Li1+yTi2-x-yGexAly(PO4)3 NASICON-Type Electrolytes with Enhanced Conductivity for Solid-State Lithium-Ion Batteries †
Kurnakov Institute of General and Inorganic Chemistry of Russian Academy of Sciences, 31, Leninsky Prospekt, 119991 Moscow, Russia
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Presented at the 1st International Electronic Conference on Processes: Processes System Innovation, 17–31 May 2022; Available online: https://ecp2022.sciforum.net .
Eng. Proc. 2022, 19(1), 10; https://doi.org/10.3390/ECP2022-12627
Published: 23 May 2022
(This article belongs to the Proceedings of The 1st International Electronic Conference on Processes: Processes System Innovation)
Abstract
:The use of lithium-ion batteries allows for a reliable and efficient storage of electricity. Commercial batteries use flammable liquid organic electrolytes, which have a low thermal and electrochemical stability. Replacing liquid electrolytes with solid ones would solve these problems. NASICON-structured electrolytes, in particular LATP (Li1+yTi2-yAly(PO4)3) and LAGP (Li1+yGe2-3yAly(PO4)3), are among the most promising electrolytes for all-solid-state batteries. The partial replacement of titanium ions with germanium ions can lead to materials that combine the high lithium-ion conductivity of LATP with the high chemical stability of LAGP. The aim of this work was to synthesize and study the ionic mobility of Li1+yTi2-x-yGexAly(PO4)3 (x = 0–2, y = 0–0.3) with the NASICON structure. Li1+yTi2-x-yGexAly(PO4)3 (x = 0–2, y = 0–0.3) electrolytes were synthesized with the solid-state method and investigated using X-ray diffraction and scanning electron microscopy, impedance spectroscopy, and NMR spectroscopy. The processes occurring during the solid-state synthesis of Li1+yTi2-x-yGexAly(PO4)3 were studied. An increase in conductivity from 10−7 S/cm to 4.6·10−6 S/cm at 25 °C was found when 10% of titanium ions were replaced with germanium. The additional introduction of aluminum resulted in an increase in lithium conductivity of up to 1.4·10−4 S/cm (25 °C). Since grain boundaries were of decisive importance for the overall ionic conductivity of the NASICON-structured phosphates, the influence of the precursor mechanical treatment on the microstructure and ionic conductivity of the prepared materials was studied. The use of the mechanical treatment led to a significant increase in grain size (reducing the grain boundaries and their resistance) and an increase in ionic conductivity (up to 6.4·10−4 S/cm at 25 °C). The obtained materials could be considered promising solid electrolytes for all-solid-state lithium batteries with high safety and stability.
Supplementary Materials
The Conference presentation can be downloaded at: https://www.mdpi.com/article/10.3390/ECP2022-12627/s1.
Author Contributions
Conceptualization, I.S. and E.K.; methodology, I.S.; investigation, E.K. and I.S.; data curation, I.S.; writing—original draft preparation, E.K.; writing—review and editing, I.S.; supervision, I.S.; project administration, I.S. All authors have read and agreed to the published version of the manuscript.
Funding
This work was supported by the Ministry of Science and Higher Education of the Russian Federation as part of the State Assignment of the Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences.
Institutional Review Board Statement
Not applicable.
Informed Consent Statement
Not applicable.
Data Availability Statement
The data presented in this study are available on request from the corresponding author.
Conflicts of Interest
The authors declare no conflict of interest.
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MDPI and ACS Style
Kurzina, E.; Stenina, I. Li1+yTi2-x-yGexAly(PO4)3 NASICON-Type Electrolytes with Enhanced Conductivity for Solid-State Lithium-Ion Batteries. Eng. Proc. 2022, 19, 10. https://doi.org/10.3390/ECP2022-12627
AMA Style
Kurzina E, Stenina I. Li1+yTi2-x-yGexAly(PO4)3 NASICON-Type Electrolytes with Enhanced Conductivity for Solid-State Lithium-Ion Batteries. Engineering Proceedings. 2022; 19(1):10. https://doi.org/10.3390/ECP2022-12627
Chicago/Turabian StyleKurzina, Ekaterina, and Irina Stenina. 2022. "Li1+yTi2-x-yGexAly(PO4)3 NASICON-Type Electrolytes with Enhanced Conductivity for Solid-State Lithium-Ion Batteries" Engineering Proceedings 19, no. 1: 10. https://doi.org/10.3390/ECP2022-12627
