Fluorinated hybrid solid-electrolyte-interphase for dendrite-free lithium deposition

Rajesh Pathak, Ke Chen, Ashim Gurung, Khan Mamun Reza, Behzad Bahrami, Jyotshna Pokharel, Abiral Baniya, Wei He, Fan Wu, Yue Zhou (), Kang Xu () and Qiquan (Quinn) Qiao ()
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Rajesh Pathak: South Dakota State University
Ke Chen: South Dakota State University
Ashim Gurung: South Dakota State University
Khan Mamun Reza: South Dakota State University
Behzad Bahrami: South Dakota State University
Jyotshna Pokharel: South Dakota State University
Abiral Baniya: South Dakota State University
Wei He: South Dakota State University
Fan Wu: South Dakota State University
Yue Zhou: South Dakota State University
Kang Xu: Electrochemistry Branch, Sensor and Electron Devices Directorate, Power and Energy Division, U.S. Army Research Laboratory
Qiquan (Quinn) Qiao: South Dakota State University

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: Abstract Lithium metal anodes have attracted extensive attention owing to their high theoretical specific capacity. However, the notorious reactivity of lithium prevents their practical applications, as evidenced by the undesired lithium dendrite growth and unstable solid electrolyte interphase formation. Here, we develop a facile, cost-effective and one-step approach to create an artificial lithium metal/electrolyte interphase by treating the lithium anode with a tin-containing electrolyte. As a result, an artificial solid electrolyte interphase composed of lithium fluoride, tin, and the tin-lithium alloy is formed, which not only ensures fast lithium-ion diffusion and suppresses lithium dendrite growth but also brings a synergistic effect of storing lithium via a reversible tin-lithium alloy formation and enabling lithium plating underneath it. With such an artificial solid electrolyte interphase, lithium symmetrical cells show outstanding plating/stripping cycles, and the full cell exhibits remarkably better cycling stability and capacity retention as well as capacity utilization at high rates compared to bare lithium.

Date: 2020
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DOI: 10.1038/s41467-019-13774-2

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