Most conventional batteries rely on flammable liquid electrolytes, but ASSLMBs represent a significant advancement by utilizing non-flammable solid materials to facilitate the flow of electrical charge between electrodes. While these batteries are inherently safer, they face a key challenge—repeated charging and discharging create gaps between the solid lithium metal anode and the solid electrolyte, leading to premature battery failure.
To overcome this issue, a team of researchers from the Chinese Academy of Sciences has developed a self-healing layer known as DAI (Dynamically Adaptive Interphase) to maintain the battery’s structural integrity. This dynamic layer introduces mobile iodide ions into the solid electrolyte during battery operation, filling any gaps that may form and effectively sealing the layers together. This innovative approach eliminates the need for high external pressure to compress the battery layers, a cumbersome and impractical solution.
The results of laboratory testing were impressive, with full battery cells retaining over 90% of their energy capacity after 2,400 charge and discharge cycles. Furthermore, a pouch cell—a common type of battery used in electronics and electric vehicles—maintained 74.4% of its capacity after 300 cycles without the application of external pressure.
The Potential of DAI Technology
While DAI is still in its early stages of development, its scalability could herald a new era for battery technology. The researchers believe that the DAI strategy represents a transformative shift in solid-state battery design, facilitating the widespread adoption of high-energy and sustainable electrochemical storage systems in existing energy networks. This self-healing solution has the potential to usher in a new era of safer, more durable batteries with extended lifespans.
By enabling electric vehicles with longer ranges and enhancing the reliability and sustainability of grid storage facilities, this technology holds immense promise for the future of energy storage. Additionally, the simplified manufacturing process—eliminating the need for high-pressure systems within battery packs—will make mass production more streamlined and cost-effective.
Crafted by our writer Paul Arnold, reviewed by Gaby Clark, and fact-checked by Robert Egan. This article is a testament to our commitment to independent science journalism, supported by readers like you. If you value our work, please consider donating to help us sustain our efforts. As a token of our gratitude, you’ll receive an ad-free account.
Additional Resources:
Guanjun Cen et al, Adaptive interphase enabled pressure-free all-solid-state lithium metal batteries, Nature Sustainability (2025). DOI: 10.1038/s41893-025-01649-y
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