Key Findings
Researchers at South Korea’s Dongguk University have produced an anode-free all-solid-state battery (ASSB) prototype that delivered a volumetric energy density of 235.13 Wh/L at the 100th cycle. The cell, which measures 2.77 micrometers in thickness, was tested at a cycling rate of 0.01 C. The prototype utilizes a lithium vanadium oxide (LVO) cathode and a lithium phosphorus oxynitride (LiPON) solid electrolyte.
Technical Details
The core innovation is an anode-less thin-film platform that replaces the conventional lithium-metal anode with an ultrathin tin/carbon (Sn/C) interlayer coated on a modified copper current collector. This interlayer functions as a seed for lithium nucleation, promoting uniform plating and reducing the formation of “dead” lithium and voids. Specifically, tin lowers the energy required to initiate deposition, while carbon ensures the lithium is distributed evenly.
To mitigate irreversible losses common in anode-free designs, the team implemented a “prelithiation” step, adding a small amount of metallic Li to the coated current collector before cycling. Microscopic analysis revealed that a three-dimensional structure of tin and lithium–tin alloy forms within the interlayer during the first deposition, which helps accommodate physical changes during subsequent cycles and maintains interface stability.
Background & Context
Solid-state batteries (SSBs) offer potential improvements in safety and energy density over traditional systems. However, they face significant hurdles, including high costs and manufacturing challenges. In stationary energy storage (BESS), SSBs struggle to displace lithium iron phosphate (LFP) batteries due to priorities regarding affordability and bankability. Technically, SSBs are often plagued by uneven lithium plating and stripping, which can lead to internal short circuits and accelerated degradation.
Significance & Outlook
The research, published in Advanced Energy Materials, demonstrates that interface engineering and lithium-inventory management can overcome the stability issues of anode-less thin-film batteries. The authors suggest this approach is applicable to the development of ultrathin batteries for medical devices, IoT sensors, and wearable electronics, as well as scalable ASSBs for industrial power applications.
Get our weekly technology intelligence — free
Receive an infographic that lets you judge at a glance whether each field’s analysis report is worth reading.
Subscribe Free — Weekly Tech Intelligence
By subscribing, you’ll receive Troy-Technical’s weekly technology intelligence newsletter.
- Your email and selected fields are used only to deliver the newsletter.
- We never share your information with third parties.
- You can unsubscribe anytime via the link in each email.
See our Privacy Policy for details.
Takes about a minute · Unsubscribe anytime
