Gradual gradient distribution composite solid electrolyte for solid-state lithium metal batteries with ameliorated...

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Composite solid electrolytes (CSEs) are key for safer, high-energy lithium metal batteries.
• Challenges include low ion conductivity and lithium dendrite formation.

Purpose of the Study:

• To develop novel CSEs with a gradient structure to enhance ionic conductivity and inhibit lithium dendrites.
• To improve electrode compatibility and overall battery performance.

Main Methods:

• Fabrication of CSEs with a gradient distribution of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) ceramic and polymer.
• Characterization of ionic conductivity and electrochemical stability.
• Testing of LiFePO4 (LFP)|GCSE|Li coin cell batteries.

Main Results:

• The gradient composite solid electrolyte (GCSE) achieved an ionic conductivity of 1.5 × 10-4 S cm-1 at room temperature.
• Stable lithium cycling for over 1200 hours was observed.
• LFP|GCSE|Li batteries showed excellent rate performance and retained 90% capacity after 200 cycles at 60°C.

Conclusions:

• Gradient structured solid electrolytes offer significant advantages for ion transport and dendrite suppression.
• These findings are expected to accelerate the practical application of lithium metal batteries.