Sandwich-like SnS₂/graphene multilayers for efficient lithium/sodium storage

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Two-dimensional (2D) materials are highly sought after for energy storage and conversion applications due to their exceptional electrochemical properties.
• Tin disulfide (SnS₂) is a promising 2D material, but its application in energy storage requires optimized structures for enhanced performance.

Purpose of the Study:

• To synthesize and investigate the performance of monolayer SnS₂ sheets within SnS₂/graphene multilayers for efficient lithium and sodium storage.
• To explore the synergistic effects between SnS₂ and graphene in a multilayer architecture for improved electrochemical energy storage.

Main Methods:

• Solution-phase direct assembly utilizing electrostatic interactions between monolayer SnS₂ and polydimethyl diallyl ammonium chloride (PDDA)-graphene nanosheets.
• Fabrication of SnS₂/graphene multilayer electrodes for electrochemical testing in lithium and sodium-ion batteries.

Main Results:

• The SnS₂/graphene multilayer electrode exhibited significant pseudocapacitance, leading to enhanced lithium and sodium storage.
• Demonstrated stable reversible capacities of ~160 mA h g^-1 at 2 A g^-1 after 2000 cycles for lithium storage and ~142 mA h g^-1 at 1 A g^-1 after 1000 cycles for sodium storage.
• The synergistic effect between monolayer SnS₂ and PDDA-graphene nanosheets was identified as key to the excellent electrochemical performance.

Conclusions:

• The developed SnS₂/graphene multilayer structure provides an efficient platform for advanced energy storage applications.
• This work highlights the potential of 2D materials assembled into multilayer architectures for future energy storage and conversion technologies.