- Chinese scientists have developed a water battery that can reliably survive 120,000 charging cycles
- Neutral electrolytes prevent the corrosion that usually destroys aqueous batteries over time.
- The battery would last for centuries under normal grid storage conditions.
Scientists from the City University of Hong Kong and the Southern University of Science and Technology have developed a new type of water-based battery that could last hundreds of years without losing its capacity over time.
Published in Natural communicationsThe device uses synthesized covalent organic polymers as an anode for magnesium and calcium ions instead of traditional battery materials.
Researchers discovered a specific compound that combines high-density carbonyl with a rigid honeycomb structure that resists corrosion, and this design allows the battery to withstand up to 120,000 charge cycles, more than ten times longer than conventional lithium-ion storage batteries.
Water batteries are not easy to perfect
Aqueous batteries have historically offered safety advantages over lithium-ion because they are non-flammable and have lower upfront costs.
However, they generally store less energy and break down over time due to electrolyte breakdown which corrodes their metal components.
The water-based electrolyte in conventional designs often becomes extremely acidic or alkaline, gradually destroying the battery from the inside.
Organic polymers rarely work well under these conditions because they break down quickly when exposed to such harsh chemical environments.
The new design uses a neutral electrolyte with a pH of exactly 7.0, eliminating the extreme conditions that normally cause corrosion.
The specific compound used in the device, called hexacetone tetraaminodibenzo-p-dioxin, maintains a flat, stable honeycomb-like structure throughout the life of the battery.
This structural stability avoids the gradual reduction in capacity that smartphone users are all too familiar with with their aging devices.
The scientists calculated that with current grid storage usage rates of 1.1 cycles per day, their battery could operate for around 300 years before needing replacement.
Most importantly, the electrolytes used in this new design are completely non-toxic and can be safely disposed of directly into the environment.
The research team even noted that the electrolyte solution is so harmless that it could be used as a tofu brine for home cooking without any health risks.
Trade barriers remain
The battery still faces the same fundamental limitation as all water devices, namely lower energy density than lithium-ion systems.
A battery that lasts three centuries but takes up twice as much space may still struggle to achieve commercial adoption in environments where space is limited.
The cost of manufacturing specialized organic polymers also remains uncertain, and large-scale production could reveal unexpected economic hurdles.
Grid storage operators care about lifespan and security, but they also care about dollars per kilowatt hour delivered over the life of the facility.
A 300-year-old battery is only useful if the utility company still exists in 300 years, and the economy needs to function for the next decade, not just the next century.
The absence of toxic materials is a real step forward, but it is the market that will decide whether the compromises make sense.
Scientists have probably solved a chemistry problem, but the commercialization problem is only just beginning.
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