The State Key Lab of New Ceramic and Fine Processing, School of Materials Science and Engineering, Tsinghua University , Beijing 100084, China.
School of Materials Science and Engineering, University of Science and Technology Beijing , Beijing 100084, China.
ACS Appl Mater Interfaces. 2017 Mar 29;9(12):10360-10365. doi: 10.1021/acsami.7b00181. Epub 2017 Mar 16.
The lithium dendrite growth and low Coulombic efficiency (CE) during lithium plating/striping cycles are the main obstacles for practical applications of lithium metal anode. Herein, we demonstrate that polyacrylonitrile (PAN) submicron fiber array could guide the lithium ions to uniformly disperse and deposit onto current collector. The PAN submicron fiber array nearly does not increase the volume of electrode with ultralow mass. By this simple design, we achieved stable cycling of lithium metal anode with an average CE of ∼97.4% for 250 cycles at a current density of 1 mA cm with total Li capacity of 1 mAh cm.
锂枝晶生长和低库仑效率（CE）在锂电镀/剥离循环过程中是限制金属锂阳极实际应用的主要障碍。在此，我们证明聚丙烯腈（PAN）亚微米纤维阵列可以引导锂离子均匀分散并沉积在集流器上。PAN 亚微米纤维阵列几乎不会增加电极的体积，同时质量极低。通过这种简单的设计，我们实现了金属锂阳极的稳定循环，在电流密度为 1 mA cm 时，总 Li 容量为 1 mAh cm 的情况下，经过 250 次循环后，平均 CE 约为 97.4%。
