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A Garnet Structure Based All-Solid-State Li Battery without Interface Modification: Resolving Incompatibility Issue on Positive Electrode

Abstract

High-energy all-solid-state lithium batteries (SSLB) based on garnet structured Li7La3Zr2O12 (LLZO) solid electrolyte have been attracted much attention due to their high intrinsic safety for next-generation energy storage devices. However, the necessary of sintering process at elevated temperatures to form ionic diffusion paths through grains usually evolve into highly resistive interfaces between electrode and electrolyte that hampers the development of high performance LLZO based SSLB. Many strategies had been proposed to solve the problem but the achievement was limited. Herein, a new design principle for LLZO based SSLB fabrication that allows high specific areal density and low cell area resistance without interface modification is introduced. To demonstrate that a true bulk-type SSLB can be constructed by this straightforward strategy, the material loading for a composite positive electrode was increased to about 10 times higher than previous reports that results in a high areal capacity of 1.63 mA h cm-2 (i.e.110 mA h g-1) when discharged with a current density of 50 μA cm-2. It also allows one to discharge the fabricated SSLB at a very high current density of 500 μA cm-2 at 50 °C due to the minimized cell area resistance. The new fabrication strategy for LLZO based SSLB paves the way for achieving future high safety and energy density SSLB.

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Publication details

The article was received on 30 Aug 2018, accepted on 07 Nov 2018 and first published on 08 Nov 2018


Article type: Paper
DOI: 10.1039/C8SE00436F
Citation: Sustainable Energy Fuels, 2019, Accepted Manuscript
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    A Garnet Structure Based All-Solid-State Li Battery without Interface Modification: Resolving Incompatibility Issue on Positive Electrode

    C. Tsai, Q. Ma, C. Dellen, S. Lobe, F. Vondahlen, A. Windmüller, D. Grüner, H. Zheng, S. Uhlenbruck, M. Finsterbusch, F. Tietz, D. Fattakhova-Rohlfing, H. P. Bruchkremer and O. Guillon, Sustainable Energy Fuels, 2019, Accepted Manuscript , DOI: 10.1039/C8SE00436F

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