Influence of sintering temperature on conductivity and mechanical behavior of the solid electrolyte LATP

Yan, Gang; Yu, Shicheng; Nonemacher, Juliane Franciele; Tempel, Hermann; Kungl, Hans; Malzbender, Jürgen; Eichel, Rüdiger‐A.; Krüger, Manja

doi:10.1016/j.ceramint.2019.04.191

Cited by 63 publications

(41 citation statements)

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“…However, issues related to crack formation or delamination of interfaces can deteriorate material properties and battery performance [1]. In fact, a large number of publications are available on different synthesis approaches and resulting conductivities of LATP [6][7][8][9][10][11][12][13][14][15], but only a limited number of publications have addressed the failure-relevant mechanical properties of solid electrolytes [6,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

et al. 2022

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LATP sheets with LiF and SiO2 addition prepared by tape cast as electrolytes for solid-state batteries were characterized regarding conductivity, microstructure and mechanical properties aiming toward an optimized composition. The use of additives permitted a reduction of the sintering temperature. Rietveld analyses of the samples with additives revealed a phase mixture of NaSICON modifications crystallizing with rhombohedral and orthorhombic symmetry as a superstructure with space group Pbca. It seems that LiF acts as a sintering additive but also as a mineralizer for the superstructure of LATP. As general trend, higher LiF to SiO2 ratios led to lower porosities and higher values of elastic modulus and hardness determined by indentation testing, but the presence of the orthorhombic LATP leads to a decrease in the ionic conductivity. Micro-pillar testing was used to assess the crack growth behavior revealing weak grain boundaries.

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Section: Introductionmentioning

confidence: 99%

Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

et al. 2022

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“…[16,19,[21][22][23][24][25] Thus, thermal and chemical compatibilities of CAM/SSE at the processing temperature and (electro)chemical properties of the CAM/SSE interphase are the determining factors for the choice of CAM/SSE combinations.Phosphate-based NASICON-type Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 (LATP) is attractive to be employed as the SSE for ASSBs due to its competitive ionic conductivities and good chemical stability in ambient atmosphere. [26][27][28] LATP is considered to have better thermal stability with phospho-olivine LiMPO 4 (M: Fe, Mn, Co, Ni) cathodes because the oxygen atoms are tightly bound to P with the strong covalent bonds in both LATP and LiMPO 4 . [29] It was reported that the mixture of LATP and different phosphate-based CAMs such as LiFePO 4 (LFP), LiCoPO 4 , and LiMn 0.5 Fe 0.5 PO 4 showed promising thermal stabilities at elevated sintering temperatures around 700-800 °C in an inert atmosphere.…”

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Active Interphase Enables Stable Performance for an All‐Phosphate‐Based Composite Cathode in an All‐Solid‐State Battery

Liu

Windmüller

et al. 2022

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High interfacial resistance and unstable interphase between cathode active materials (CAMs) and solid‐state electrolytes (SSEs) in the composite cathode are two of the main challenges in current all‐solid‐state batteries (ASSBs). In this work, the all‐phosphate‐based LiFePO4 (LFP) and Li1.3Al0.3Ti1.7(PO4)3 (LATP) composite cathode is obtained by a co‐firing technique. Benefiting from the densified structure and the formed redox‐active Li3–xFe2–x–yTixAly(PO4)3 (LFTAP) interphase, the mixed ion‐ and electron‐conductive LFP/LATP composite cathode facilitates the stable operation of bulk‐type ASSBs in different voltage ranges with almost no capacity degradation upon cycling. Particularly, both the LFTAP interphase and LATP electrolyte can be activated. The cell cycled between 4.1 and 2.2 V achieves a high reversible capacity of 2.8 mAh cm–2 (36 µA cm–2, 60 °C). Furthermore, it is demonstrated that the asymmetric charge/discharge behaviors of the cells are attributed to the existence of the electrochemically active LFTAP interphase, which results in more sluggish Li+ kinetics and more expansive LFTAP plateaus during discharge compared with that of charge. This work demonstrates a simple but effective strategy to stabilize the CAM/SSE interface in high mass loading ASSBs.

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“…Table 3 shows a comparison of ionic conductivity of LATP sintered at various conditions. In our sol-gel method, high conductive LATP was obtained comparing with other studies at similar sintering conditions [35][36][37][38]. Some studies used sintering additive such as LiF, LiBO 2 and so on.…”

Section: Discussionmentioning

confidence: 64%

Preparation of Li_1.3Al_0.3Ti_1.7(PO₄)₃ solid electrolyte via a sol-gel method using various Ti sources

Kotobuki

Koishi

2020

Journal of Asian Ceramic Societies

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In this study, LATP (Li 1.3 Al 0.3 Ti 1.7 (PO 4) 3) solid electrolyte is prepared by a sol-gel process using Ti(C 2 H 5 O) 4 , Ti(n-C 3 H 7 O) 4 and Ti(n-C 4 H 9 O) 4 as Ti sources to examine the influence of the Ti source on the electrochemical properties of produced LATP. LATP is successfully produced in all cases, however, AlPO 4 impurity is formed in the Ti(n-C 3 H 7 O) 4 and Ti(n-C 4 H 9 O) 4 samples due to insufficient formation of Ti-O-Al network. In contrast, the AlPO 4 formation is not observed in the Ti(C 2 H 5 O) 4 sample. Also, the Ti(C 2 H 5 O) 4 sample shows the highest sinterability and the largest grain size among the three samples. As a result, the Ti(C 2 H 5 O) 4 sample shows the highest Li ion conductivity due to high grain boundary conductivity and less impurity phase. The selection of Ti source is a key to obtain high conductive LATP solid electrolyte.

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Influence of sintering temperature on conductivity and mechanical behavior of the solid electrolyte LATP

Cited by 63 publications

References 61 publications

Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

Active Interphase Enables Stable Performance for an All‐Phosphate‐Based Composite Cathode in an All‐Solid‐State Battery

Preparation of Li_1.3Al_0.3Ti_1.7(PO₄)₃ solid electrolyte via a sol-gel method using various Ti sources

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Influence of sintering temperature on conductivity and mechanical behavior of the solid electrolyte LATP

Cited by 63 publications

References 61 publications

Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

Conductivity, microstructure and mechanical properties of tape-cast LATP with LiF and SiO2 additives

Active Interphase Enables Stable Performance for an All‐Phosphate‐Based Composite Cathode in an All‐Solid‐State Battery

Preparation of Li1.3Al0.3Ti1.7(PO4)3 solid electrolyte via a sol-gel method using various Ti sources

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Preparation of Li_1.3Al_0.3Ti_1.7(PO₄)₃ solid electrolyte via a sol-gel method using various Ti sources