Garnet solid-state electrolyte with benzenedithiolate catholyte for rechargeable lithium batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Chemistry

Background:

• Rechargeable lithium batteries face challenges with dendrite formation and capacity fade due to electrolyte crossover.
• Lithium 1,2-benzenedithiolate (LBDT) is a component in catholytes that can migrate to the anode, degrading battery performance.
• Solid-state electrolytes offer potential solutions for improved safety and stability in lithium batteries.

Purpose of the Study:

• To investigate the efficacy of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) as a barrier against LBDT crossover in lithium metal batteries.
• To evaluate the impact of LLZTO on the cycle life and interfacial properties of the battery.
• To understand the interaction mechanism between LBDT and the LLZTO solid-state electrolyte.

Main Methods:

• Fabrication and electrochemical testing of a rechargeable lithium battery incorporating an LLZTO solid-state electrolyte.
• Cyclic voltammetry and impedance spectroscopy to assess battery performance and interfacial resistance.
• Density functional theory (DFT) simulations to model the interaction between LBDT and LLZTO.

Main Results:

• The LLZTO solid-state electrolyte successfully blocked the crossover of LBDT from the catholyte to the lithium metal anode.
• The battery exhibited a relatively stable cycle life, retaining 65.6% of its capacity after 100 cycles.
• DFT simulations confirmed a strong interaction between LBDT and LLZTO, indicating reduced interfacial resistance.

Conclusions:

• LLZTO is an effective solid-state electrolyte for preventing LBDT crossover in rechargeable lithium batteries.
• The use of LLZTO contributes to improved cycle stability and potentially lower interfacial resistance.
• The strong LBDT-LLZTO interaction elucidated by DFT supports its application in advanced lithium battery designs.