The efficient utilization of metallic lithium (Li) is the key to enable application of Li metal full-cell with low amount of excess Li, contributing to higher safety and energy density. Herein, we report an extraordinary Li metal full-cell with only 20% excess Li, which demonstrated significantly improved reversibility and high Coulombic efficiency. Ingenious simulated missile guidance and confinement system (SMGCS) was designed to guide and confine Li deposition through constructing compatible silver lithiophilic sites and nitrate layer. Silver sites act as effective Li nuclei to attract Li ions and direct the initial nucleation. The generated nitrate layer affords an interfacial environment favorable for confined and uniform deep Li deposition, which is theoretically verified by molecular dynamics (MD) simulations. The two combined merits offer a robust and dendrite-free Li deposition, enabling the application of Li metal full-cell with slight excess Li. They also result in an outperformed Li cycling efficiency of ca. 99% for over 300 cycles along with deep cycling at a high capacity of 10 mA h cm⁻² in carbonate electrolytes. The unprecedented high degree of Li utilization opens a new avenue for the future development of highly efficient Li metal full cells.

有效利用金属锂（Li）是实现使用少量过量Li的Li金属全电池的关键，这有助于提高安全性和能量密度。本文中，我们报道了一种非常规的锂金属全电池，其中仅含过量20％的锂，这表明其可逆性和库仑效率都得到了显着提高。设计巧妙的模拟导弹制导和限制系统（SMGCS），通过构建相容的银亲硫银位点和硝酸盐层来引导和限制Li的沉积。银位点充当有效的Li核，以吸引Li离子并指导初始成核。生成的硝酸盐层提供了一个有利于有限且均匀的深锂沉积的界面环境，这在理论上已通过分子动力学（MD）模拟得到了验证。这两个优点相结合，可提供坚固而无枝晶的Li沉积，从而使Li金属全电池中的Li含量略有增加。它们还导致Li的循环效率优于Ca。99％可以进行300多个循环，并以10 mA h cm的高容量进行深度循环在碳酸盐电解质中为^-2。前所未有的高Li利用率为高效Li金属满电池的未来发展开辟了一条新途径。