GEN1 Materials of WP3 electrochemically tested
The overarching goal of the NEXTCELL project is to deliver a new generation of 3b lithium-ion battery (LIB) cells designed for high energy density applications—encompassing both high capacity and high voltage. This is achieved through the development and validation of a breakthrough fully gelled cell concept. The innovation lies in the integration of advanced materials across all major cell components, with a particular focus on the gellification of the electrodes and separator. Combined with a high-voltage-stable gel electrolyte, these advancements enable the realization of the full gel cell architecture.
Milestone 30 marks the successful completion of the electrochemical testing tasks outlined in the project work plan. The main objective was to assess the electrochemical performance of the cell material components developed in WP3 at the half-cell level, providing valuable feedback for further material development and electrode processing. The work was carried out in collaboration by CEA, CICe, and POLITO, with each contributing its unique expertise and methodologies. CEA conducted comprehensive testing for material selection, ensuring optimal performance and identifying the ideal conditions for the solventless electrode preparation process. CICe focused on characterizing the cathodes using a reference electrolyte (LPX), performing C-rate capability and cycling stability tests to assess the jellified electrode stability after six months of storage in an inert environment. POLITO and CEA carried out the characterization of both electrode materials against unprotected metallic lithium using novel electrolyte formulations with additives that ensure compatibility at the electrode/electrolyte interface and are compatible with the solventless process for electrode manufacture. This included continuous charge/discharge cycles at various C-rates, cycling stability, cyclic voltammetry at different sweep rates, and finally GITT measurements. These additional tests provided valuable insights into ionic transport, voltage operation range, and electrochemical properties.
The results from these investigations offered critical information about the performance and stability of the materials and electrolytes under various operational conditions. This comprehensive approach not only guided material development within WP3 but also ensured alignment with the project’s goal of creating sustainable, high-performance gelled systems. The next phase will involve integrating all the tested materials into full-cell configurations, bringing the project closer to delivering a final device that closely resembles the product intended for end-user applications.
