"The 3D anode that we develop at SINTEF is a zinc/biopolymer composite electrode manufactured through a cold sintering process"

30 January 2025

In the HIPERZAB project, we are working towards next-generation electrically rechargeable zinc-air batteries (ERZAB) by improving their key components. One of the most critical elements is the 3D composite anode, which plays a fundamental role in battery performance and longevity. To learn more about this innovative approach, we spoke with Sara Andrenacci, WP3 leader from SINTEF. She shares insights on the development process, the advantages of integrating biopolymer matrices, and how this technology addresses key challenges in zinc-air battery anodes.

 

  • What are the main characteristics of the 3D anode development?

The 3D anode that we develop at SINTEF is a zinc/biopolymer composite electrode manufactured through a cold sintering process. This is an energy- and cost-effective method for fabrication of zinc electrodes with high porosity (>50%). The composite electrode is achieved by addition of the biopolymer, selected by CIC energiGUNE as the alkaline layer of the gel polymer electrolyte, during the sintering process.

 

  • What are the key advantages of the composite anode?

The integration of the biopolymer matrix within the highly porous cold-sintered anode promotes the formation of an optimal ionic conductive network that maximizes zinc utilization. Moreover, the composite electrode overcomes some of the typical challenges encountered by the anode of an electrically rechargeable zinc-air battery (ERZAB).  The electrode interface with a gel polymer electrolyte, in contrast to a fully liquid one, suppresses zinc corrosion by the parasitic hydrogen evolution reaction (HER), shape change, dendrite formation and loss of active mass by diffusion into the bulk electrolyte.


The development of highly porous zinc/biopolymer composite anodes is a significant step forward in advancing ERZAB technology. By improving ionic conductivity, minimizing zinc corrosion, and optimizing zinc utilization, this innovation contributes to the long-term stability and efficiency of next-generation zinc-air batteries. The work carried out in HIPERZAB not only enhances the performance of rechargeable zinc-air batteries but also strengthens their potential for widespread adoption in energy storage solutions.

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