Graphene-enhanced binder-free cathode formulation for next generation lithium ion batteries (GraFREE)
| Reference number | |
| Coordinator | RISE Research Institutes of Sweden AB |
| Funding from Vinnova | SEK 300 000 |
| Project duration | August 2021 - April 2022 |
| Status | Completed |
| Venture | Strategic innovation program SIO Grafen |
| Call | Feasibility studies SIO Grafen spring 2021 - collaboration on commercial graphene applications |
Important results from the project
The aim has been to develop a binder-free electrode for more sustainable lithium-ion battery applications by combining Aros® graphene, lithium iron phosphate (LFP) and binders.
Expected long term effects
A free-standing film containing functionalized graphene (Aros® graphene),LFP, cross-linker and plasticizer has been developed. Thus, both the fluoropolymer (PVDF) and the toxic organic solvent (NMP) were eliminated from the traditional slurry-based electrode manufacturing process. However, further optimization of the mechanical and electrochemical properties of the film is needed.
Approach and implementation
In this project several possible ways forward were literature researched and assessed; Of these 4 different “best” candidates were chosen to be tested in the project as binder-free, waterborne, graphene-enhanced cathode formulation. We used a common cathode active material, LFP as the model system. After some tweaking and formulation screening, it was found that it is possible to use graphene as a binder for LFP cathodes. Also, in some cases, we were able to achieve the “binding effect” using lower than 3% of graphene loads and casting films from waterborne dispersions.