Nitrogen-doped porous carbon microspheres for high-rate anode material in lithium-ion batteries

Abstract

Developing high-capacity anode materials is urgent for next-generation lithium-ion batteries (LIBs) with the increasing need of larger scale applications. In order to obtain suitable anode materials, nitrogen-doped porous carbon microspheres (NPCMs) were prepared via spray drying followed by carbonization using chitosan as both carbon and nitrogen sources. The structure and properties of NPCMs were characterized by thermogravimetric, Raman spectroscopic, x-ray diffraction, scanning electron microscopic, transmission electron microscopic as well as x-ray photoelectron spectroscopic analysis, and the electrochemical performance of NPCM electrodes were also evaluated. The results show that the diameter of the obtained microspheres is 1–7 μm. When used as the anode material, the NPCMs display a reversible capacity of 443 mAh g−1 at 100 mA g−1 after 120 cycles and maintain a high capacity of 377 mAh g−1 at 1 A g−1 after 500 cycles. Even at a high current density of 4 A g−1, a discharge capacity of 256 mAh g−1 can also be obtained. The excellent rate performance and long cycle life of the electrode might be ascribed to the nitrogen-doping, porous and amorphous structure of NPCMs. The results suggest that the prepared NPCMs have the potential to be used as a promising anode material for high-capacity LIBs.

Nitrogen self-doped carbon with super high-rate and long cycle life as anode materials for lithium-ion batteries

“…35 Compared to graphitized nitrogen (N-Q), pyridine nitrogen (N-6) substitute carbon atom at the edge of defect or graphite plane with nitrogen atom, which makes it easier to obtain electrons. 36 Furthermore, pyridine nitrogen can produce more defects and a large number of active centers, which is considered to be the most effective coordination nitrogen to improve the electrode capacity 37,38 The long cyclability of as-prepared samples at 1 A g À1 as shown in Fig. 5(a).…”

Cobalt phosphide nanoparticles supported within network of N-doped carbon nanotubes as a multifunctional and scalable electrocatalyst for water splitting

“…4. SEM images of (a) bare CP and (b) CP@NCNT; (c, d) TEM images of CP@NCNT and (e) the EDX elemental mapping of C, Co, P, and N mal method, CP@NCNT still show much smaller particle size and lower level of aggregation compared with most of the previously reported spray-dried materials [20,34,35] .…”

Nano Silicon Composite with Gelatin/Melamine Derived N-doped Carbon as an Efficient Anode Material for Li-ion Batteries

“…It is also evident that nitrogen (N) doping of the carbon material can significantly increase its electrical conductivity, which is highly beneficial for long cycle life and superior rate performance [27,28]. For N doping we selected melamine, which is a good source of N, with non-toxicity and low cost [29].…”