CELLulose nanocomposite separators for the nEXt generation of smart batteries

Introduction

As the popularity of electric vehicles continues to increase, so does the number of batteries reaching the end-of-life that are used to power them. It is expected that by 2030, this will reach 2 million tons worldwide.

Challenges in Battery Production

On top of this, the complexity of battery production results in very high scrap rates (about 10%-30%), especially during production ramp-up. Additionally, the scarcity of raw materials in Europe is intensifying EU regulations to localize supply chains and safeguard critical raw materials.

Need for Sustainability

It is evident that there is a strong need to increase sustainability in the battery value chain. Contributions may come from improving both the lifetime and recyclability of the cell components.

Project Overview

In EXCELL, it is proposed to prove a new concept for battery separators based on a 100% natural cellulose nanocomposite with tunable mesopores obtained by a mixture of nanofibers and cellulose nanocrystals.

Incorporation of Sensing Elements

Additionally, these new separators will be suitable for the incorporation of sensing elements that will enable the new generation of smart battery cells.

Previous Research

EXCELL will follow the outputs of NEWFUN-StG, where it was demonstrated that cellulose-based ionic conductive materials can be recycled and reused while maintaining electrochemical performance. The PIs team has also demonstrated that cellulose nanocrystals can create mesoporous ionic conductive channels that can be tuned to specific alkali ions through proper functionalization of the crystal surface.

Synergic Effect

EXCELL will now demonstrate the synergic effect of combining both to form hierarchical mesoporous membranes exhibiting a unique set of characteristics that can meet those expected for an ideal separator.

Implementation Strategy

EXCELL will follow an approach of validating the new separator concept and then implement an IPR consolidation and a business case to attract the attention of battery market stakeholders on new opportunities for cell components based on abundant natural resources that are recyclable and biodegradable.