Critical Resources has achieved a key milestone by depositing a complete solid-state battery cathode layer in one dry, solvent-free step, potentially simplifying and cutting costs in battery production for high-demand sectors.
- Single-step dry deposition of cathode, electrolyte, and conductor
- Solvent-free process eliminates drying ovens and binders
- Targets defence, aerospace, and high-density computing markets
- Parallel workstreams de-risk manufacturing and materials challenges
- Full-format pouch cell development and testing underway
A Manufacturing Leap for Solid-State Batteries
Critical Resources Limited (ASX:CRR) has crossed an important threshold in its solid-state battery program by successfully depositing a composite cathode layer, combining cathode material, solid electrolyte, and a carbon-nanotube conductive network, in a single dry, room-temperature step. This solvent-free process removes the need for binders, solvents, and energy-intensive drying ovens, potentially slashing the cost and complexity of manufacturing next-generation lithium-ion batteries.
The breakthrough, developed in collaboration with the South Dakota School of Mines & Technology under the US National Science Foundation-supported Centre for Solid-State Electric Power Storage (CEPS), replaces a chain of conventional manufacturing steps with a streamlined “3D printing”-style deposition. By accelerating prepared materials onto a substrate in one pass, the process tackles the notoriously difficult interface between cathode and electrolyte, a common failure point in solid-state cells, by co-depositing them simultaneously.
Technical Details and Strategic Implications
The composite layer comprises lithium iron phosphate (LFP) as the cathode, lithium lanthanum zirconium oxide (LLZO) as the reference solid electrolyte, and a carbon-nanotube (CNT) network embedded to enhance conductivity. Scanning electron microscope images reveal a dense, uniform coating about 15 microns thick, with well-distributed electrolyte and intact nanotube networks. Embedding CNTs during deposition rather than mixing them in slurry reflects an advanced materials engineering approach aimed at differentiating CRR’s IP portfolio.
CRR’s approach is not to manufacture batteries themselves but to develop licensable intellectual property for solvent-free, scalable manufacturing. The company holds exclusive options on a portfolio of solid-state battery patents, including technologies developed with NASA support, reinforcing its position in high-value markets such as defence, aerospace, and high-density computing, sectors where conventional lithium-ion batteries struggle with safety, thermal stability, and energy density.
Parallel Workstreams to De-Risk Technology
The company is advancing two complementary workstreams: the Amorphous Solid-State Electrolyte (ASE) program focusing on electrolyte materials’ ionic conductivity and stability, and the Dry Supersonic Deposition (DSD) manufacturing program validating solvent-free fabrication. Recent benchmark results from the ASE program demonstrated ionic conductivities among the highest reported for non-sulphide electrolytes, while the DSD milestone confirms that these materials can be reliably manufactured without solvents or furnaces.
Electrochemical testing of coin cells incorporating the composite layer is underway, with early results showing expected charge and discharge behaviour. The next steps include developing full-format pouch cells for independent evaluation and optimizing deposition parameters to widen the process’s operating window.
Potential Market Impact and Future Directions
The solvent-free, low-temperature deposition method offers form-factor flexibility, enabling batteries to be printed to conform to platform geometries rather than standard cell shapes. This could reduce mass and thermal management hardware, a critical advantage for aerospace and satellite applications. The technology’s enhanced safety profile, eliminating flammable liquid electrolytes, and thermal stability across extreme temperatures align with emerging requirements in defence and high-density computing sectors.
While still at an early laboratory stage, the milestone marks a significant step in addressing the manufacturing bottleneck that has held back solid-state battery commercialisation. The company’s disciplined, capital-light evaluation strategy seeks to systematically de-risk the technology before moving toward licensing and partnership opportunities.
Bottom Line?
Critical Resources’ single-step, solvent-free deposition marks a pivotal advance in solid-state battery manufacturing, but commercial viability hinges on forthcoming electrochemical results and scale-up validation.
Questions in the middle?
- How will the electrochemical performance of full-format pouch cells compare to coin-cell benchmarks?
- Can the dry deposition process be scaled economically while maintaining consistent layer quality?
- What licensing or partnership opportunities will emerge as CRR de-risks its manufacturing IP?