Manganese dioxide-anchored three-dimensional nitrogen-doped graphene hybrid aerogels as excellent anode materials for lithium ion batteries

Abstract

The capacity of manganese dioxide (MnO 2 ) deteriorates with cycling due to the irreversible changes induced by the repeated lithiation and delithiation processes. To overcome this drawback, MnO 2 /nitrogen-doped graphene hybrid aerogels (MNGAs) were prepared via a facile redox process between KMnO 4 and carbon within nitrogen-doped graphene hydrogels. The three-dimensional nitrogen-doped graphene hydrogels were prepared and utilized as matrices for MnO 2 deposition. The MNGAs-120 obtained after a deposition time of 120 min delivered a very high discharge capacity of 909 mA h g -1 after 200 cycles at a current density of 400 mA g -1 , in sharp contrast to only 280 and 70 mA h g -1 delivered from nitrogen-doped graphene aerogels and MnO 2 . This discharge capacity is superior to that of the previously reported MnO 2 /carbon based hybrid materials. This material also exhibited an excellent rate capability and cycling performance. Its superior electrochemical performance can be ascribed to the synergistic interaction between uniformly dispersed MnO 2 particles with high capacity and the conductive three-dimensional nitrogen-doped graphene network with a large surface area and an interconnected porous structure. Tel.: +86 10 8254 5576. E-mail: hanbh@nanoctr.cn.Tel.: +61 2 4221 3127. E-mail: gwallace@uow.edu.au. AbstractThe capacity of manganese dioxide (MnO 2 ) deteriorates with cycling due to the irreversible changes induced by the repeated lithiation and delithiation processes. To overcome this drawback, MnO 2 /nitrogen-doped graphene hybrid aerogels (MNGAs) were prepared via a facile redox process between KMnO 4 and carbon within nitrogen-doped graphene hydrogels. The three-dimensional nitrogen-doped graphene hydrogels were prepared and utilized as matrices for MnO 2 deposition. The MNGAs-120 obtained after a deposition time of 120 min delivered a very high discharge capacity of 909 mA h g -1 after 200 cycles at a current density of 400 mA g -1 , in sharp contrast to only 280 and 70 mA h g -1 delivered from nitrogen-doped graphene aerogels and MnO 2 . This discharge capacity is superior to that of the previously reported MnO 2 /carbon based hybrid materials. This material also exhibited an excellent rate capability and cycling performance.Its superior electrochemical performance can be ascribed to the synergistic interaction between uniformly dispersed MnO 2 particles with high capacity and the conductive three-dimensional nitrogen-doped graphene network with a large surface area and interconnected porous structure.

A highly nitrogen-doped porous graphene – an anode material for lithium ion batteries

“…The NPGM electrode shows a discharge capacity of 458 mA h g -1 at the 1 st cycle. 40 As shown in Fig. This slightly enhanced discharge capacity might be attributed to increased electrolyte access to the porous nanostructure of the electrode after the lithiation and delithiation processes, thus offering a higher electrochemical activity.…”

“…2a and b). 39,40 Compared to GO, the freeze-dried GOMF hydrogel displays an additional N 1s peak located at around 400 eV, which suggests the successful incorporation of MF. 2c), large 2D sheets can be observed and most sheets are folded.…”

Recent Advancements in the Cobalt Oxides, Manganese Oxides, and Their Composite As an Electrode Material for Supercapacitor: A Review

“…The MnO2 has α, β, γ, and δ -type polymorph Salunkhe et al, 2015). The advantages of manganese-based metal oxides include low cost, low toxicity, natural abundance, and environmental friendly in nature (Sui et al, 2015;Wei et al, 2015b). In aqueous and organic electrolyte, the MnO, MnO2, and Mn2O3 can form the different oxidation states.…”

“…In consequence, this reduces the specific capacitance of the manganese oxides-based supercapacitors (Cabana et al, 2010;Chen et al, 2010). To overcome such hindrances, recently, the researchers have been executing many new strategies, such as use of carbon containing materials for increasing the electrical conductivity and adopt the volume buffers for relaxing internal stresses (Yao et al, 2008;Sui et al, 2015). Manganese oxides have been prepared by various synthesis methods, such as pulse laser deposition method (Xia et al, 2011), hydrothermal method , electrochemical synthesis method (Jiang and Kucernak, 2002), redox deposition method (Bordjiba and Bélanger, 2009), successive hydrolysis-condensation method (Sawangphruk and Limtrakul, 2012), etc.…”

Morphology and phase tuning of α- and β-MnO2nanocacti evolved at varying modes of acid count for their well-coordinated energy storage and visible-light-driven photocatalytic behaviour

“…And, the inclined line indicates the solid state diffusion resistance of Li electrode. 64,65 In comparison, the diameter of the semicircle at the higher frequency region of cycled cell is higher than the fresh cell which implies the raise in charge transfer resistance caused by the destruction of the electrode structure upon the charging/discharging cycles. Also, the increase in the solid state diffusion resistance suggest the suppressed diffusion of Li + resulting in the low capacitance values.…”