Chemically Induced Activity Recovery of Isolated Lithium in Anode-free Lithium Metal Batteries,Nano Letters

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Chemically Induced Activity Recovery of Isolated Lithium in Anode-free Lithium Metal Batteries
Nano Letters ( IF 9.6 ) Pub Date : 2022-11-22 , DOI: 10.1021/acs.nanolett.2c02508
Chengwei Ma ₁ , Suting Weng _{2,

3} , Yuanxing Zhang ₁ , Xinyu Zhang ₁ , Tao Liu ₁ , Ling Liu ₁ , Zhiguang Zhao ₁ , Chengcai Liu ₁ , Zhikun Zhao ₁ , Xuefeng Wang _{2,

3,

4} , Borong Wu _{1,

5} , Daobin Mu ₁ , Feng Wu ₁

Affiliation

The anode-free lithium metal battery is considered to be an excellent candidate for the new generation energy storage system because of its higher energy density and safety than the traditional lithium metal battery. However, the continuous generation of SEI or isolated Li hinders its practical application. In general, the isolated Li is considered electrochemically inactive because it loses electrical connection with the current collector. Here we show an abnormal phenomenon that the lost capacity appears to be recovered after cycles when the isolated Li reconnects with a deposited Li metal layer. The isolated Li reconnection is ascribed to the chemical induction of the block copolymer coating. The migration of Li⁺ is affected by the electron delocalization and the electron cloud density of the polymer, which determine the conversion direction of Li⁺. Based on the mechanism, we propose a strategy to slow down the capacity decay of the anode-free lithium metal battery.

中文翻译：

无阳极锂金属电池中离析锂的化学诱导活性恢复

无负极锂金属电池因其比传统锂金属电池更高的能量密度和安全性，被认为是新一代储能系统的极佳候选者。然而，连续产生SEI或孤立的Li阻碍了它的实际应用。通常，孤立的 Li 被认为是电化学惰性的，因为它失去了与集电器的电连接。在这里，我们展示了一种异常现象，即当孤立的 Li 与沉积的 Li 金属层重新连接时，损失的容量似乎在循环后恢复。孤立的 Li 重新连接归因于嵌段共聚物涂层的化学感应。^{Li +}的迁移受聚合物的电子离域和电子云密度的影响，决定了Li ⁺的转化方向。基于该机制，我们提出了一种减缓无负极锂金属电池容量衰减的策略。

更新日期：2022-11-22

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