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In the end, the cathode of the sodium-ion battery has a reversible capacity of 484 mAh g−1, and an energy density of 726 Wh kg−1. The energy efficiency of the new batteries is claimed to be more than 87 percent, and as for the all-important factor of cost, the researchers claim this could add up to a sodium-ion battery that approaches lithium-ion batteries in terms of performance, but would cost less then 80 percent of a lithium-ion battery with equivalent storage capacity.The next steps for the team is to fiddle with the phosphorus anode, which should squeeze more performance out of the sodium-ion battery. To properly compare their creation to lithium-ion batteries, the team also plans to examine the volumetric energy density of the device, which dictates how big a battery needs to be to store a certain amount of energy.