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Li-Ion Conductive Li1.3Al0.3Ti1.7(PO4)3 (LATP) Solid Electrolyte Prepared by Cold Sintering Process with Various
Mykola Vinnichenko1, Katja Waetzig1, Alf Aurich1
1Fraunhofer IKTS, Winterbergstr. 28, 01227 Dresden, Germany.
Nanomaterials (Basel, Switzerland)
|September 23, 2022
Summary
Cold sintering of lithium aluminum titanium phosphate (LATP) ceramics achieved high relative densities (90-98%) using various additives. While ionic conductivity was lower than conventionally sintered samples, this method offers a promising alternative for solid electrolyte fabrication.
Area of Science:
- Solid-state chemistry and materials science.
- Ceramic processing and characterization.
- Electrochemical energy storage materials.
Background:
- Solid electrolytes are crucial for advanced battery technologies.
- Lithium aluminum titanium phosphate (LATP) is a promising solid electrolyte material.
- Conventional sintering methods for LATP can be energy-intensive and may lead to undesirable microstructures.
Purpose of the Study:
- To investigate the feasibility of cold sintering for producing LATP ceramics.
- To evaluate the effects of liquid and solid sintering additives on LATP densification and properties.
- To compare the performance of cold-sintered LATP with conventionally sintered LATP.
Main Methods:
- Cold sintering of Li1.3Al0.3Ti1.7(PO4)3 (LATP) ceramics at temperatures of 140-280 °C and pressures of 510-600 MPa.
- Utilized various liquid (water, acetic acid, lithium hydroxide solutions) and solid (lithium acetate) sintering additives.
- Characterized density, microstructure, and ionic conductivity of the prepared LATP ceramics.
Main Results:
- Cold-sintered LATP achieved relative densities between 90-98%, comparable or superior to conventionally sintered samples.
- A total ionic conductivity of 1.26 × 10-5 S/cm at room temperature was obtained with water as an additive at 200 °C and 510 MPa.
- Lower ionic conductivities in cold-sintered samples were linked to amorphous secondary phase formation at grain boundaries, dependent on additives and processing conditions.
Conclusions:
- Cold sintering is a viable method for producing dense LATP ceramics with potential for solid electrolyte applications.
- Additive selection and processing parameters significantly influence the densification and ionic conductivity of cold-sintered LATP.
- Further optimization is needed to mitigate amorphous phase formation and enhance ionic conductivity for practical battery performance.
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