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Reshaping two-dimensional MoS₂ for superior magnesium-ion battery anodes.

Donghai Wu¹, Baocheng Yang¹, Shouren Zhang¹

¹Henan Key Laboratory of Nanocomposites and Applications, Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006, China.

Journal of Colloid and Interface Science

|April 24, 2021

Summary

Researchers developed a new buckled molybdenum disulfide (B-MoS₂) structure for superior magnesium-ion batteries. This novel material enhances electron transfer for high capacity and fast charging, offering new insights into energy storage mechanisms.

Keywords:

Interfacial electron transfer Magnesium-ion battery Metal ion battery MoS(2)Multiscale mechanism Subinterfacial electron transfer

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Area of Science:

Materials Science
Electrochemistry
Energy Storage

Background:

Two-dimensional (2D) molybdenum disulfide (MoS₂) monolayers are crucial for energy storage applications.
Current strategies focus on activating interfacial electron transfer to enhance performance.
A need exists for novel material structures that promote superior electron transfer mechanisms.

Purpose of the Study:

To design and reconfigure 2D MoS₂ into a new stable structure, B-MoS₂, for enhanced energy storage.
To investigate the multiscale mechanisms underlying magnesium-ion (Mg²⁺) and lithium-ion (Li⁺) storage in B-MoS₂.
To explore the potential of B-MoS₂ as a high-performance anode material for magnesium-ion batteries (MgIBs).

Main Methods:

Rational design and structural reconfiguration of 2D MoS₂ to create the B-MoS₂ structure with a buckled square lattice.
Theoretical investigation of interfacial and subinterfacial electron transfer mechanisms.
Analysis of ion storage mechanisms at the atomic level (insertion-adsorption or adsorption-insertion).

Main Results:

The B-MoS₂ monolayer exhibits a high capacity of 921.3 mA h g^-1 and a low average open circuit voltage of 0.154 V for MgIBs.
High capacity is attributed to interfacial and subinterfacial electron transfer between metal ions and B-MoS₂.
B-MoS₂ demonstrates intrinsic metallic properties, enhanced electronic conductivity, and low Mg²⁺ migration barriers (∼0.604 eV), enabling fast charge/discharge rates.

Conclusions:

The novel B-MoS₂ structure serves as a promising anode material for high-performance magnesium-ion batteries.
The study introduces novel concepts of subinterfacial electron transfer activation for advanced energy storage materials.
New multiscale mechanisms for ion storage in the MoS₂ family have been proposed.