How does Molybdenum Disulfide Store Charge: A Minireview

Abstract

MoS2 has attracted tremendous attention as a promising electrode material for rechargeable alkali metal ion (Li+, Na+, K+) batteries due to its high capacity and low cost. However, the practical application of MoS2 for energy storage has not been achieved yet, which is restricted by its intrinsic charge‐storage behavior. Debates still exist in this field although great efforts have been made to reveal alkali metal ion (Li+, Na+, K+) storage mechanism of MoS2. This Minireview aims to provide an analysis and summary of the related phase conversion, structure collapse, and loss of active material in a MoS2 electrode during the intercalation/extraction process of alkali metal ions. Hence, the fundamental understanding about the charge storage in MoS2 is of importance for the rational design of MoS2 electrodes with excellent electrochemical performance.

Crosslinking Nanoarchitectonics of Nitrogen‐doped Carbon/MoS2 Nanosheets/Ti3C2Tx MXene Hybrids for Highly Reversible Sodium Storage

“…In regard to the MoS 2 /Ti 3 C 2 T x (Figure 5d), its initial coulombic efficiency is 72.5 %, and the discharge/charge profiles remain well even after 50 cycles. In principle, most of the specific capacities of MoS 2 /Ti 3 C 2 T x @NC and MoS 2 /Ti 3 C 2 T x originate from MoS 2 , which undergoes both intercalation and conversion reactions upon cycling but inevitably results in structure degradation, leading to the decay of specific capacity [40] . In this context, the discharge/charge profiles of Ti 3 C 2 T x @NC are more stable but with low capacity compared with those of MoS 2 /Ti 3 C 2 T x @NC and MoS 2 /Ti 3 C 2 T x , which can be proved by the almost overlapped profiles in Figure S7 (Supporting Information).…”

“…Upon the initial discharging, the intensity of E 1 2g peak gradually decreases, along with the well‐maintained A 1g peak, demonstrating no obvious phase change upon the initial insertion of Na + . After further discharging, the E 1 2g peak disappears and the A 1g peak broadens, which should be ascribed to the structure change through the conversion reaction [40] . As for the charging process, the initial desodiation causes the appearance of E 1 2g peak, and the broad peak is gradually divided into two peaks (E 1 2g and A 1g ), returning to the pristine state, which shows high reversibility [6a] .…”

Fast Charging Anode Materials for Lithium‐Ion Batteries: Current Status and Perspectives

“…[240] Van der Waals forces between the layers are weak, which facilitates to the rapid insertion and extraction of lithium ions. During the intercalation process of Li + , MoS 2 gradually transforms from the 2H phase with semiconductor characteristics to the 1T phase with metal characteristics, and then sustains a conversion reaction to form Li 2 S and Mo nanoparticles, which can be expressed as follows Equations (9-11): [241] MoS Li e Li MoS…”

“…[ 240 ] Van der Waals forces between the layers are weak, which facilitates to the rapid insertion and extraction of lithium ions. During the intercalation process of Li + , MoS 2 gradually transforms from the 2H phase with semiconductor characteristics to the 1T phase with metal characteristics, and then sustains a conversion reaction to form Li 2 S and Mo nanoparticles, which can be expressed as follows Equations (9–11): [ 241 ] In terms of the reversibility of the conversion reaction, whether the metal Mo particles can be reoxidized to form MoS 2 , remains a big controversy. When MoS 2 is exfoliated into a monolayer, the lithium storage mechanism changes to surface/interface storage.…”

Thiolated poly(aspartic acid)-functionalized two-dimensional MoS2, chitosan and bismuth film as a sensor platform for cadmium ion detection

“…[39][40][41] MoS 2 has unique properties including good exibility, a tunable bandgap energy controlled by the number of layers and planar electric transportation property. [42][43][44][45] Due to its fascinating characteristics, MoS 2 has received much attention for construction of promising electronics devices, for example, eld-effect transistors, lithium-ion batteries, etc. [46][47][48][49] However, exploring more binding sites on MoS 2 for Cd 2+ is still challenging, and this is the key to achieve excellent low detection limit and sensitivity.…”