What happened
- A team led by Hyeongseok Lee, Jihun Sung and Seongsoo Park published on November 7, 2026 in Nature Communications a solid-state lithium metal battery that operates at room temperature and with stack pressure of 0.3 megapascals or less.
- The cell combines two pieces: a composite solid electrolyte, modified with thioctic acid and able to polymerize on its own, and a porous carbon-matrix current collector.
- With a nickel-cobalt-manganese cathode (LiNi0.8Co0.1Mn0.1O2) and a loading of 2.4 mAh per square centimeter, at 0.1 C, the battery achieved stable long-term cycling.
- This summary is based on the paper’s abstract.
Why it matters
Solid-state lithium metal batteries promise more energy density and more safety than lithium-ion batteries with liquid electrolyte. Their practical obstacle, according to the paper itself, is that they perform poorly at room temperature and low pressure for two reasons: lithium dendrites, which are metal filaments, and interface degradation induced by mechanical stress.
Many lab cells are tested pressed tight at high pressures, which help keep contact between layers but are hard to reproduce inside a commercial pack. Dropping to 0.3 MPa or less brings the design closer to something manufacturable.
The number
0.3 MPa or less. That is the stack pressure at which the cell operates stably, at room temperature. It is the condition the authors call “near-ambient,” and the central point of the work.
Context
The authors’ strategy controls how the lithium deforms. The electrolyte, with thioctic acid, tolerates stress and slows lithium “creep,” its slow flow into the material. The porous carbon collector does the opposite on the metal side: it relaxes stress locally and lets lithium deposit in its internal voids.
The authors conclude that controlling lithium deformation and stress relaxation is what matters for practical solid-state batteries. The abstract gives no cycle-life or energy-density figures, so those numbers remain to be learned from the full text, which was not reviewed.
At Mamífero we have followed the race for solid batteries. A lithium-rich cathode with tungsten delivered 543 Wh/kg in a Fudan solid-state cell, Saft opened in Bordeaux its first solid-state battery line for aviation, the electrolyte decides how long a lithium battery lasts and the Pentagon offered 6K $250 million for a battery plant.
What’s next
- It remains to be seen whether the design holds in larger cells with more capacity per area.
- Other groups will have to replicate the electrolyte-and-collector combination to confirm the stable cycling.
- Manufacturers will say whether 0.3 MPa is enough to integrate the cell into a real pack.
Bottom line
The advance is not a new chemistry but a way to reduce the pressure these cells need to work. For it to matter outside the lab, its cycle and capacity figures at larger scale will have to be seen.
Sources
- Lee, H., Sung, J., Park, S. et al., “Coupling electrolyte mechanical reinforcement and interfacial stress relaxation for near-ambient sulfide all-solid-state lithium metal batteries”, Nature Communications, November 7, 2026, DOI 10.1038/s41467-026-79393-w, link. The note is based on the paper’s abstract.
- Cover image: Sevenethics, CC0, via Wikimedia Commons
Edited by Rodrigo Cornejo. How we select and verify: who writes these notes.
