Ni-Rich Layered Oxide Cathodes/Sulfide Electrolyte Interface in Solid-State Lithium Battery.

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Ni-rich layered oxide (NRLO) cathodes offer high specific capacity and low cost for next-generation lithium-ion batteries.
• Current NRLO cathodes face challenges with structural and interfacial instability, exacerbated by flammable organic liquid electrolytes.
• Sulfide solid electrolytes present a safer alternative due to high ionic conductivity and processability, crucial for all-solid-state lithium batteries (ASSLBs).

Purpose of the Study:

• To review and summarize the interfacial challenges between NRLO cathodes and sulfide solid electrolytes in ASSLBs.
• To explore and present strategies for improving the interface stability in these systems.
• To highlight urgent scientific and technological challenges and propose future research directions for enhanced ASSLBs.

Main Methods:

• Literature review and synthesis of existing research on NRLO cathode/sulfide electrolyte interfaces.
• Analysis of interfacial problems and proposed solutions.
• Identification of key research gaps and future directions.

Main Results:

• The interfacial incompatibility between NRLO cathodes and sulfide solid electrolytes is a critical bottleneck for high-performance ASSLBs.
• Various strategies exist to mitigate interfacial issues, though further optimization is needed.
• Understanding and addressing these interfacial challenges are key to unlocking the potential of NRLO-based ASSLBs.

Conclusions:

• Improving the interface stability between Ni-rich layered oxide cathodes and sulfide solid electrolytes is essential for advancing sulfide ASSLBs.
• Further research is required to overcome current scientific and technological hurdles.
• This review provides a comprehensive understanding and recommendations for developing safer, high-energy-density ASSLBs.