Preparation and Electrochemical Performance of CoSe₂−MnSe₂ for Application in Lithium‐Ion Batteries

Abstract

In recent years, lithium‐ion batteries (LIBs) have been widely used in many fields, and research on LIBs electrode materials have attracted much attention. Among them, transition metal selenides (TMSs) are the most promising candidates in the next generation LIBs due to their high theoretical specific capacity and electrical conductivity. However, poor cycle stability and severe volume variation result in serious capacity decay during the charge/discharge process, limiting the practical application. In this paper, CoSe2−MnSe2 composites are synthesized via Co−Mn‐based metal‐organic framework (MOF) precursor. Meanwhile, three types of materials are successfully synthesized including CoSe2‐MnSe2@reduced graphene oxide (rGO), CoSe2‐MnSe2@polypyrrole (PPy), and CoSe2‐MnSe2/glucose (C). According to the electrochemical test results, it can be seen that the electrochemical performance of CoSe2−MnSe2 has been improved significantly. CoSe2‐MnSe2@rGO electrode materials, in particular, of which the inactivation defect sites and special carbon structure of rGO could provide more attachment points for ions. Due to the perfect combination of rGO and CoSe2−MnSe2, the CoSe2‐MnSe2@rGO composites display outstanding rate performance (1266 mA h g−1 at current densities of 100 mA g−1) and high reversible capacity (1169 after 150 cycles at 100 mA g−1). We believe that CoSe2‐MnSe2@rGO is a kind of very promising anode material.

Nitrogen-Doped Porous Ag–C@Co3O4 Nanocomposite for Boosting Lithium Ion Batteries

“…The uniform morphology of the interconnected porous network of Ag-MOGs is demonstrated in Figure 3A,B, which reveals the porous and fibrous nature of the obtained Ag-MOGs. It can be seen directly from the diameter of the fiber within 50 nm, and therefore the complex defects of electrode materials can improve the cycle stability, 5 which is means that an increased mechanical cushioning can be provided during the charge and discharge process in the anode system. 38 Figure 3C shows the carbon rod phases calcined in a high-temperature atmosphere.…”

Hybrid ZnSe‐SnSe2 Nanoparticles Embedded in N‐doped Carbon Nanocube Heterostructures with Enhanced and Ultra‐stable Lithium‐Storage Performance

“…The higher specific capacity than the theoretical capacity of 725.8 mA h g −1 (557 ZnSe ×34.3 %+814 SnSe2 ×65.7 %=725.8 mA h g −1 ) mainly arise from the electrolyte decomposition and the formation of SEI film on the carbon nanocubes surface [27,31,36] . The high coulombic efficiency which is higher than other selenides with the carbon composites is due to the low content of carbon shell in uniform ZSS⊂NCNs and is benefits for the applying in commercial LIBs anodes [19,46,50,53,54] . After 3 pre‐lithiations, a high reversible specific capacity of 727.9 mA h g −1 at the current density of 0.2 A g −1 is delivered, then the capacity increased gradually and presents a reversible capacity of 846.6 mA h g −1 after 100 cycles.…”

“…and transition metal selenides (MnSe, ZnSe, SnSe 2 , FeSe 2 and CoSe etc.) [15–22] . Specifically, metallic selenides can be as a promising anode materials attribute to higher electric conductive, weaker metal‐Se ionic bonds and larger interstitial sizes than transition metal sulfides, and present excellent ions kinetics and electrochemical properties [23–26] …”

MoP2/C@rGO synthesised by phosphating the molybdenum-based metal organic framework and GO coating with excellent lithium ion storage performance

“…In recent years, with the rapid development of portable energy and new energy vehicles, the demand for sustainable energy storage equipment has risen sharply, [1][2][3][4][5][6][7] where rechargeable lithium-ion batteries (LIBs), with high energy density, safety and reliability, and good cycling performance, have attracted the most attention. [8][9][10] However, graphite, as a traditional anode material, cannot meet the current development demand due to its low Li storage capacity.…”