Journal Article

FZJ-2021-04351

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The Impact of Lithium Tungstate on the Densification and Conductivity of Phosphate Lithium Ion Conductors

Odenwald, P.FZJ* ; Ma, Q.FZJ* ; Davaasuren, B. ; Dashjav, E.FZJ* ; Tietz, F.FZJ* ; Wolff, M.FZJ* ; Rheinheimer, W.FZJ* ; Uhlenbruck, S.FZJ* ; Guillon, O.FZJ* ; Fattakhova-Rohlfing, D. (Corresponding author)FZJ*

2022
Wiley-VCH Weinheim

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Please use a persistent id in citations: http://hdl.handle.net/2128/30812  doi:10.1002/celc.202101366

Abstract: Phosphate lithium ion conductors are outstanding electrolyte materials for solid-state lithium batteries. As polycrystalline ceramics, they have to be sintered at high temperatures. Lithium tungstate Li 2 WO 4 (LWO) is reported for the first time as an effective sintering aid to reduce the sintering temperature for one of the most common solid-state lithium ion conductors, Li 1.5 Al 0.5 Ti 1.5 (PO 4 ) 3 (LATP). While densification of LATP without sintering aids requires temperatures of at least 950°C to obtain a relative density of 90%, here relative densities of 90-95% are achieved even at 775°C when 5 wt.% of LWO is added. At 800°C the LATP containing 5 - 7 wt.% LWO densifies to a relative density of 97.2%. The ionic conductivity of LWO containing LATP is generally higher than that of pure LATP sintered at the same temperature. LATP containing 7 wt.% LWO shows high ionic conductivity of 4.4 × 10 -4 S/cm after sintering at 825°C. A significant reduction in sintering temperature, an increase in density and in the ionic conductivity of LATP as well as its non toxicity render LWO a very promising sintering aid for the development of LATP-based solid state batteries.

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Contributing Institute(s):

1. Werkstoffsynthese und Herstellungsverfahren (IEK-1)

Research Program(s):

1. 1221 - Fundamentals and Materials (POF4-122) (POF4-122)
2. 1222 - Components and Cells (POF4-122) (POF4-122)
3. FestBatt-Oxide - Materialplattform 'Oxide' im Rahmen des Kompetenzclusters für Festkörperbatterien (13XP0173A) (13XP0173A)

Appears in the scientific report 2022

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DEAL Wiley ; Essential Science Indicators ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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