Cl- and Al-Doped Argyrodite Solid Electrolyte Li₆PS₅Cl for All-Solid-State Lithium Batteries with Improved Ionic...

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Chemistry

Background:

• Argyrodite solid electrolytes, like lithium phosphorus sulfur chloride (Li6PS5Cl), are crucial for all-solid-state lithium batteries due to their high ionic conductivity.
• Improving the ionic transport properties of these electrolytes is key to advancing battery technology.

Purpose of the Study:

• To enhance the ionic conductivity of Li6PS5Cl solid electrolytes.
• To investigate the effects of co-doping with chlorine (Cl) and aluminum (Al) on the electrochemical properties of Li6PS5Cl.
• To evaluate the potential of doped Li6PS5Cl as a solid electrolyte for all-solid-state lithium batteries.

Main Methods:

• Synthesis and characterization of co-doped Li6PS5Cl (Li5.4Al0.1PS4.7Cl1.3) solid electrolyte.
• Electrochemical analysis, including ionic conductivity measurements at room temperature.
• Arrhenius analysis to determine activation energy.

Main Results:

• The ionic conductivity of the Cl- and Al-doped Li6PS5Cl reached 7.29 × 10^-3 S cm^-1 at room temperature.
• This conductivity is 4.7 times higher than that of the undoped Li6PS5Cl.
• The doped electrolyte exhibited a low activation energy of 0.09 eV.

Conclusions:

• Co-doping of Li6PS5Cl with Cl and Al significantly improves ionic conductivity.
• The enhanced ionic conductivity and low activation energy make Li5.4Al0.1PS4.7Cl1.3 a promising candidate for all-solid-state lithium batteries.
• Substitution of cations and anions is an effective strategy for optimizing solid electrolyte performance.