Preparation and electrochemical properties of nitrogen‐doped carbon electrode material

Abstract

In order to improve the lithium storage capacity of lithium-ion battery anode materials, three nitrogen-doped and nitrogen-doped hollow carbon materials (Cw-GO), nitrogen-doped carbon aerogels, and three-dimensional nitrogen-doped porous carbon materials (PCMs) were prepared, and their electrochemical properties were studied. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), and nitrogen adsorption desorption instrument were used to detect the morphology and structure of the samples. The electrochemical properties of the samples were tested by cyclic voltammetry (CV), impedance spectroscopy (EIS), and cyclic charge discharge (GCD). The results show that the introduction of graphene oxide (GO) can improve the specific capacitance and electrochemical activity of the composites; nitrogen-doped carbon aerogel electrode material has better capacitance characteristics. PCM has a large specific surface area and a large capacitance response, which reaches 168.5 F g À1 at the current density of 1 A g À1 . When the current density is 10 A g À1 , 1000 cycles of constant current charge and discharge test is carried out. When the current density is 20 A g À1 , the specific capacitance of PCM keeps 88.3% of the original capacitance and has good electrochemical performance.

High‐performance Sn‐based anode with robust lignin‐derived hard carbon support for sodium‐ion batteries

“…However, severe lithium shortage and high cost prevent LIBs from being an ideal sustainable energy storage device 5,6 . It is imperative to discover a novel energy storage technology with low‐cost materials and high performance to substitute LIBs and meet explosive demand for electrical and electronic devices 7,8 . Sodium‐ion batteries (SIBs) have been regarded as the preferred replacement for LIBs on account of their low cost and abundant Na reserves, so the development of efficient electrochemical anodes for SIBs is undoubtedly urgent 9–11 .…”

“…5,6 It is imperative to discover a novel energy storage technology with low-cost materials and high performance to substitute LIBs and meet explosive demand for electrical and electronic devices. 7,8 Sodium-ion batteries (SIBs) have been regarded as the preferred replacement for LIBs on account of their low cost and abundant Na reserves, so the development of efficient electrochemical anodes for SIBs is undoubtedly urgent. [9][10][11] Graphite with a highly ordered layer structure has become a commercial anode material for LIBs but shows poor Na storage performance because of lower diffusion rate and larger ionic size of sodiumions (1.5 times the radius of Li-ions).…”

Recent developments of layered transition metal oxide cathodes for sodium‐ion batteries toward desired high performance

“…However, with more and more demand of lithium resource, the economic problems of LIBs are becoming increasingly prominent. Therefore, next‐generation batteries with lower cost and abundant raw materials than lithium are receiving more and more attention 8–11 . Among them, SIBs have been considered as the promising candidate because of the abundant reserves of sodium on the earth's crust and the similar intrinsic electrochemical properties with that of LIBs 12,13 .…”

“…Therefore, nextgeneration batteries with lower cost and abundant raw materials than lithium are receiving more and more attention. [8][9][10][11] Among them, SIBs have been considered as the promising candidate because of the abundant reserves of sodium on the earth's crust and the similar intrinsic electrochemical properties with that of LIBs. 12,13 In addition, Na + also has a more suitable redox potential (E 0 (Na + /Na) = 2.71 V vs. SHE), which is a little bit higher than that of the Li + .…”