Breakthrough in Solid-State Lithium Metal Batteries

Researchers at Sun Yat-sen University in Guangzhou, People's Republic of China, have made a significant advancement in the development of solid-state lithium metal batteries with high safety and long lifespan. The team has developed an in situ 3D-printed integrated porous cathode/composite polymer electrolyte (CPE) using reversible Diels-Alder (DA) covalent chemistry. This innovation addresses the bottleneck of unstable solid-solid interfaces and uneven Li transport in traditional SSLMBs.

Key Takeaways:

• The researchers have developed a customized solid-state lithium metal battery with high safety and long lifespan, achieving remarkable cycling stability with 30,000 cycles at 10 C in LiFePO||Li cells.
• The 3D printing technique enables the fabrication of customized batteries and integrated functional devices that maintain stable operation under mechanical deformation, showing potential for wearable and flexible electronics applications.
• The research utilizes a reversible Diels-Alder (DA) covalent chemistry to create a continuous Li transport network, allowing for uniform Li deposition and remarkable cycling stability.
• The integrated system also features a robustly adaptive interface layer with low impedance, which reforms upon cooling, enabling stable Li plating/stripping over 4,150 h in symmetric cells.
• The development of this technology addresses the pressing need for high-energy, high-power, and long-lifespan battery systems for emerging applications such as wearable electronics and flexible devices.

Statistics:

• 30,000 cycles: the number of cycles achieved by the integrated SSLMB system at 10 C in LiFePO||Li cells.
• 4,150 h: the stable Li plating/stripping time achieved by the integrated system in symmetric cells.
• 10 C: the charging rate at which the integrated SSLMB system achieves remarkable cycling stability.
• 3D printing technique: enables the fabrication of customized batteries and integrated functional devices with stable operation under mechanical deformation.

Sources:

• Ultra-Long Life Solid-State Lithium Metal Batteries Enabled by 3D-Printing of Integrated Porous Cathode/Composite Polymer Electrolyte with Dynamic Covalent Bonds. Advanced Materials, 2025.
• NewsRx. New Science Data Have Been Reported by Researchers at Sun Yat-sen University (Ultra-Long Life Solid-State Lithium Metal Batteries Enabled by 3D-Printing of Integrated Porous Cathode/Composite Polymer Electrolyte with Dynamic Covalent Bonds). Chemicals & Chemistry. August 15, 2025; p 1998.
• National Natural Science Foundation of China.