CoSe₂ Nanoparticles Encapsulated by N-Doped Carbon Framework Intertwined with Carbon Nanotubes: High-Performance Dual-Role Anode Materials for Both Li- and Na-Ion Batteries.

ABSTRACT: It is of fundamental and technological significance to develop dual-role anode materials for both lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) with high performance. Here, a composite material based on CoSe₂ nanoparticles encapsulated in N-doped carbon framework intertwined with carbon nanotubes (CoSe₂@N-CF/CNTs) is prepared successfully from cobalt-based zeolitic imidazolate framework (ZIF-67). As anode materials for LIBs, CoSe₂@N-CF/CNTs composites deliver a reversible capacity of 428 mAh g^-1 even after 500 cycles at a current density of 1 A g^-1 with almost 100% Coulombic efficiency. The charge and discharge mechanisms of CoSe₂ are characterized using ex situ X-ray diffraction and Raman analysis, from which

SUBMITTER: Yang J 

PROVIDER: S-EPMC6299709 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature