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      Redox-active cathode interphases in solid-state batteries

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          Abstract

          In situ X-ray photoelectron spectroscopy shows the redox-active chemistry of β-Li 3PS 4 at the cathode interface in a solid-state battery.

          Abstract

          All-solid-state batteries are expected to provide a next-generation solution for energy storage. Employing fast conducting lithium thiophosphates as a replacement for liquid electrolytes in conventional lithium ion batteries has shown great promise, however, capacity fading and the underlying interfacial side reactions of thiophosphates and cathode active materials are not yet understood well. In this study, we charge solid-state batteries to different cut-off potentials and find the formation of a redox-active resistive layer in the solid electrolyte, which impedes the conductivity depending on the state-of-charge of the battery. Using electrochemical impedance spectroscopy as well as depth profiling with X-ray photoelectron spectroscopy we find a thick passivation layer at the current collector and decomposition products within the cathode composite. In addition, an in situ electrochemical experiment during X-ray photoelectron spectroscopy shows that the solid electrolyte is redox active at the cathode/solid electrolyte interface in solid-state batteries. This work highlights the importance of protecting interface layers at the current collector, and the influence of the resulting electric potential drop, as well as provides insight into the redox chemistry of lithium conducting thiophosphates.

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          Most cited references 48

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          Issues and challenges facing rechargeable lithium batteries.

          Technological improvements in rechargeable solid-state batteries are being driven by an ever-increasing demand for portable electronic devices. Lithium-ion batteries are the systems of choice, offering high energy density, flexible and lightweight design, and longer lifespan than comparable battery technologies. We present a brief historical review of the development of lithium-based rechargeable batteries, highlight ongoing research strategies, and discuss the challenges that remain regarding the synthesis, characterization, electrochemical performance and safety of these systems.
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            Building better batteries.

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              Challenges for Rechargeable Li Batteries†

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                Author and article information

                Affiliations
                [1 ]Institute of Physical Chemistry
                [2 ]Justus-Liebig-University Giessen
                [3 ]D-35392 Giessen
                [4 ]Germany
                [5 ]Center for Materials Research (LaMa)
                Journal
                JMCAET
                Journal of Materials Chemistry A
                J. Mater. Chem. A
                Royal Society of Chemistry (RSC)
                2050-7488
                2050-7496
                2017
                2017
                : 5
                : 43
                : 22750-22760
                10.1039/C7TA07641J
                © 2017
                Product
                Self URI (article page): http://xlink.rsc.org/?DOI=C7TA07641J

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