China 

Chinese scientists have developed a high-energy water-based battery with nearly double the energy density of traditional lithium batteries, offering improved safety and potential applications in electric vehicles and grid-scale energy storage. This breakthrough, published in Nature Energy, presents a promising advancement in battery technology.

Chinese scientists have made a significant breakthrough in battery technology, potentially revolutionizing the future of electric vehicles and energy storage systems. According to a recent paper published in Nature Energy by researchers from the Chinese Academy of Sciences (CAS), they have developed a water-based battery with nearly double the energy density of traditional lithium batteries.

The newly developed battery, based on iodine and bromine, boasts an impressive energy density of 1200 watt-hours per litre (Wh/L), compared to the 700Wh/L of conventional non-aqueous lithium batteries. What's more, it offers improved safety features, as aqueous batteries are less flammable than their non-aqueous counterparts.

One of the main challenges with aqueous batteries has been their lower energy density, typically below 200Wh/L, limiting their application to large-scale stationary energy storage. However, the CAS team addressed this issue by devising a new electrolyte formulation that overcame these limitations.

By combining a bromine and iodine-based electrolyte with a cadmium-based anode, the researchers achieved a battery that demonstrated impressive performance over 300 charging and discharging cycles, with 78% energy efficiency. Moreover, when tested with a vanadium anode, the battery showed extended longevity, lasting up to 1000 cycles.

The implications of this advancement are significant. Not only does the water-based battery offer higher energy density and improved safety, but it also presents a viable alternative for grid-scale energy storage and electric vehicles. Additionally, the researchers suggest that the cost of these batteries could be comparable to traditional lithium batteries.

Professor Li Xianfeng, corresponding author of the study, believes that this innovation could expand the applications of aqueous batteries in the power battery field. With their promising results, the team has paved the way for the development of next-generation high-energy-density and safe rechargeable aqueous batteries.

In conclusion, the breakthrough achieved by the CAS researchers represents a significant step forward in battery technology. Their work not only addresses safety concerns associated with lithium batteries but also opens up new possibilities for energy storage and transportation systems in the future.