N-Doped Carbon Boosted the Formation of Few-Layered MoS2 for High-Performance Lithium and Sodium Storage

Junfeng Li,Hengchao Sun,Shinbin Sun,Liang Li,Xuejiao Han,Chao Ma,Haibao Wang,Xianzi Zhou,Kai Lu

doi:10.3389/fmats.2021.739859

Abstract

Molybdenum sulfide (MoS2) has become a potential anode of lithium-ion batteries (LIBs) and sodium-ion batteries (SIBs) due to its high theoretical capacity and low cost. However, the volume expansion, poor electrical conductivity and dissolution of polysulfides in the electrolyte during the cycling process severely limited its applications. Herein, few-layered MoS2@N-doped carbon (F-MoS2@NC) was synthesized through a facile solvothermal and annealing process. It was found that the addition of N-doped carbon precursor could significantly promote the formation of few-layered MoS2 and improve the performances of lithium and sodium storage. A high reversible capacity of 482.6 mA h g−1 at a high current density of 2000 mA g−1 could be obtained for LIBs. When used as anode material for SIBs, F-MoS2@NC hybrids could maintain a reversible capacity of 171 mA h g−1 at a high current density of 1,000 mA g−1 after 600 cycles. This work should provide new insights into carbon hybrid anode materials for both LIBs and SIBs.

Highlights

During the last few decades, lithium-ion batteries (LIBs) have been used in almost every facets of people’s daily life, such as portable electronic products, electric vehicles and medical electronics (Tarascon and Armand, 2001; Li et al, 2019a; Ni et al, 2019a; Pu et al, 2021)
F-MoS2@NC demonstrates a reversible capacity of 482.6 mA h g−1 at 2000 mA g−1 for LIBs and maintains a reversible capacity of 171 mA h g−1 at of 1,000 mA g−1 after 600 cycles for sodium-ion batteries (SIBs)
In the subsequent solvothermal process, DAH was partially carbonized, and L-cysteine was used as reducing agent and sulfurizing agent to promote the conversion of NMD to MoS2

Summary

INTRODUCTION

During the last few decades, lithium-ion batteries (LIBs) have been used in almost every facets of people’s daily life, such as portable electronic products, electric vehicles and medical electronics (Tarascon and Armand, 2001; Li et al, 2019a; Ni et al, 2019a; Pu et al, 2021). The. N-doped Carbon, Few-Layered MoS2, Anode low activation energy is beneficial to the conversion reaction during charge/discharge process, while the high theoretical capacity of active material is vital to the energy density of both LIBs and SIBs (Yan et al, 2005; Yuan et al, 2011). The nano-scale particle size can effectively shorten the ion diffusion distance and promote the migration of alkali metal ions during the charge and discharge process (Hu et al, 2014; Kang et al, 2017) Another widely used method is to combine with conductive matrix such as amorphous carbon (Balogun et al, 2016). Cycling tests and cyclic voltammetry (CV) were performed within the voltage range of 0.005–3 V on a Land 2001A battery test system and electrochemical workstation (AUTOLAB PGSTA302N)

RESULTS AND DISCUSSION

CONCLUSION

DATA AVAILABILITY STATEMENT