High lithium anodic performance of highly nitrogen-doped porous carbon prepared from a metal-organic framework

Abstract

Theoretical and experimental results have revealed that the lithium-ion storage capacity for nitrogen-doped graphene largely depends on the nitrogen-doping level. However, most nitrogen-doped carbon materials used for lithium-ion batteries are reported to have a nitrogen content of approximately 10 wt% because a higher number of nitrogen atoms in the two-dimensional honeycomb lattice can result in structural instability. Here we report nitrogen-doped graphene particle analogues with a nitrogen content of up to 17.72 wt% that are prepared by the pyrolysis of a nitrogen-containing zeolitic imidazolate framework at 800°C under a nitrogen atmosphere. As an anode material for lithium-ion batteries, these particles retain a capacity of 2,132 mA h g À 1 after 50 cycles at a current density of 100 mA g À 1 , and 785 mAh g À 1 after 1,000 cycles at 5 A g À 1 . The remarkable performance results from the graphene analogous particles doped with nitrogen within the hexagonal lattice and edges.

Bimetallic zeolite imidazolate framework for enhanced lithium storage boosted by the redox participation of nitrogen atoms

“…Based on the above ex-situ tests, it is reasonable to draw the following conclusion: (1) more Li-ions can be inserted in the CoZn-ZIF structures when compared with Co-ZIF-67 and Zn-ZIF-8, which leads to a high reversible capacity of 605.8 mA h g −1 at a current density of 100 mA g −1 for CoZn-ZIF; (2) accompanying with Li insertion/extraction, most Co-N bonds would gradually break/regenerate upon the formation/dissociation process of Li-N bonds; (3) the incomplete recoordination of Co-N during delithiation would lead to the formation of nitrogen radicals and the collapse of long range order for CoZn-ZIF. It also should be mentioned that a high N content in ZIF-8 derived porous carbon contributes to a high specific capacity for the adsorbtion of Li by the N atoms [20]. In this article, to activate the N atoms for Li storage, bimetallic ZIF was reasonablely designed and the synergistic effect finally makes N atom to be a reversible lithiation sites.…”

“…However, MOFs-based electrodes with other kinds of organic linkers are seldom employed in LIBs for the lack of highly-active lithiation sites. Regarding to ZIFs, although they have been intensively used as sacrificial templates or cladding materials to develop carbon [20,21], ZnO [22], Sn/C [23] or thin film [24] for LIBs, their direct application as highperformance lithium storage electrode materials is still challenging. Tang et al [25] recently reported the use of thin-film ZIF-8 and ZIF-67 electrodes as anodes for LIBs.…”

N,S Co-Doped Carbon Nanofibers Derived from Bacterial Cellulose/Poly(Methylene blue) Hybrids: Efficient Electrocatalyst for Oxygen Reduction Reaction

“…To elucidate the crystallinity of N/S-CNF, X-ray powder diffraction (XRD) and Raman spectroscopic investigation were conducted. The XRD patterns of the N/S-CNF and the control samples show a broad peak at approximately 2θ = 24° and a very weak peak at 2θ = 42° (Figure 5b), which are the characteristics of graphitic carbon materials with low graphitization degree [40]. Raman spectra (Figure 5c) further reveal that both amorphous and crystalline carbon coexist in these samples.…”

Physical Properties of Sulfur Based Binarycomposites for Lithium Sulfur Batteries

“…This peculiar property subsequently enriches the conductivity by means of π-electron cloud. This defect might arise in the SN41 binary composite due to the partial replacement of carbon atom by thenitrogen [26].…”