The creation of Li metal anodes while minimizing dendrite growth is an important challenge for developing high-energy density batteries. Dendrites can originate from an inhomogeneous charge distribution or an irregular substrate, and often, the way to suppress dendrite growth is to avoid their formation altogether (ion-uniform mechanism over a shelf time). Herein, we propose a different route to eliminate dendrite formation, called an asymmetrical bidirectional current mode (ABCM) of charging, leading to a healable Li metal anode and resulting in a positive feedback cycle. This mode allows for a stable cyclic performance and suppresses dendrite formation effectively (while holding the polarization ∼27 mV for over 1,000 h), and provides a better result than suppressing Li dendrites via weakening of the Li dendrite (ion-uniform mechanism). These results indicate that ABCM may be a promising way to stabilize the Li anode of Li metal batteries, without any chemical/physical modification of the anode.

在开发锂金属阳极的同时最大程度地减少树枝状晶体的生长是开发高能量密度电池的一项重要挑战。枝晶可以源自不均匀的电荷分布或不规则的基质，通常，抑制枝晶生长的方法是完全避免枝晶的形成（在货架时间内离子均匀的机制）。本文中，我们提出了另一种消除树枝状晶体形成的途径，称为充电的不对称双向电流模式（ABCM），导致可修复的锂金属阳极并导致正反馈周期。此模式可提供稳定的循环性能，并有效抑制枝晶形成（同时保持极化〜27 mV超过1000小时），与通过削弱锂枝晶（离子均匀机制）抑制锂枝晶相比，可提供更好的结果。