Amorphous MoS3-modified porous Co4S3-embedded N,S co-doped carbon polyhedron as new high-capacity and high-rate anode materials for sodium-ion half/full cells

Jiawen Yan; Ke Sang; Xiaohan Jiang; Qiming Li; Fuyi Jiang; Yanli Zhou

doi:10.1016/j.jcis.2023.10.137

Amorphous MoS₃-modified porous Co₄S₃-embedded N,S co-doped carbon polyhedron as new high-capacity and high-rate anode materials for sodium-ion half/full cells

J Colloid Interface Sci. 2024 Feb:655:100-109. doi: 10.1016/j.jcis.2023.10.137. Epub 2023 Oct 30.

Authors

Jiawen Yan¹, Ke Sang¹, Xiaohan Jiang¹, Qiming Li¹, Fuyi Jiang¹, Yanli Zhou²

Affiliations

¹ School of Environmental and Material Engineering, Yantai University, Yantai 264005, PR China.
² School of Environmental and Material Engineering, Yantai University, Yantai 264005, PR China. Electronic address: zhouyanli@ytu.edu.cn.

PMID: 37925966
DOI: 10.1016/j.jcis.2023.10.137

Abstract

In this study, amorphous MoS₃-modified porous Co₄S₃-embedded N,S co-doped carbon polyhedron (Co₄S₃@NSC/MoS₃) was rationally prepared via a multi-step method. One-dimensional linear-like MoS₃ with a high specific capacity of 894 mAh g^-1 and abundant active sites compensated for the low capacity of Co₄S₃, thus enhancing the sodium ion storage capacity of the entire electrode. Moreover, three-dimensional N,S co-doped carbon networks (NSC) significantly inhibited large volumetric fluctuations in Co₄S₃ and MoS₃, thereby sustaining the structural stability and enhancing the electron transfer efficiency. As a new anode material for sodium-ion half batteries, the constructed Co₄S₃@NSC/MoS₃ with rapid Na⁺ diffusion and charge transfer kinetics demonstrated better sodium storage properties than Co₄S₃@NSC. At a rate of 0.5 A g^-1 over 100 cycles, the reversible specific capacity of Co₄S₃@NSC/MoS₃ reached 594 mAh g^-1. Even when cycled at a rate of 2 A g^-1 for 600 cycles, the charge capacity was stable at 435 mAh g^-1. The rate performance of Co₄S₃@NSC/MoS₃ was also found to be remarkable; when the rate increased to 10 A g^-1, the average capacity was retained at 382 mAh g^-1. Apart from half cells, reduced graphene oxide (rGO)-modified Na₃V₂(PO₄)₃ composite (Na₃V₂(PO₄)₃@rGO) was used as the cathode material to match with Co₄S₃@NSC/MoS₃. The assembled full batteries were analyzed and their electrochemical properties were discussed. They also exhibited outstanding rate capability and high-rate long-life cyclic property. Even at 1 A g^-1 over 500 cycles, the discharge capacity was stably maintained at 246 mAh g^-1. The outstanding sodium storage properties of Co₄S₃@NSC/MoS₃ mainly depended on the cooperative effects of MoS₃ and Co₄S₃@NSC, indicating the potential application of Co₄S₃@NSC/MoS₃ in energy storage fields.

Keywords: Anode materials; Co(4)S(3); MoS(3); N, S co-doped carbon; Sodium storage.