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Li1.5La1.5MO6 (M = W6+, Te6+) as a new series of lithium-rich double perovskites for all-solid-state lithium-ion batteries

DOI: 10.1038/s41467-020-19815-5 DOI Help

Authors: Marco Amores (University of Sheffield) , Hany El-Shinawi (University of Sheffield; The Faraday Institution) , Innes Mcclelland (University of Sheffield) , Stephen R. Yeandel (Loughborough University) , Peter J. Baker (SIS Pulsed Neutron and Muon Source) , Ronald I. Smith (ISIS Pulsed Neutron and Muon Source) , Helen Y. Playford (ISIS Pulsed Neutron and Muon Source) , Pooja Goddard (Loughborough University) , Serena A. Corr (University of Sheffield) , Edmund J. Cussen (University of Strathclyde)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Nature Communications , VOL 11

State: Published (Approved)
Published: December 2020
Diamond Proposal Number(s): 25120

Open Access Open Access

Abstract: Solid-state batteries are a proposed route to safely achieving high energy densities, yet this architecture faces challenges arising from interfacial issues between the electrode and solid electrolyte. Here we develop a novel family of double perovskites, Li1.5La1.5MO6 (M = W6+, Te6+), where an uncommon lithium-ion distribution enables macroscopic ion diffusion and tailored design of the composition allows us to switch functionality to either a negative electrode or a solid electrolyte. Introduction of tungsten allows reversible lithium-ion intercalation below 1 V, enabling application as an anode (initial specific capacity >200 mAh g-1 with remarkably low volume change of ∼0.2%). By contrast, substitution of tungsten with tellurium induces redox stability, directing the functionality of the perovskite towards a solid-state electrolyte with electrochemical stability up to 5 V and a low activation energy barrier (<0.2 eV) for microscopic lithium-ion diffusion. Characterisation across multiple length- and time-scales allows interrogation of the structure-property relationships in these materials and preliminary examination of a solid-state cell employing both compositions suggests lattice-matching avenues show promise for all-solid-state batteries.

Journal Keywords: Batteries; Energy; Solid-state chemistry; Structure of solids and liquids

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

Subject Areas: Materials, Chemistry, Energy

Instruments: B18-Core EXAFS

Other Facilities: ISIS Neutron and Muon Source


Discipline Tags:

Physical Chemistry Energy Energy Storage Material Sciences Energy Materials Metallurgy Perovskites Chemistry

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS)