Crystal Structure and Preparation of Li7La3Zr2O12 (LLZO) Solid-State Electrolyte and Doping Impacts on the Conductivity: An Overview

Raju, Md Mozammal; Altayran, Fadhilah; Johnson, Michael; Wang, Danling; Zhang, Qifeng

doi:10.3390/electrochem2030026

Title: Crystal Structure and Preparation of Li7La3Zr2O12 (LLZO) Solid-State Electrolyte and Doping Impacts on the Conductivity: An Overview

Journal Article · 19 July 2021 · Electrochem

DOI: https://doi.org/10.3390/electrochem2030026 · OSTI ID:2504022

; Altayran, Fadhilah; Johnson, Michael;

; Zhang, Qifeng

As an essential part of solid-state lithium-ion batteries, solid electrolytes are receiving increasing interest. Among all solid electrolytes, garnet-type Li7La3Zr2O12 (LLZO) has proven to be one of the most promising electrolytes because of its high ionic conductivity at room temperature, low activation energy, good chemical and electrochemical stability, and wide potential window. Since the first report of LLZO, extensive research has been done in both experimental investigations and theoretical simulations aiming to improve its performance and make LLZO a feasible solid electrolyte. These include developing different methods for the synthesis of LLZO, using different crucibles and different sintering temperatures to stabilize the crystal structure, and adopting different methods of cation doping to achieve more stable LLZO with a higher ionic conductivity and lower activation energy. It also includes intensive efforts made to reveal the mechanism of Li ion movement and understand its determination of the ionic conductivity of the material through molecular dynamic simulations. Nonetheless, more insightful study is expected in order to obtain LLZO with a higher ionic conductivity at room temperature and further improve chemical and electrochemical stability, while optimal multiple doping is thought to be a feasible and promising route. This review summarizes recent progress in the investigations of crystal structure and preparation of LLZO, and the impacts of doping on the lithium ionic conductivity of LLZO.

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Sponsoring Organization:: USDOE

OSTI ID:: 2504022

Journal Information:: Electrochem, Journal Name: Electrochem Journal Issue: 3 Vol. 2; ISSN 2673-3293; ISSN ELECHK

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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