Solvent Induced Activation Reaction of MoS₂ Nanosheets within Nitrogen/Sulfur‐Codoped Carbon Network Boosting Sodium Ion Storage

Abstract

MoS2, as a classical 2D material, becomes a capable anode candidate for sodium‐ion batteries. However, MoS2 presents a disparate electrochemical performance in the ether‐based and ester‐based electrolyte with unclear mechanism. Herein, tiny MoS2 nanosheets embedded in nitrogen/sulfur‐codoped carbon (MoS2@NSC) networks are designed and fabricated through an uncomplicated solvothermal method. Thanks to the ether‐based electrolyte, the MoS2@NSC shows a unique capacity growth in the original stage of cycling. But in the ester‐based electrolyte, MoS2@NSC shows a usual capacity decay. The increasing capacity puts down to the gradual transformation from MoS2 to MoS3 with the structure reconstruction. Based on the above mechanism, MoS2@NSC demonstrates an excellent recyclability and the specific capacity keeps around 286 mAh g−1 at 5 A g−1 after 5000 cycles with an ultralow capacity fading rate of only 0.0034% per cycle. In addition, a MoS2@NSC‖Na3V2(PO4)3 full cell with ether‐based electrolyte is assembled and demonstrates a capacity of 71 mAh g−1, suggesting the potential application of MoS2@NSC. Here the electrochemical conversion mechanism of MoS2 is revealed in the ether‐based electrolyte and significance of the electrolyte design on the promoting Na ion storage behavior is highlighted.

A hierarchical nano-MoS2 flake/micro-MXene lamellar complex structure within a carbon coating for rapid sodium-ion storage

“…In contrast, the oxidation peaks of the subsequent anodic scanning located at 0.42, 0.95, and 1.83 V are in accord with the reverse reaction from NaS 2 to 1T-Na x MoS 2 , phase variation from 1T to 2H-Na x MoS 2 , and the reconstruction of MoS 2 . 50…”

“…4f reveal a steady change in the voltage plateau under a series of current densities, which facilitates capacity enhancement. 50 The excellent high-rate performance is attributed to the compact stacking of micron-MXene and nano-MoS 2 to form a fast convey highway for ions and electrons. The long-cycle performance of the MSVC@C electrode was further explored and is presented in Fig.…”

“…7g. 16,17,42,45,50,59–61 Fig. 7h shows the long-term cycling performance of MSNC@C and MSNC anodes at 0.5 A g −1 .…”

Antimony Sulfide-Based Materials for Electrochemical Energy Conversion and Storage: Advances, Challenges, and Prospects

“…It is well-known that an electrolyte serves a crucial role in SIBs. The energy densities of battery systems and the stability of voltage windows could be effectively improved by using suitable electrolytes. − As well-matched aprotic electrolytes for TMSs, ether-based electrolytes with strong stability were employed to boost the electrochemical performance of Sb 2 S 3 /SnS 2 /C as shown in Figure d. In NaPF 6 -diglyme electrolyte systems, the capacity could be kept at about 642 mAh g –1 at 1.0 A g –1 after 600 cycles .…”

Rapid Carbonization of Anthracite Coal via Flash Joule Heating for Sodium Ion Storage

“…Sodium-ion batteries (SIBs) are considered strong candidates for the postlithium era. Various types of anodes are used in SIBs, including traditional carbon materials, sodium alloy anodes, − metal oxide nanomaterials, − organic material, and sodium metal anodes . Among these, carbon materials remain the most promising option for commercialization.…”