Crepe Cake Structured Layered Double Hydroxide/Sulfur/Graphene as a Positive Electrode Material for Li-S Batteries

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• The polysulfide shuttle effect is a major obstacle to the commercialization of high-performance lithium-sulfur (Li-S) batteries.
• Developing stable and efficient positive electrode materials is crucial for overcoming this challenge.

Purpose of the Study:

• To design and fabricate a novel triphasic composite electrode material for Li-S batteries.
• To address the polysulfide shuttle problem and improve battery performance.

Main Methods:

• Fabrication of a layered double hydroxide (LDH)/sulfur/reduced graphene oxide (rGO) composite with a unique structure.
• Embedding sulfur nanoparticles within the LDH/rGO matrix to enhance protection.
• Characterization of the composite's physical and chemical properties and its electrochemical performance.

Main Results:

• The LDH/sulfur/rGO composite effectively encapsulates sulfur nanoparticles, preventing polysulfide dissolution.
• Strong chemical interactions (ionic bonds, hydrogen bonds) between LDH and polysulfides mitigate shuttle effects.
• The flexible structure accommodates sulfur volume expansion and promotes ion/electron transport.

Conclusions:

• The designed composite electrode demonstrates significant potential for advancing Li-S battery technology.
• This approach offers a promising strategy for the industrialization of Li-S batteries by solving the polysulfide shuttle problem.