Tailoring the Mechanical and Electrochemical Properties of an Artificial Interphase for High‐Performance Metallic Lithium Anode,Advanced Energy Materials

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Tailoring the Mechanical and Electrochemical Properties of an Artificial Interphase for High‐Performance Metallic Lithium Anode
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2020-06-10 , DOI: 10.1002/aenm.202001139
Yipeng Sun _{1,

2} , Maedeh Amirmaleki ₃ , Yang Zhao ₁ , Changtai Zhao ₁ , Jianneng Liang ₁ , Changhong Wang ₁ , Keegan R. Adair ₁ , Junjie Li ₁ , Teng Cui ₃ , Guorui Wang ₃ , Ruying Li ₁ , Tobin Filleter ₃ , Mei Cai ₄ , Tsun‐Kong Sham ₂ , Xueliang Sun ₁

Affiliation

Lithium metal is regarded as the “Holy Grail” of anode materials due to its low electrochemical potential and high theoretical capacity. Unfortunately, its unstable solid electrolyte interphase (SEI) leads to low Coulombic efficiency (CE) and serious safety issues. Herein, a hybrid nanoscale polymeric protective film with tunable composition and improved stiffness is developed by incorporating aluminum crosslinkers into the polymer chains. The Li plating/stripping process is regulated through the protective coating and the dendrite growth is effectively suppressed. Promisingly, the protected Li can deliver stable performance for more than 350 h with a cycling capacity of 2 mAh cm⁻² without a notable increase in overpotential. Moreover, a stable charge/discharge cycling in Li–O₂ batteries with the protected Li can be maintained for more than 600 h. This work provides guidance on the rational design of electrode interfaces and opens up new opportunities for the fabrication of next‐generation energy storage systems.

中文翻译：

量身定制高性能金属锂阳极人工界面的机械和电化学性能

锂金属由于其低的电化学势和高的理论容量而被认为是阳极材料的“圣杯”。不幸的是，其不稳定的固体电解质中间相（SEI）导致库仑效率（CE）低和严重的安全问题。本文中，通过将铝交联剂引入聚合物链中，开发了具有可调组成和改善的刚度的杂化纳米级聚合物保护膜。通过保护涂层可以调节锂的电镀/剥离过程，并有效地抑制枝晶的生长。很有可能，受保护的Li可以在超过350小时的时间内提供稳定的性能，循环容量为2 mAh cm ^-2，而不会显着增加过电势。此外，Li–O _2中的充电/放电循环稳定具有受保护锂的电池可以维持600小时以上。这项工作为合理设计电极接口提供了指导，并为制造下一代储能系统开辟了新的机遇。

更新日期：2020-07-28

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