A new approach to control lithium deposition in anode-free solid-state batteries
Discover how CSEM’s MgC bilayer interphase stabilizes the interface, improves reversibility, and paves the way toward industrial performance.
Anode-free all-solid-state batteries promise higher energy density and improved safety. Yet they often fail at the interface that will define their industrial future: the Li-metal/solid-electrolyte boundary, where unreliable lithium deposition drives inhomogeneous lithium-metal growth and severely limits lifetime.
If your challenge is to secure a viable solid‑state battery roadmap, the anode/solid-electrolyte interface is your number one risk. CSEM’s MgC bilayer approach is designed to turn the unstable behavior of these batteries into a more controlled and predictable system, simplifying qualification, testing, and industrial transfer.1
In anode-free all-solid-state batteries, lithium plates onto the current collector during charging and strips during discharge. Without controlled nucleation, lithium deposits become uneven, increasing polarization, disrupting interfacial contact, and accelerating degradation.
The result is clear: battery cell capacity can fade rapidly within just a few cycles.
CSEM’s MgC approach
In a recent publication, CSEM and its partners present a multifunctional MgC bilayer interphase designed to improve control over lithium plating/and stripping in anode‑free solid‑state batteries. The aim is not simply to add another layer, but to engineer an interface that enables more controlled and reversible battery behavior from the very first cycles.
According to the abstract, both Mg and C undergo lithiation before plating begins. The difference in nucleation overpotential between lithiated carbon (LiC) and lithiated magnesium (LiMg) drives lithium through the LiC layer, promoting controlled deposition at the LiC/LiMg interface. Cross-sectional SEM imaging supports this regulated deposition mechanism.
The report results show stable mAh/cm² at room temperature, with an average coulombic efficiency above 99%.
For non‑specialists, the benefit is straightforward:
- better‑controlled lithium deposition → a more stable battery
- a more stable interface → less performance loss
- better reversibility → less lithium lost over repeated cycles
Why does this advance matter?
Teams worldwide are racing to make anode-free solid-state batteries viable. Their strategies include improving surface lithiophilicity to enhance lithium wetting, managing stack pressure, introducing alloy interlayers, and implementing seeded nucleation approaches.
CSEM’s difference lies in a multifunctional interface design that does not just encourage lithium deposition, but controls where it takes place. That control is critical: it can determine whether the Limetal/solid electrolyte interface remains stable or starts to deteriorate
Drawing on decades of thin-film deposition expertise from industries such as photovoltaics and watchmaking, CSEM brings proven precision and manufacturing know-how to one of battery engineering’s most decisive challenges.
What comes next for industry?
This work remains at an advanced R&D stage, but it already sends a clear industrial message: the interface can be engineered through seeds, wetting, pressure, and multilayer architecture, and this is where anode‑free reversibility is won or lost.
For an “industry‑grade” evaluation of MgC the next steps are clear:
1. Map the operating window across current density, areal capacity, and stack pressure.
2. Validate performance in formats that are closer to real-world use.
3. Conduct a systematic post‑mortem analysis.
Source: Solid-State Batteries: Controlled Lithium Deposition with MgC Interphase
