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Title: Dopant-Dependent Stability of Garnet Solid Electrolyte Interfaces with Lithium Metal

Journal Article · · Advanced Energy Materials

Li7La3Zr2O12 (LLZO) garnet-based materials doped with Al, Nb or Ta to stabilize the Li+-conductive cubic phase are a particularly promising class of solid electrolytes for all-solid-state lithium metal batteries. Understanding of the intrinsic reactivity between solid electrolytes and relevant electrode materials is crucial to developing high voltage solid-state batteries with long lifetimes. Using a novel, surface science-based approach to characterize the intrinsic reactivity of the Li-solid electrolyte interface, we determine that, surprisingly, some degree of Zr reduction takes place for all three dopant types, with the extent of reduction increasing as Ta < Nb < Al. Significant reduction of Nb also takes place for Nb-doped LLZO, with electrochemical impedance spectroscopy (EIS) of Li||Nb-LLZO||Li symmetric cells further revealing significant increases in impedance with time and suggesting that the Nb reduction propagates into the bulk. Density functional theory (DFT) calculations reveal that Nb-doped material shows a strong preference for Nb dopants towards the interface between LLZO and Li, while Ta does not exhibit a similar preference. Furthermore EIS and DFT results, coupled with the observed reduction of Zr at the interface, are consistent with the formation of an “oxygen-deficient interphase” (ODI) layer whose structure determines the stability of the LLZO-Li interface.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Vehicle Technologies Office (EE-3V). Battery Materials Research (BMR) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE
Grant/Contract Number:
AC02-06CH11357; AC02‐06CH11357
OSTI ID:
1508374
Alternate ID(s):
OSTI ID: 1494204
Journal Information:
Advanced Energy Materials, Vol. 9, Issue 12; ISSN 1614-6832
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 179 works
Citation information provided by
Web of Science

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The Electronic Conductivity of Single Crystalline Ga‐Stabilized Cubic Li 7 La 3 Zr 2 O 12 : A Technologically Relevant Parameter for All‐Solid‐State Batteries journal June 2020
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Diffusion Limitation of Lithium Metal and Li–Mg Alloy Anodes on LLZO Type Solid Electrolytes as a Function of Temperature and Pressure journal October 2019
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Air‐Stable and Dendrite‐Free Lithium Metal Anodes Enabled by a Hybrid Interphase of C 60 and Mg journal December 2019
Li/Garnet Interface Stabilization by Thermal‐Decomposition Vapor Deposition of an Amorphous Carbon Layer journal March 2020
Virus‐Templated Nickel Phosphide Nanofoams as Additive‐Free, Thin‐Film Li‐Ion Microbattery Anodes journal September 2019
Design Principles of the Anode–Electrolyte Interface for All Solid‐State Lithium Metal Batteries journal October 2019
Microstrain and electrochemical performance of garnet solid electrolyte integrated in a hybrid battery cell journal January 2019
Rationalizing the interphase stability of Li|doped-Li 7 La 3 Zr 2 O 12 via automated reaction screening and machine learning journal January 2019
Li/Garnet Interface Stabilization by Thermal‐Decomposition Vapor Deposition of an Amorphous Carbon Layer journal February 2020
Microstrain and electrochemical performance of garnet solid electrolyte integrated in a hybrid battery cell text January 2019