Uncovering the role of atmosphere on thermal stability of NASICON type solid electrolytes and oxide-based cathode materials via high temperature X-ray diffraction

Future Batteries Pub Date : 2025-02-01 DOI:10.1016/j.fub.2025.100045

Wen Zhu , Andrea Paolella , Sylvio Savoie , Gabriel Girard , Abdelbast Guerfi , Ashok Vijh , Chisu Kim , Karim Zaghib

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Abstract

Thermal stability of NASICON type solid electrolytes, Li_1.4Al_0.4Ti_1.6(PO₄)₃(LATP) and Li_1.25Al_0.25Ge_1.75(PO₄)₃(LAGP), were studied against LiCoO₂ (LCO), Al-doped LiNi_0.6Mn_0.2Co_0.2O₂ (NCM), LiMn₂O₄ (LMO) and LiCoPO₄ (LCP) in both air and inert gas. An in-situ high temperature X-ray diffractometer was employed to monitor phase changes during the co-sintering of the electrolytes-cathode composites. The effect of atmosphere on the thermal stability of LATP/LAGP is closely related to the stability of cathode material in the composite. LATP and LAGP are less stable in air than in inert gas when in contact with NCM and LCO. However, their thermal stabilities are similar in both air and inert gas when mixed with LMO and LCP. In the composite samples of LATP/LAGP+LMO, only traces of the impurities were detected at 700 °C due to the decomposition of LATP/LAGP. The initial lithium rich LMO loses approximately 5 % of its lithium but retains the same crystal structure. Therefore, the LATP/LAGP + LMO could be promising composite cathodes.

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通过高温x射线衍射揭示了大气对NASICON型固体电解质和氧化物基正极材料热稳定性的影响

研究了NASICON型固体电解质Li1.4Al0.4Ti1.6(PO4)3（LATP）和Li1.25Al0.25Ge1.75(PO4)3（LAGP）在空气和惰性气体中对LiCoO2 （LCO）、al掺杂LiNi0.6Mn0.2Co0.2O2 （NCM）、LiMn2O4 （LMO）和LiCoPO4 （LCP）的热稳定性。采用原位高温x射线衍射仪监测了电解质-阴极复合材料共烧结过程中的相变。气氛对LATP/LAGP热稳定性的影响与复合材料中正极材料的稳定性密切相关。当与NCM和LCO接触时，LATP和LAGP在空气中比在惰性气体中更不稳定。然而，当与LMO和LCP混合时，它们在空气和惰性气体中的热稳定性相似。在LATP/LAGP+LMO的复合样品中，由于LATP/LAGP的分解，在700 °C时仅检测到微量杂质。最初的富锂LMO失去了大约5 %的锂，但保持了相同的晶体结构。因此，LATP/LAGP + LMO是一种很有前途的复合阴极。

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Future Batteries

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