A cost-effective Ca-doped Li₂ZrCl₆ halide solid electrolyte for all-solid-state lithium batteries.

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Batteries

Background:

• Developing safe and efficient solid electrolytes is crucial for next-generation energy storage.
• Traditional liquid electrolytes pose safety risks and limit battery performance.

Purpose of the Study:

• To synthesize a cost-effective Ca2+-substituted Li2ZrCl6 solid electrolyte.
• To evaluate its electrochemical properties and compatibility with cathode materials.
• To assess the performance of an all-solid-state battery utilizing this novel solid electrolyte.

Main Methods:

• Mechanochemical synthesis of Ca2+-substituted Li2ZrCl6 solid electrolyte.
• Electrochemical characterization including ionic conductivity and electrochemical window measurements.
• Fabrication and testing of an all-solid-state battery with LiCoO2 cathode.

Main Results:

• Achieved high Li+ conductivity and a wide electrochemical window for the solid electrolyte.
• Demonstrated excellent compatibility with 4 V-class cathodes.
• The all-solid-state battery with LiCoO2 exhibited stable cycling for 150 cycles at 1C, retaining 83.1% of its capacity.

Conclusions:

• The Ca2+-substituted Li2ZrCl6 solid electrolyte is a promising candidate for high-performance and safe all-solid-state batteries.
• The mechanochemical fabrication method offers a cost-effective route for producing advanced solid electrolytes.
• This work contributes to the advancement of solid-state battery technology for electric vehicles and portable electronics.