Controlled growth of Co9S8 nanoparticle-embedded carbon nanosheets/carbon nanofibers toward high-performance sodium storage

Silan Wang; Ziyi Zhou; Bo Wen; Zhijie Zhang; Guorui Yang; Wei Yan

doi:10.1016/j.jcis.2023.06.001

Controlled growth of Co₉S₈ nanoparticle-embedded carbon nanosheets/carbon nanofibers toward high-performance sodium storage

J Colloid Interface Sci. 2023 Oct 15:648:644-653. doi: 10.1016/j.jcis.2023.06.001. Epub 2023 Jun 3.

Authors

Silan Wang¹, Ziyi Zhou², Bo Wen², Zhijie Zhang¹, Guorui Yang³, Wei Yan⁴

Affiliations

¹ Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, State Key Laboratory of Multiphase Flow in Power Engineering, Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
² Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, "Four Joint Subjects One Union" School-Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology, Department of Applied Chemistry, School of Chemistry, Xi'an Jiaotong University, Xi'an 710049, China.
³ Engineering Research Center of Energy Storage Materials and Devices, Ministry of Education, "Four Joint Subjects One Union" School-Enterprise Joint Research Center for Power Battery Recycling & Circulation Utilization Technology, Department of Applied Chemistry, School of Chemistry, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address: yangguorui@xjtu.edu.cn.
⁴ Xi'an Key Laboratory of Solid Waste Recycling and Resource Recovery, State Key Laboratory of Multiphase Flow in Power Engineering, Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China. Electronic address: yanwei@xjtu.edu.cn.

PMID: 37321083
DOI: 10.1016/j.jcis.2023.06.001

Abstract

Transition metal sulfides (TMSs) are considered as promising anodes for sodium-ion batteries (SIBs) due to their high theoretical capacity and low cost. However, TMSs suffer from massive volume expansion, slow sodium-ion diffusion kinetics, and poor electrical conductivity, which severely restrict their practical application. Herein, we design self-supporting Co₉S₈ nanoparticles embedded carbon nanosheets/carbon nanofibers (Co₉S₈@CNSs/CNFs) as anode materials for SIBs. The electrospun carbon nanofibers (CNFs) provide continuous conductive networks to accelerate the ion and electron diffusion/transport kinetics, while MOFs-derived carbon nanosheets (CNSs) buffer the volume variation of Co₉S₈, consequently improving the cycle stability. Benefitting from the unique design and pseudocapacitive features, Co₉S₈@CNSs/CNFs deliver a stable capacity of 516 mAh g^-1 at 200 mA g^-1 and a reversible capacity of 313 mAh g^-1 after 1500 cycles at 2 A g^-1. Note that, it also displays excellent sodium storage performance when assembled into a full cell. The rational design and excellent electrochemical properties endow Co₉S₈@CNSs/CNFs with the potential stepping into commercial SIBs.

Keywords: Anode; Co(9)S(8); Nanofibers; Pseudocapacitance; Sodium-ion batteries.