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Structural changes in the silver-carbon composite anode interlayer of solid-state batteries

DOI: 10.1016/j.joule.2023.02.001 DOI Help

Authors: Dominic Spencer-Jolly (University of Oxford) , Varnika Agarwal (University of Oxford) , Christopher Doerrer (University of Oxford) , Bingkun Hu (University of Oxford) , Shengming Zhang (University of Oxford) , Dominic L. R. Melvin (University of Oxford) , Hui Gao (University of Oxford) , Xiangwen Gao (University of Oxford) , Paul Adamson (University of Oxford) , Oxana Magdysyuk (Diamond Light Source) , Patrick S. Grant (University of Oxford) , Robert A. House (University of Oxford) , Peter G. Bruce (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Joule , VOL 1

State: Published (Approved)
Published: February 2023
Diamond Proposal Number(s): 26082

Open Access Open Access

Abstract: Ag-carbon composite interlayers have been reported to enable Li-free (anodeless) cycling of solid-state batteries. Here, we report structural changes in the Ag-graphite interlayer, showing that on charge, Li intercalates electrochemically into graphite, subsequently reacting chemically with Ag to form Li-Ag alloys. Discharge is not the reverse of charge but rather passes through Li-deficient Li-Ag phases. At higher charging rates, Li intercalation into graphite outpaces the chemical reactions with Ag, delaying the formation of the Li-Ag phases and resulting in more Li metal deposition at the current collector. At and above 2.5 mA·cm−2, Li dendrites are not suppressed. Ag nanoparticles do not suppress dendrites more effectively than does an interlayer of graphite alone. Instead, Ag in the carbon interlayer results in more homogeneous Li and Li-Ag formation on the current collector during charge.

Diamond Keywords: Batteries; Solid-State Batteries (SSB); Lithium-ion

Subject Areas: Materials, Chemistry, Energy

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing

Added On: 01/03/2023 08:55


Discipline Tags:

Energy Storage Energy Physical Chemistry Energy Materials Chemistry Materials Science Chemical Engineering Engineering & Technology

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