ZIF-67-Derived CoSe/NC Composites as Anode Materials for Lithium-Ion Batteries

Abstract

As a typical metal selenide, CoSe is a kind of foreground anode material for lithium-ion batteries (LIBs) because of its two-dimensional layer structure, good electrical conductivity, and high theoretical capacity. In this work, the original CoSe/N-doped carbon (CoSe/NC) composites were synthesized using ZIF-67 as a precursor, in which the CoSe nanoparticles are encapsulated in NC nanolayers and they are connected through C–Se bonds. The coating structure and strong chemical coupling make the NC nanolayers could better effectively enhance the lithium storage properties of CoSe/NC composites. As a consequence, the CoSe/NC composites deliver a reversible capacity of 310.11 mAh g−1 after 500 cycles at 1.0 A g−1. Besides, the CoSe/NC composites show a distinct incremental behavior of capacity.

Facile Synthesis of CoSe/Co3O4-CNTs/NF Composite Electrode for High-Performance Asymmetric Supercapacitor

“…The full XPS survey spectrum of CoSe/Co 3 O 4 -CNTs/NF represents the co-existence of Co and Se elements ( Figure S7a ). Two major peaks at 795.92 and 780.48 eV in the high-resolution XPS spectrum of Co 2 p ( Figure S7b ) correspond to the Co 2 p 1/2 and 2 p 3/2 , with two satellites at 802.51 and 784.73 eV, respectively [ 34 , 39 , 40 , 41 , 42 , 43 ], which suggests the presence of Co 2+ . Figure S7c shows the detailed analysis of Se 3 d high-resolution XPS spectra at a lower energy.…”

“…Figure S7c shows the detailed analysis of Se 3 d high-resolution XPS spectra at a lower energy. Although there is interference on the Co 3 p line on 59.1 eV, the emerged peaks at 55.8 and 54.8 eV can be appointed to the Se 3 d 3/2 and 3 d 5/2 [ 41 , 44 ], suggesting that the Se elemental mainly exists in Se 2 − . XPS results verify the successful formation of CoSe on the Co 3 O 4 -CNTs/NF substrate.…”

Electrochemical performance of CoSe2 with mixed phases decorated with N-doped rGO in potassium-ion batteries

“…In addition, the peak at 173.7 cm À1 (A g ) is assigned to the Se-Se in CoSe 2 @N-rGO, while a tiny peak associated with C-Se bond appears at 677.2 cm À1 (A 1g ). [36][37][38] The presence of C-Se bond between CoSe 2 and N-rGO is not simple physical contact but it is a kind of chemical connection through C-Se bond.…”

Recent Developments of Two-Dimensional Anode Materials and Their Composites in Lithium-Ion Batteries

“…The structure of TMDs is MX 2 , where M is a transition metal element (Ti, W, V, and Mo, etc. ), and X is Te, Se, or S. Common 2D TMDs include MoS 2 , VS 2 , VSe 2 , WS 2 , and so on. − Each layer of TMDs is bonded by van der Waals force, and TMD monolayer is made of stacked triatomic layers. In terms of lithium energy storage, TMDs have higher specific capacity and better cycle stability than traditional carbon anodes due to their special lamellar structure.…”