"Polymer Nanofiber-Guided Uniform Lithium Deposition for Battery Electrodes"

Zheng Liang : Guangyuan Zheng, Chong Liu, Nian Liu, Weiyang Li, Kai Yan, Hongbin Yao, Po-Chun Hsu, Steven Chu and Yi Cui,; Nano Letters, 03/30/15.

Additional Authors: Guangyuan Zheng, Chong Liu, Nian Liu, Weiyang Li, Kai Yan, Hongbin Yao, Po-Chun Hsu, Steven Chu and Yi Cui,

Abstract:

Lithium metal is one of the most promising candidates as an anode material for next-generation energy storage systems due to its highest specific capacity (3860 mAh/ g) and lowest redox potential of all. The uncontrolled lithium dendrite growth that causes a poor cycling performance and serious safety hazards, however, presents a significant challenge for the realization of lithium metal-based batteries. Here, we demonstrate a novel electrode design by placing a three dimensional (3D) oxidized polyacrylonitrile nanofiber network on top of the current collector. The polymer fiber with polar surface functional groups could guide the lithium ions to form uniform lithium metal deposits confined on the polymer fiber surface and in the 3D polymer layer. We showed stable cycling of lithium metal anode with an average Coulombic efficiency of 97.4% over 120 cycles in ether-based electrolyte at a current density of 3 mA/cm2 for a total of 1 mAh/cm2 of lithium.