Researchers at the University of Cambridge have demonstrated that applying consistent physical pressure to lithium-ion batteries can extend their lifespan by up to twofold, potentially reducing both recycling demands and environmental impacts associated with raw-material extraction. The study, reported in Nature Energy, highlights the importance of mechanical factors in battery longevity alongside traditional chemical and materials engineering approaches.
In the experiments, the team focused on commercially available pouch-cell batteries. They designed a custom testing apparatus that uses pneumatic bellows to maintain steady compression on the cells throughout each charge and discharge cycle. A sensor within the device tracked subtle volume changes in the battery, allowing the system to adjust pressure dynamically and keep it within an optimal range—about 12.5 bar, roughly four times the pressure typically found in coin-cell testing.
According to Professor Michael De Volder, who co-led the research, maintaining this “Goldilocks” pressure is critical. If the pressure is too high, lithium plating can occur on the anode, while too little pressure can lead to cathode cracking. By identifying the range that prevents both failure modes, the researchers achieved battery lifetimes that far exceed the usual 5–10 percent improvements seen through material tweaks.
Extending battery life has significant environmental implications. Fewer battery replacements would mean less end-of-life waste and a reduced need for nickel and cobalt mining, which often involves challenging social and ecological conditions. “The longer your product will last, the fewer times you’ll have to recycle,” De Volder remarked, emphasizing that current recycling rates for batteries remain low.
While these findings are based on laboratory-scale tests, the team has filed a patent through Cambridge Enterprise and is exploring pathways for commercial scaling. Future work will involve adapting this pressure-management approach to larger cell formats and integrating it into battery pack designs for electric vehicles and stationary storage.
