Hong Chulgi Nathan, Yan Mengwen, Borodin Oleg, Pollard Travis P, Wu Langyuan, Reiter Manuel, Vazquez Dario Gomez, Trapp Katharina, Yoo Ji Mun, Shpigel Netanel, Feldblyum Jeremy I, Lukatskaya Maria R
Electrochemical Energy Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich Zürich 8092 Switzerland
Department of Chemistry, The University at Albany, State University of New York Albany NY 12222 USA.
Energy Environ Sci. 2024 May 2;17(12):4137-4146. doi: 10.1039/d4ee00296b. eCollection 2024 Jun 18.
Controlling solid electrolyte interphase (SEI) in batteries is crucial for their efficient cycling. Herein, we demonstrate an approach to enable robust battery performance that does not rely on high fractions of fluorinated species in electrolytes, thus substantially decreasing the environmental footprint and cost of high-energy batteries. In this approach, we use very low fractions of readily reducible fluorinated cations in electrolyte (∼0.1 wt%) and employ electrostatic attraction to generate a substantial population of these cations at the anode surface. As a result, we can form a robust fluorine-rich SEI that allows for dendrite-free deposition of dense Li and stable cycling of Li-metal full cells with high-voltage cathodes. Our approach represents a general strategy for delivering desired chemical species to battery anodes through electrostatic attraction while using minute amounts of additive.
控制电池中的固体电解质界面（SEI）对于其高效循环至关重要。在此，我们展示了一种实现强大电池性能的方法，该方法不依赖于电解质中高比例的氟化物种，从而大幅降低了高能电池的环境影响和成本。在这种方法中，我们在电解质中使用极低比例的易于还原的氟化阳离子（约0.1 wt%），并利用静电引力在阳极表面产生大量此类阳离子。结果，我们可以形成一个坚固的富含氟的SEI，它允许致密锂无枝晶沉积，并使具有高压阴极的锂金属全电池实现稳定循环。我们的方法代表了一种通用策略，即通过静电引力在使用微量添加剂的同时将所需化学物种输送到电池阳极。
