Spherical Lithium Deposition Enables High Li‐Utilization Rate, Low Negative/Positive Ratio, and High Energy Density in Lithium Metal Batteries

Lithium metal battery promises an attractively high energy density. A Li-utilization rate of Li anode is the prerequisite for density and avoiding a huge waste resource. However, dendritic deposition gives rise to “dead Li” parasitic interfacial reactions, resulting in low utilization rate. Herein, regulated spherical by designing MXene host with egg-box structure, suitable curvature, continuous gradient lithiophilic structure. Because greatly reduces side reactions avoids formation dead Li, affords plating/stripping efficiency. Furthermore, design results bottom-up growth within host, safely away from separator. Thus, realizes long life >3000 h >90%, stable cycling full cells at areal capacity up 5 mAh cm−2 negative/positive ratio 0.8, which critical Such highlights role morphological control alkali metals provides viable method build practical high-energy batteries.