SOLIDBAT Partner Insights - Hydro Quebec

As a pioneer in lithium-metal solid-state battery technology, Hydro-Québec (HQ) brings decades of experience in anode development and scalable manufacturing processes to the SOLIDBAT project. In this interview, HQ shares how its expertise in lithium metal processing and surface engineering is contributing to the development of high-energy, long-lasting solid-state batteries, while strengthening collaboration between European and international partners.

• Why did you join the SOLIDBAT project?

HQ has been a pioneer in solid-state battery technology based on polymer and lithium-metal since 1979. It was the first company to successfully commercialize the dry lithium-metal polymer rechargeable battery. This achievement has enabled HQ to build strong expertise in various solid-state battery technologies, particularly in lithium anode development.

As such, HQ was invited to join the SolidBat project as a continuation of the previous SafeLiMove project, based on its recognized expertise in solid-state battery technology.

• Which innovative concept will be developed by HQ within SOLIDBAT?

HQ will be responsible for the development of the anodes, leveraging its innovative technology to produce the thinnest lithium metal on a current collector, achievable through roll-to-roll (R2R) processing. Additionally, the surface will be decorated with a precise pattern to accommodate high current densities.

• What are the key advantages of the lithium metal anode?

Thanks to its high specific capacity, its lowest electrode potential among all metals, and its light weight, it becomes ideal for achieving high energy density when combined with high-voltage cathodes.

This combination can improve safety, thermal stability, and cycle life when properly designed. When paired with advanced electrolyte systems and protective layers (e.g., patterned surfaces or coatings), lithium metal anodes can achieve stable cycling and reduced dendrite formation.

• How can HQ’s development contribute to prolonging battery life toward the target of 500 cycles?

The HQ approach, which relies on precise surface structuring, allows for a more uniform current distribution across the anode. This minimizes localized hot spots and mechanical stresses, which can degrade the interface and reduce cycle life.

A well-designed lithium surface, combined with a chemically stable solid electrolyte, promotes the formation of a stable SEI layer, essential for long-term cycling.

• What is the win-win collaboration with EU partners?

The SolidBat project fosters a strategic and mutually beneficial collaboration between HQ and its European partners. This partnership leverages the complementary strengths of each participant to accelerate the development of next-generation solid-state lithium-metal batterie.

HQ gains strategic access to European markets and regulatory frameworks, while EU partners benefit from HQ’s proven technologies.

HQ´s proprietary R2R lithium processing can be integrated into EU manufacturing processes, thereby promoting technology transfer.