Polytetrafluoroethylene (PTFE) is a synthetic fluoropolymer also present in teflon. However, in conventional dry-electrode battery manufacturing, the material acts as a binder for anodes. Recent research reveals how to manufacture PTFE-free, dry electrodes. This begs the question, why would we want to do that?
Why Do Battery Makers Use Polytetrafluoroethylene?
We already know that PTFE holds the particles in electrodes together, without using liquid solvents. The teflon-like material forms tiny fibers during mixing. This normally allows the finished electrode to interface directly with the current collector.
This eliminates both solvent-coating and energy-intensive drying ovens. This in turn reduces manufacturing costs, shortens production times, lowers carbon emissions, and simplifies factory design. The electrode may also be thicker, helping to increase battery energy density.
So Why Do We Need PTFE-Free, Dry Electrodes?
PTFE-free, dry electrodes are an attractive idea, but the material also has its weaknesses. Carefully controlled mixing is essential to produce the right fibrous structure.
Yet at the same time, PTFE is one of the most promising binders for dry-electrode production, because it combines excellent chemical stability with exceptional mechanical strength.
PTFE Has Environmental Disadvantages Too
We know that PTFE is relatively expensive. It is also a fluoropolymer that does not readily break down in the environment. This raises concerns in our minds about long-term sustainability and recycling.
Towards PTFE-Free, Dry Electrodes in Future
Scientists at Korea Institute of Materials Science have teamed with colleagues from Korea Electrotechnology Research Institute. Together, they have developed a shape-controlled graphite granule-based dry anode electrode, that eliminates PTFE.
However, this may not affect the batteries we use regularly. The researchers have their eye on microbial electrochemical technologies, particularly bio-remediation.
Broader Implications for Zero-PTFE Electrodes
We agree with the researchers that this technology has broader implications. We say so because it represents a way to produce PTFE-free, dry electrodes without using polytetrafluoroethylene.
If commercialized, this could extend electric vehicle driving ranges, and reduce charging times for busy drivers in a hurry too.
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