Sodium-ion batteries are considered a promising, sustainable alternative to lithium-ion batteries. Researchers at the Federal Institute for Materials Research and Testing (BAM) have now developed a design for anodes that combines efficiency and high storage capacity. Innovative core-shell design To solve this problem, the BAM team developed an innovative core-shell design for the anode. This preserves the storage capacity of the anode and allows the battery to maintain its performance over many charging cycles. Simultaneous improvement of efficiency and storage capacity The materials developed in the study already achieve an initial efficiency of 82 percent – without coating, it is 18 percent.