Issue 14, 2019

In situ N-doped carbon modified (Co0.5Ni0.5)9S8 solid-solution hollow spheres as high-capacity anodes for sodium-ion batteries

Abstract

Sodium ion batteries (SIBs) have been widely considered as a competitive alternative to construct low-cost and large-scale energy storage system. Unfortunately, low energy density and poor cycle life are main issues that need prompt solutions. Herein, an effective and controllable strategy, using metal–organic framework (MOF) precursors, was utilized to fabricate in situ N-doped carbon modified bimetallic sulfide hollow spheres with different metal ratios. When used as the anode material for SIBs, (Co0.5Ni0.5)9S8 solid-solution combined with in situ N-doped carbon ((Co0.5Ni0.5)9S8/N–C) is demonstrated to balance several aspects to deliver a superior electrochemical performance. (Co0.5Ni0.5)9S8/N–C exhibits the high specific capacity of 723.7 mA h g−1 at the 100th cycle at the current of 1.0 A g−1 and a high rate performance with the capacity of 569.1 mA h g−1 at 10 A g−1, yielding the high capacity retention of 60.2% compared with the capacity of 0.1 A g−1 (945.1 mA h g−1). The fast sodium storage capability is promoted by the capacitive contribution. Meanwhile, ex situ XRD is used to study the phase transition of the solid solution anode during the Na-storage process. The excellent performance can be attributed to the incorporation of Ni into the Co9S8 phase, in situ N–C coating and a stable hollow structure.

Graphical abstract: In situ N-doped carbon modified (Co0.5Ni0.5)9S8 solid-solution hollow spheres as high-capacity anodes for sodium-ion batteries

Supplementary files

Article information

Article type
Paper
Submitted
19 Jan 2019
Accepted
04 Mar 2019
First published
05 Mar 2019

J. Mater. Chem. A, 2019,7, 8268-8276

In situ N-doped carbon modified (Co0.5Ni0.5)9S8 solid-solution hollow spheres as high-capacity anodes for sodium-ion batteries

D. Cao, W. Kang, S. Wang, Y. Wang, K. Sun, L. Yang, X. Zhou, D. Sun and Y. Cao, J. Mater. Chem. A, 2019, 7, 8268 DOI: 10.1039/C9TA00709A

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