High-Energy All-Solid-State Lithium Batteries with Ultralong Cycle Life

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• All-solid-state lithium batteries face challenges in energy and power density due to poor interfacial compatibility and slow ion transfer.
• Achieving intimate contact at the cathode-solid electrolyte interface and high ionic conductivity in solid electrolytes is critical for high-performance batteries.

Purpose of the Study:

• To develop a general interfacial architecture for high-performance all-solid-state lithium batteries.
• To improve the interfacial contact between electrodes and solid electrolytes.
• To enhance lithium ion transfer kinetics.

Main Methods:

• An in situ liquid-phase approach was used to anchor Li7P3S11 electrolyte particles onto cobalt sulfide nanosheets.
• The synthesized Li7P3S11 electrolyte exhibited high ionic conductivity.
• All-solid-state lithium batteries were assembled using cobalt sulfide-Li7P3S11 nanocomposites, neat Li7P3S11 electrolyte, Super P, and lithium metal anode.

Main Results:

• The anchored Li7P3S11 particles were approximately 10 nm, the smallest reported, increasing interfacial contact area.
• The neat Li7P3S11 electrolyte showed high ionic conductivity (1.5 × 10^-3 S cm^-1).
• The assembled batteries demonstrated excellent rate capability and cycling stability, with a reversible capacity of 421 mAh g^-1 after 1000 cycles.

Conclusions:

• The novel interfacial design significantly enhances performance of all-solid-state lithium batteries.
• The approach offers a promising strategy for developing high-energy and high-power density solid-state batteries.
• This work paves the way for advanced solid-state battery technologies.