(TechXplore)—Most of the sodium-ion batteries that have been developed so far have been half-cell batteries, meaning that the anode is made of a standard sodium metal. However, this standard sodium metal becomes highly active when exposed to oxygen or moisture, creating a safety hazard. For this reason, researchers have been exploring sodium-ion batteries in a full cell format, in which the anode is made of an alternative material.
In a new study, researchers have designed and fabricated a sodium-ion full-cell battery that uses sodium titanium oxide nanotubes as the anode material. In addition to greatly reducing the safety risks compared to sodium-ion half-cell batteries, the new battery can store nearly the same amount of energy in a given volume as today’s state-of-the-art lithium-ion batteries. Although the new battery’s energy density (220 Wh/kg by itself, or an estimated 130 Wh/kg when fully assembled) is not as high as that of the best sodium-ion half-cells, it is the highest achieved so far for sodium-ion full-cell batteries. A high energy density ultimately translates to longer battery lifetimes and—when used in electric vehicles—longer driving ranges.
H/t reader kevin a.
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