"An ultrathin ionomer interphase for high efficiency lithium anode in carbonate based electrolyte"

Yu-Ting Weng: Hao-Wen Liu, Allen Pei, FeiFei Shi, Hansen Wang, Chih-Yuan Lin, Sheng-Siang Huang, Lin-Ya Su, Jyh-Ping Hsu, Chia-Chen Fang, Yi Cui & Nae-Lih Wu; Nature Communications, 12/20/19.

Additional Authors: Hao-Wen Liu, Allen Pei, FeiFei Shi, Hansen Wang, Chih-Yuan Lin, Sheng-Siang Huang, Lin-Ya Su, Jyh-Ping Hsu, Chia-Chen Fang, Yi Cui & Nae-Lih Wu

Abstract:

High coulombic efficiency and dendrite suppression in carbonate electrolytes remain challenges to the development of high-energy lithium ion batteries containing lithium metal anodes. Here we demonstrate an ultrathin (≤100 nm) lithium-ion ionomer membrane consisting of lithium-exchanged sulfonated polyether ether ketone embedded with polyhedral oligosilsesquioxane as a coating layer on copper or lithium for achieving efficient and stable lithium plating-stripping cycles in a carbonate-based electrolyte. Operando analyses and theoretical simulation reveal the remarkable ability of the ionomer coating to enable electric field homogenization over a considerably large lithium-plating surface. The membrane coating, serving as an artificial solid-electrolyte interphase filter in minimizing parasitic reactions at the electrolyte-electrode interface, enables dendrite-free lithium plating on copper with outstanding coulombic efficiencies at room and elevated (50 °C) temperatures. The membrane coated copper demonstrates itself as a promising current collector for manufacturing high-quality pre-plated lithium thin-film anode.