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Lin, Liangdong; Qin, Kun; Hu, Yong‐sheng; Li, Hong; Huang, Xuejie; Suo, Liumin; Chen, Liquan
Advanced materials (Weinheim), 06/2022, Letnik: 34, Številka: 23Journal Article
Volumetric energy density is a critical but easily neglected index of lithium‐metal batteries (LMBs). Compared with gravimetric energy density, the volumetric energy density (VED) of LMBs is much more sensitive to the anode/cathode (A/C) ratio due to the low density of lithium (Li) metal and the volume expansion of the Li‐metal anode owing to its pulverization during cycles. Anode‐free LMBs (AF‐LMBs) have high theoretical VED due to the absence of an anode and high retention with relatively low cell expansion. Because Li plating highly depends on the mother substrate, Li plating on copper (Cu) substrates is more reversible and denser than that on Li substrates during cycling, which is beneficial for maintaining high volumetric capacity and efficient Li utilization. Therefore, considering that excess Li must be strictly limited to achieve competitive energy density, AF‐LMBs (with bare Cu foil as the anode current collector) for high‐volumetric‐density batteries are recommended. The density of Li metal is low, so the abuse of Li foil in Li‐metal batteries (LMBs) can easily lead to the loss of their advantage in volumetric energy density over Li‐ion batteries. In addition, Li plating on a Li substrate is not as dense as that on a Cu substrate. Therefore, anode‐free LMBs are more worthy of recommendation.
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