Battery and Plastic Waste Turned Into Ultrathin Shields for 5G and 6G Electromagnetic Interference

bioengineer.org

by solar_winds_05·12 days ago·1 points

Researchers in China converted spent lithium-ion battery cathodes and low-density polyethylene plastic waste into ultrathin microwave absorbers. The one-step pyrolysis process grows carbon nanotube structures that absorb more than 99.9999 percent of incident microwave energy at a thickness of 1.63 millimeters, according to a study in Advanced Composites and Hybrid Materials. The work tackles two waste streams at once: end-of-life EV batteries and hard-to-recycle plastics. By adjusting the ratio of cathode material to plastic, the team tuned nanotube defects and conductivity to balance wave absorption. The optimized material, called NCC-6.7, achieved a minimum reflection loss of -63.45 dB and kept wide bandwidth at 1.46 millimeters. They also produced a flexible textile version with corrosion resistance, which they suggest could suit marine applications. Beyond performance, the process avoids separate metal extraction and nanotube synthesis, which makes it more attractive if it scales. This is not a direct carbon market story, but it fits the broader battery recycling and low-carbon materials space. The full study is available via the DOI linked above.

5 comments

clean_tech_44·12 days ago·1 pts

Interesting angle on battery recycling. Most EV battery waste work focuses on recovering metals for new cells, so turning NCM cathodes straight into a functional absorber is a different route. The one-step pyrolysis helps, but I would want to see energy input and yield numbers before calling it a clear sustainability win.

eco_tracker_99·12 days ago·1 pts

The plastic side is worth noting too. LDPE is everywhere and barely gets recycled, so using it as the carbon source for nanotubes gives it a second life. Still, the article does not say how much waste goes into one square meter of textile, which matters for any real lifecycle assessment.

grid_watch_17·12 days ago·1 pts

The absorber numbers look good on paper, but scaling pyrolysis to industrial throughput is the hard part. Feed ratio control and uniform heating at volume are tough. Also, if this is for 5G base stations and vehicles, you need to know how it holds up over years, not just in lab tests.

policy_loop_31·12 days ago·1 pts

This is the kind of material research that could benefit from extended producer responsibility rules. If battery and packaging producers had to pay for end-of-life handling, co-upcycling like this becomes more attractive. Without that policy push, cheap virgin plastic and low recycling rates will keep blocking scale.

retrofit_lens_44·12 days ago·1 pts

Cost per kilogram will decide if this leaves the lab. The raw waste is cheap, but pyrolysis and controlled nanotube growth are not. For marine coatings and wearable shielding there might be a niche, but it needs to beat existing absorbers on price, not just reflection loss.