Nano Energy, volume 92, pages 106758

Structural origin of low Li-ion conductivity in perovskite solid-state electrolyte

Lei Xu ¹

Lifeng Zhang ¹

Yubing Hu ¹

Langli Luo ¹

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Institute of Molecular Plus, Tianjin University, 92 Weijin Road, Tianjin 300072, P. R. China. |

Publication type: Journal Article

Publication date: 2022-02-01

Elsevier

Journal: Nano Energy

Quartile SCImago

Quartile WOS

Impact factor: 17.6

ISSN: 22112855

DOI: 10.1016/j.nanoen.2021.106758

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General Materials Science

Electrical and Electronic Engineering

Renewable Energy, Sustainability and the Environment

Abstract

Perovskite solid-state electrolyte, Lithium Lanthanum Titanium Oxide, has long been considered as a promising candidate enabling all-solid-state Li batteries due to its high bulk Li-ion conductivity and wide electrochemical window. However, the Li-ion conductivity at so called “grain boundaries” (GBs) off LLTO pellets is much lower than that of its bulk phase. Thus, understanding the structural origin of the low Li-ion conductivity of LLTO is critical yet remains largely elusive. Here, we identify two types of GBs at different length scales, namely “macro” and “micro” GBs in LLTO pellets and originate them to the processing of LLTO. We also find a nanosized Li-poor orthogonal phase at micro-GBs, which largely deteriorate the Li conduction. Corroborated by electrochemical measurements, we revealed the phase transformation from tetragonal Li 0.33 La 0.56 TiO 3 to orthogonal Li 0.18 La 0.6 TiO 3 during the heat-treatment process is responsible for this deterioration. During phase transformation process, La atoms move to the original Li-rich layer and block the diffusion path of Li-ions in LLTO. These results reveal the structural origin of low Li-ion conductivity in LLTO pellets and provide insights to prevent Li-loss induced phase transformation for commercial application of LLTO. • Two types of grains and corresponding boundaries are identified in LLTO pellets at different length scales, macro vs. micro. • A Li-poor phase has been found existed at both grain boundaries. • The tetra-LLTO phase transition to the Li-poor ortho-phase is due to the heat-treatment when preparing the LLTO pellets. • The existence of hierarchical grain boundaries and Li-poor phase collectively affect the Li-ion conduction in LLTO pellets.

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ACS Nano	ACS Nano, 2, 8% ACS Nano 2 publications, 8%
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ACS applied materials & interfaces	ACS applied materials & interfaces, 1, 4% ACS applied materials & interfaces 1 publication, 4%
eScience	eScience, 1, 4% eScience 1 publication, 4%
Russian Chemical Reviews	Russian Chemical Reviews, 1, 4% Russian Chemical Reviews 1 publication, 4%
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Citations by publishers

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Elsevier	Elsevier, 7, 28% Elsevier 7 publications, 28%
American Chemical Society (ACS)	American Chemical Society (ACS), 7, 28% American Chemical Society (ACS) 7 publications, 28%
Wiley	Wiley, 4, 16% Wiley 4 publications, 16%
Springer Nature	Springer Nature, 2, 8% Springer Nature 2 publications, 8%
Multidisciplinary Digital Publishing Institute (MDPI)	Multidisciplinary Digital Publishing Institute (MDPI), 2, 8% Multidisciplinary Digital Publishing Institute (MDPI) 2 publications, 8%
Royal Society of Chemistry (RSC)	Royal Society of Chemistry (RSC), 2, 8% Royal Society of Chemistry (RSC) 2 publications, 8%
Autonomous Non-profit Organization Editorial Board of the journal Uspekhi Khimii	Autonomous Non-profit Organization Editorial Board of the journal Uspekhi Khimii, 1, 4% Autonomous Non-profit Organization Editorial Board of the journal Uspekhi Khimii 1 publication, 4%
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Xu L. et al. Structural origin of low Li-ion conductivity in perovskite solid-state electrolyte // Nano Energy. 2022. Vol. 92. p. 106758.

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Xu L., Zhang L., Hu Y., Luo L. Structural origin of low Li-ion conductivity in perovskite solid-state electrolyte // Nano Energy. 2022. Vol. 92. p. 106758.

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RIS Copy

TY - JOUR

DO - 10.1016/j.nanoen.2021.106758

UR - https://doi.org/10.1016/j.nanoen.2021.106758

TI - Structural origin of low Li-ion conductivity in perovskite solid-state electrolyte

T2 - Nano Energy

AU - Xu, Lei

AU - Zhang, Lifeng

AU - Hu, Yubing

AU - Luo, Langli

PY - 2022

DA - 2022/02/01 00:00:00

PB - Elsevier

SP - 106758

VL - 92

SN - 2211-2855

ER -

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BibTex Copy

@article{2022_Xu,

author = {Lei Xu and Lifeng Zhang and Yubing Hu and Langli Luo},

title = {Structural origin of low Li-ion conductivity in perovskite solid-state electrolyte},

journal = {Nano Energy},

year = {2022},

volume = {92},

publisher = {Elsevier},

month = {feb},

url = {https://doi.org/10.1016/j.nanoen.2021.106758},

pages = {106758},

doi = {10.1016/j.nanoen.2021.106758}

}

Found error?

Publisher

Elsevier

Journal

Nano Energy

Quartile SCImago

Quartile WOS

Impact factor

17.6

ISSN

22112855 (Print)

Profiles

Luo, Langli