• Project acronym: SOLiDIFY
  • Project title: Liquid-Processed Solid-State Li-metal Battery – development of upscale materials, processes and architectures
  • Start date: Juanuary 1st, 2020
  • Duration 48 months
  • Call: H2020-LC-BAT-2019
  • Type of action: RIA (Research and Innovation Action)
  • Current phase: grant management


The SOLiDIFY project proposes a unique manufacturing process and solid-electrolyte material to fabricate Lithium-metal solid-state batteries – known as Gen. 4b on the EU battery roadmap. The concept is based on a solid nanocomposite electrolyte or nano-SCE. It is made by a sol-gel reaction which is used advantageously for a liquid-to-solid approach in the fabrication of the composite cathode and the solid-electrolyte separator. The general strategy to reach the target energy density of 1200Wh/L (400Wh/kg) in 20 minutes charging time is: (1) enabling the integration of high-energy NMC active materials and (2) development of new electrode architectures for high mass loading and enabled by the liquid-to-solid approach. An added imposed challenge is a water-based cell assembly process. To this end, suitable protection of the highenergy NMC powder with ALD thin-film coatings is pursued. Finally, thin lithium foils with protective artificial interphase coatings will be developed for lamination on the nano-SCE separator. The main goal of SOLiDIFY is to bring the liquid-processed solid-state cell fabrication concept from demonstration in the lab (TRL3) to demonstration of prototypes in pilot line (TRL6), with upscaling of the concept both towards (1) the development of manufacturable materials and processes and (2) the discovery of full cell assembly schemes with ultimate demonstration of 1Ah pouch cells. The material research will focus on (1) solutions enabling the upscaling process and manufacturability and (2) further improvement of cell integration steps to enhance performance. Manufacturable parameters such cost, environmental impact and recycling will also be handled. The larger scope of the SOLiDIFY project entails the development of a novel and potentially European-lead solid-state battery technology with fully covered EU value chain.

Our role

Gemmate Technologies is in charge of developing a full 3D multi-physics model of the battery cell based on the finite element approach.Thermal and electrochemical phenomena will be simulated and a validation of the simplified 1D model against the full 3D approach will be performed.

In parallel, Gemmate Technologies leads the environmental impact and sustainability assessment of the different materials and processes investigated in the project.


The SOLiDIFY consortium represents a healthy balance between SME, LE and non-profit organizations spreading the battery value chain over 7 different member states. This balanced mix of industrial and research partners specialized in specific and complementary areas enables both innovation opportunities and an optimal exploitation route.