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Deciphering the Effect of Electrical Conductivity of Hosts on Lithium Deposition in Composite Lithium Metal Anodes
Advanced Energy Materials ( IF 27.8 ) Pub Date : 2021-08-11 , DOI: 10.1002/aenm.202101654
Ying‐Xin Zhan 1, 2 , Peng Shi 3 , Rui Zhang 1, 2 , Xue‐Qiang Zhang 1, 2 , Xin Shen 3 , Cheng‐Bin Jin 3 , Bo‐Quan Li 1, 2 , Jia‐Qi Huang 1, 2
Affiliation  

Lithium metal anodes demonstrate inferior cycling stability due to uncontrolled Li deposition and large volume fluctuation. Composite Li metal anodes with a 3D host show stable Li deposition. Nevertheless, the advantages of a host are achieved by the joint effect of various parameters. The effect of a single parameter of a host on Li deposition is veiled, hindering the rational design of a host. Herein, a decoupling method is demonstrated to decipher the effect of host electrical conductivity, a vital parameter, on the behaviors of Li deposition. In order to decouple the effect of host electrical conductivity, a conductive host is modulated by in situ formation of a polymer coating while maintaining the other parameters unchanged. The host electrical conductivity dictates the distribution of electric potential in the vicinity of the host, then the transport of Li ions, and finally behaviors of Li deposition. The cycling performance of the host with high electrical conductivity outperforms that with low electrical conductivity. This work initiates a decoupling methodology to probe the effect of host properties on the behaviors of Li deposition, and provides guidance for the rational design of Li metal anode host materials.

中文翻译:

解读主体的电导率对复合锂金属阳极中锂沉积的影响

由于不受控制的锂沉积和大的体积波动,锂金属负极表现出较差的循环稳定性。具有 3D 主体的复合锂金属负极显示出稳定的锂沉积。然而,主机的优势是通过各种参数的共同作用来实现的。主体的单一参数对锂沉积的影响是隐藏的,阻碍了主体的合理设计。在此,展示了一种去耦方法来解读主体电导率(一个重要参数)对锂沉积行为的影响。为了消除主体电导率的影响,通过原位形成聚合物涂层来调节导电主体,同时保持其他参数不变。宿主电导率决定了宿主附近的电势分布,然后是锂离子的传输,最后是锂沉积的行为。具有高导电性的主体的循环性能优于具有低导电性的主体。这项工作启动了一种去耦方法来探讨主体性质对锂沉积行为的影响,并为锂金属负极主体材料的合理设计提供指导。
更新日期:2021-10-06
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