. 29,30 The peak at ∼1360 cm −1 (D band) was attributed to the sp 3 hybridized C-C bonds that stemmed from the distorted hexagonal lattice in the graphite layers, and the peak at ∼1580 cm −1 (G band) originated from the in-plane vibrations of sp 2 hybridized C-C bonds. The intensity ratio of D and G bands (I D /I G ) is usually used to evaluate the graphitization degree of carbon.…”