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      Elaborate interface design of CoS2/Fe7S8/NG heterojunctions modified on a polypropylene separator for efficient lithium-sulfur batteries

      , , , ,
      Chemical Engineering Journal
      Elsevier BV

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          Mechanism and Kinetics of Li2S Precipitation in Lithium-Sulfur Batteries.

          The kinetics of Li2 S electrodeposition onto carbon in lithium-sulfur batteries are characterized. Electrodeposition is found to be dominated by a 2D nucleation and growth process with rate constants that depend strongly on the electrolyte solvent. Nucleation is found to require a greater overpotential than growth, which results in a morphology that is dependent on the discharge rate.
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            Garnet-Type Solid-State Electrolytes: Materials, Interfaces, and Batteries

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              An artificial hybrid interphase for an ultrahigh-rate and practical lithium metal anode

              The present work theoretically and experimentally provides an insight into the internal mechanism of Li + transport within an artificial hybrid SEI layer consisting of lithium-antimony (Li 3 Sb) alloy and lithium fluoride (LiF). The solid electrolyte interphase (SEI) layer is pivotal for stable lithium (Li) metal batteries especially under a high rate. However, the mechanism of Li + transport through the SEI has not been clearly elucidated to build robust Li anodes for practical Li metal batteries. Herein, an artificial hybrid SEI layer consisting of lithium-antimony (Li 3 Sb) alloy and lithium fluoride (LiF) is constructed to explore the ion diffusion behaviors within the SEI. As evidenced theoretically and experimentally, Li 3 Sb is identified as a superionic conductor for Li + transport and as an interfacial stabilizer for the SEI layer while the LiF component with superior electron-blocking capability reduces the electron tunneling from the Li anode into the SEI, resulting in uniform dendrite-free Li deposition at the SEI/Li interface and stable Li plating/stripping behaviors at an ultrahigh rate of 20 mA cm −2 . A practical 325.28 W h kg −1 pouch cell is well demonstrated under a high sulfur loading of 6 mg cm −2 and a low electrolyte/sulfur ratio of 3 μl mg −1 . This work uncovers the internal mechanism of Li + transport within the SEI component, and provides an avenue to stabilize the Li anode under practical high-rate conditions.
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                Author and article information

                Journal
                Chemical Engineering Journal
                Chemical Engineering Journal
                Elsevier BV
                13858947
                October 2022
                October 2022
                : 446
                : 136990
                Article
                10.1016/j.cej.2022.136990
                9e0cf791-4128-4746-b606-8a40636d0dd7
                © 2022

                https://www.elsevier.com/tdm/userlicense/1.0/

                https://doi.org/10.15223/policy-017

                https://doi.org/10.15223/policy-037

                https://doi.org/10.15223/policy-012

                https://doi.org/10.15223/policy-029

                https://doi.org/10.15223/policy-004

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