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 () and Nae-Lih Wu ()
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Yu-Ting Weng: National Taiwan University
Hao-Wen Liu: National Taiwan University
Allen Pei: Stanford University
FeiFei Shi: Stanford University
Hansen Wang: Stanford University
Chih-Yuan Lin: National Taiwan University
Sheng-Siang Huang: National Taiwan University
Lin-Ya Su: National Taiwan University
Jyh-Ping Hsu: National Taiwan University
Chia-Chen Fang: Industrial Technology Research Institute
Yi Cui: Stanford University
Nae-Lih Wu: National Taiwan University

Nature Communications, 2019, vol. 10, issue 1, 1-10

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-13783-1

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