Issue 13, 2021

Spray-dried assembly of 3D N,P-Co-doped graphene microspheres embedded with core–shell CoP/MoP@C nanoparticles for enhanced lithium-ion storage

Abstract

The advancement of novel synthetic approaches for micro/nanostructural manipulation of transition metal phosphide (TMP) materials with precisely controlled engineering is crucial to realize their practical use in batteries. Here, we develop a novel spray-drying strategy to construct three-dimensional (3D) N,P co-doped graphene (G-NP) microspheres embedded with core–shell CoP@C and MoP@C nanoparticles (CoP@C⊂G-NP, MoP@⊂G-NP). This intentional design shows a close correlation between the microstructural G-NP and chemistry of the core–shell CoP@C/MoP@C nanoparticle system that contributes towards their anode performance in lithium-ion batteries (LIBs). The obtained structure features a conformal porous G-NP framework prepared via the co-doping of heteroatoms (N,P) that features a 3D conductive highway that allows rapid ion and electron passage and maintains the overall structural integrity of the material. The interior carbon shell can efficiently restrain volume evolution and prevent CoP/MoP nanoparticle aggregation, providing excellent mechanical stability. As a result, the CoP@C⊂G-NP and MoP@⊂G-NP composites deliver high specific capacities of 823.6 and 602.9 mA h g−1 at a current density of 0.1 A g−1 and exhibit excellent cycling stabilities of 438 and 301 mA h g−1 after 500 and 800 cycles at 1 A g−1. The present work details a novel approach to fabricate core–shell TMPs@C⊂G-NP-based electrode materials for use in next-generation LIBs and can be expanded to other potential energy storage applications.

Graphical abstract: Spray-dried assembly of 3D N,P-Co-doped graphene microspheres embedded with core–shell CoP/MoP@C nanoparticles for enhanced lithium-ion storage

Supplementary files

Article information

Article type
Paper
Submitted
20 Jan 2021
Accepted
27 Feb 2021
First published
02 Mar 2021

Dalton Trans., 2021,50, 4555-4566

Spray-dried assembly of 3D N,P-Co-doped graphene microspheres embedded with core–shell CoP/MoP@C nanoparticles for enhanced lithium-ion storage

I. Muhammad, M. Jabeen, P. Wang, Y. He, X. Liao and Z. Ma, Dalton Trans., 2021, 50, 4555 DOI: 10.1039/D1DT00210D

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