Toward Practical Solid-State Lithium Batteries With High-Nickel Cathodes: An Interface-Centered Perspective

Area of Science:

• Materials Science
• Electrochemistry
• Energy Storage

Background:

• Growing demand for advanced energy storage systems (e.g., solid-state lithium batteries - SSLBs) driven by renewable energy transition.
• Limitations of conventional lithium-ion batteries, primarily flammability and instability of liquid electrolytes.
• SSLBs offer enhanced safety and potential for higher energy density using solid-state electrolytes (SSEs).

Purpose of the Study:

• To review recent progress in SSLBs utilizing high-nickel layered oxide cathodes.
• To address challenges in integrating high-nickel cathodes with SSEs, focusing on structural degradation and interfacial instability.
• To provide perspectives on material innovation and scalable manufacturing for next-generation SSLBs.

Main Methods:

• Review of structural and surface engineering strategies for high-nickel cathodes.
• Analysis of optimization approaches for various SSEs (oxide, sulfide, halide, polymer).
• Examination of interface-engineering techniques, including buffer layers and in situ interfacial design.

Main Results:

• High-nickel layered oxides (LiNi$_{x}$Co$_{y}$Mn$_{1-x-y}$O$_{2}$, x ≥ 0.8) show promise due to high capacity and cost-effectiveness.
• Integration challenges include cathode structural degradation, oxygen release, and interfacial resistance with SSEs.
• Surface engineering, SSE optimization, and interface design are crucial for mitigating these issues and improving cycling durability.

Conclusions:

• SSLBs with high-nickel cathodes represent a viable path toward safer, high-energy-density storage solutions.
• Overcoming interfacial instability and structural degradation is key to unlocking the full potential of these systems.
• Further research in material innovation, advanced characterization, and scalable manufacturing is needed for practical deployment.