SOLIDBAT Partner Insights - Cidetec

As a key technological partner in the SOLIDBAT project, CIDETEC contributes its expertise in electrode manufacturing, advanced electrolytes, and cell prototyping to accelerate the development of next-generation solid-state batteries. In this interview, CIDETEC explains how innovative aqueous processing, scalable manufacturing approaches, and advanced characterization techniques are driving more sustainable, high-performance battery solutions for future electric mobility.

• Why did you join the SOLIDBAT project?

CID has a strong expertise in lithium-based solid-state batteries, particularly in polymer and hybrid electrolytes, electrode manufacturing, and cell prototyping. This expertise directly aligns with SOLIDBAT’s core innovation areas including hybrid gel polymer electrolytes (HGPEs), Ni-rich cathodes, and lithium-metal anodes.

•  Which innovative concept will be developed by CIDETEC within the project?

CID will develop an aqueous manufacturing process for high-voltage cathodes for solid-state batteries (SSBs). Additionally, CID is responsible for roll-to-roll (R2R) water-based coating processes for high-loading positive electrodes. To develop and apply advanced characterisation and operando diagnostic methods to understand, monitor, and optimize the solid–solid interfaces in SOLIDBAT’s all-solid-state battery cells.

•  What are the key advantages and main challenges of the cathode development proposed in SOLIDBAT?

  • Advantages: Lower cost, greener process, industrial scalability, higher energy density, and improved interface stability.
  • Challenges: Achieving uniform coatings, cathode–electrolyte compatibility, and mechanical integrity at high loadings.

• How will this development contribute to KPIs such as energy density, sustainability and cost?

  • Energy density: High-loading coated NMC811 cathodes (≈200 mAh/g) enable cell-level energy densities >400 Wh/kg and 1000 Wh/L
  • Sustainability: Aqueous manufacturing avoids toxic solvents (e.g., NMP), lowers emissions, and aligns with EU environmental standards
  • Cost: Water-based R2R coating reduces processing cost and facilitates compatibility with existing Li-ion production lines, targeting 75 €/kWh by 2030

• How can SOLIDBAT’s batteries help to position Europe in the race for electric vehicles?

  • Creating a European-owned, sustainable SSB technology adaptable to gigafactory production.
  • Reducing dependence on Asian supply chains and foreign IP.
  • Enhancing industrial competitiveness, green innovation, and job creation.
  • Delivering safer, more affordable, high-energy batteries that accelerate EV adoption and support EU climate neutrality goals