High-voltage lithium (Li)-metal batteries with cell-level energy density over 350 Wh kg⁻¹ are promising energy storage systems. However, the aggressive interphase chemistries associated with highly reactive Li-metal anode and high-voltage cathodes impede their practical applications. Herein, we demonstrate the targeted stabilization of solid electrolyte interphase (SEI) and cathode electrolyte interphase (CEI) in high-voltage Li-metal batteries by asymmetrically sustained-releasing different additives. An asymmetric sustained-release film loaded with lithium bis-(oxalate)borate (LiBOB) and LiNO₃ on each side is investigated as a proof-of-concept. The sustained-releasing of LiBOB and LiNO₃ can maintain a localized concentration at the high-voltage cathode and Li-metal anode fronts respectively, thus forming a stable B-containing CEI and N-containing SEI. As such, issues like dendrites growth, parasitic side reactions and transition metals dissolution under high-voltage are addressed simultaneously. Based on this strategy, the 30 μm Li|LiNi_0.5Co_0.2Mn_0.3O₂ (4.1 mAh cm⁻²) batteries deliver a capacity retention of 80% after 173 cycles under a cut-off voltage of 4.5 V.

^{电池级能量密度超过350 Wh kg -1}的高压锂（Li）金属电池是很有前途的储能系统。然而，与高反应性锂金属负极和高压正极相关的侵蚀性界面化学阻碍了它们的实际应用。在此，我们展示了通过不对称缓释不同添加剂对高压锂金属电池中的固体电解质界面 (SEI) 和正极电解质界面 (CEI) 进行定向稳定。作为概念验证，研究了一种不对称缓释薄膜，其每侧均载有双（草酸）硼酸锂 (LiBOB) 和 LiNO _{3 。LiBOB和LiNO 3}的持续释放可以分别在高压正极和锂金属负极前沿保持局部浓度，从而形成稳定的含B CEI和含N SEI。因此，同时解决了高压下的枝晶生长、寄生副反应和过渡金属溶解等问题。基于此策略，30 μm Li|LiNi _0.5 Co _0.2 Mn _0.3 O ₂ (4.1 mAh cm ^-2 ) 电池在 4.5 V 截止电压下循环 173 次后容量保持率为 80%。