TECH – Researchers at KAIST have found a clever way to make water-based zinc batteries store more energy by putting protons, long considered a nuisance in battery chemistry, to actual use. According to Interesting Engineering, the team designed a new electrode that lets protons contribute to energy storage instead of just causing problems, potentially solving one of the trickiest trade-offs in battery design: getting high storage capacity and fast charging to coexist.
The breakthrough centers on a two-dimensional conductive metal-organic framework, a porous material built by linking metal components with organic molecules. Scientists modified its tiny pores with amine groups, essentially giving the material a gatekeeping mechanism that controls exactly when different ions are allowed to enter. Zinc ions move in first, arriving at higher voltages, while much smaller protons wait their turn and slip in later as the voltage drops. That sequencing is the whole trick, since it lets the electrode benefit from both charge carriers without proton reactions messing with zinc-ion storage.
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Aqueous zinc-ion batteries already have real advantages over conventional designs, namely lower fire risk and lower costs, since they rely on water-based electrolytes rather than flammable ones. Their weakness has always been speed: zinc ions are relatively slow-moving, making it hard to combine strong energy storage with rapid charging. Protons move much faster but tend to leave behind byproducts that clog the electrode and hurt performance, which is exactly why they earned their troublesome reputation in the first place.
The researchers compare their approach to packing a bottle with large pebbles before pouring in fine sand, letting zinc ions claim space first and protons fill in what’s left. In testing, the electrode hit a storage capacity of 368.7 mAh per gram and held up through more than 500 rapid charge-discharge cycles, retaining nearly half its capacity even when charging speed was cranked up sixteen-fold.
Professor Sarah S. Park of KAIST explained the shift in thinking behind the work: “This study demonstrates that protons, previously regarded as ‘troublemakers’ that could degrade battery performance, can instead be used to store more energy.” She added that applying the same principle to other electrode materials could pave the way for batteries that charge quickly while holding far more energy, a combination that has eluded much of the field until now. The findings were published in the journal Chem.
