Research Progress of Optimizing Conductivity of Garnet-Type Solid Electrolyte Li7La3Zr2O12

doi:10.19894/j.issn.1000-0518.230373

Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (4): 484-495.DOI: 10.19894/j.issn.1000-0518.230373

• Review • Previous Articles

Research Progress of Optimizing Conductivity of Garnet-Type Solid Electrolyte Li₇La₃Zr₂O₁₂

Yi ZHANG, Yu-Tong CHEN, Jing-Yu SHI, Ke-Ke HUANG()

State Key Laboratory of Inorganic Synthesis and Preparative Chemistry，College of Chemistry，Jilin University，Changchun 130012，China

Received:2023-11-28 Accepted:2024-02-11 Published:2024-04-01 Online:2024-04-28
Contact: Ke-Ke HUANG
About author:kkhuang@jlu.edu.cn
Supported by:
the Research Project on Postgraduate Education and Teaching Reform of Jilin University(2021JGZ08)

Abstract

Abstract:

In recent years， the drawbacks of liquid lithium-ion batteries （LIBs） with carbon anodes and organic electrolytes have become more and more obvious. Safety accidents such as electrolyte leakage and overheating combustion occur frequently. In addition， traditional LIBs are unable to meet the demand for high energy density batteries as modern society develops. Due to many disadvantages mentioned above， there is an urgent need to develop a new type of battery that combines high energy density with high safety performance. Introducing a solid electrolyte was found to achieve this. Solid lithium-ion batteries （SSLBs） have higher energy density， wider operating temperature range， and higher safety level than traditional liquid ones. As one of the core materials of solid-state batteries， solid electrolyte is critical to battery performance. Garnet Li₇La₃Zr₂O₁₂ has high Li⁺ conductivity （1×10^-4~1×10^-3 S/cm）， wide electrochemical window （9 V）， and good stability with lithium anodes. Based on these advantages， LLZO stands out among many types of solid-state electrolytes. In this article， the improvements of ionic conductivity in garnet-type solid electrolyte are summarized. Firstly， the crystal structure of LLZO as well as the relationship between structure and conductivity is discussed. Then， three methods for improving lithium ions conductivity are reviewed， including doping element， improving sintering techniques， and adding additives. Finally， several remaining challenges for the future development of garnet-based solid state batteries are presented， which can be used as a reference for related research.

Key words: Lithium-ion battery, Solid electrolyte, Garnet, Lithium-ion conductivity, Optimizing methods

CLC Number:

O611

Yi ZHANG, Yu-Tong CHEN, Jing-Yu SHI, Ke-Ke HUANG. Research Progress of Optimizing Conductivity of Garnet-Type Solid Electrolyte Li₇La₃Zr₂O₁₂[J]. Chinese Journal of Applied Chemistry, 2024, 41(4): 484-495.

Figures/Tables 4

Fig.1 The structure of （a） cubic and （b） tetragonal Li7La3Zr2O12［33］； The loop structures constructed by Li atomic arrangement in （c） cubic and （d） tetragonal phase［31］

Fig.2 Schematic diagram of method to improve ionic conductivity of Li7La3Zr2O12

Fig.3 （a） Nyquist plots of Li6.4A0.2La3Zr2O12 （A=Al， Fe， Ga）［42］；（b） Summary of dopant ion radius and ion conductivity of Zr site in LLZO［61］；（c） Schematic illustration of Li nucleation and propagation mechanisms in high-density and low-density LLZO［62］

Fig.4 Scheme of sintering behavior of LLZT-LCO samples［89］

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Research Progress of Optimizing Conductivity of Garnet-Type Solid Electrolyte Li₇La₃Zr₂O₁₂

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