Influence of Cobalt Introduction on the Phase Equilibrium and Sintering Behavior of Lithium-Ion Conductor Li1.3Al0.3Ti1.7(PO4)3
Influence of Cobalt Introduction on the Phase Equilibrium and Sintering Behavior of Lithium-Ion Conductor Li1.3Al0.3Ti1.7(PO4)3
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钴的引入对锂离子导体Li1.3Al0.3Ti1.7(PO4)3相平衡和烧结行为的影响
DOI：
10.1021/acsaem.2c00996
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发表时间：
2022
影响因子：
6.4
通讯作者：
Takada Kazunori
中科院分区：
文献类型：
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作者：
Miyoshi Shogo;Nishihara Yoshihiko;Takada Kazunori
在研究全固态电池共烧过程中发现了一种与LiCoPO4接触的nasiconon型锂离子导电电解质Li1.3Al0.3Ti1.7(PO4)3（LATP）具有较高的烧结性，本文研究了钴的引入对LATP烧结行为和相平衡的影响。结果表明，在NASICON结构中，1 - 2mol %的钴可以代替组成阳离子。与普通LATP相比，微共掺杂的LATP相具有明显的高烧结性，在800℃下烧结后的相对密度接近80%。钴含量的进一步增加导致多余的钴作为licopo4与其他第二相分离。当标称成分中钛部分被钴（Li1.3+2xAl0.3CoxTi1.7-x(PO4)3）取代时，观察到显著的致密化行为；例如，在800°C forx= 0.1下烧制后，获得了接近100%的相对密度。低熔点化合物LiPO3与licopo4和LiTiO（PO4）形成第二相，具有显著的高烧结性。
After the reported high sinterability of a NASICON-type lithium-ion conducting electrolyte Li1.3Al0.3Ti1.7(PO4)3(LATP) in contact with LiCoPO4, which was found in the studies on a co-firing process for an all-solid-state battery, the present authors have investigated the influence of cobalt introduction on the sintering behavior of LATP as well as the phase equilibrium. It was indicated that 1–2 mol % cobalt is allowed to be a substitute for the constituent cation in the NASICON structure. The slightly Co-doped LATP phase shows a clearly high sinterability compared with a normal LATP, with the relative density approaching 80% after firing at 800 °C. A further increase in the cobalt content results in the separation of the excess cobalt as LiCoPO4together with the other second phases. In the case of the nominal composition such that titanium in LATP is partly replaced by cobalt (Li1.3+2xAl0.3CoxTi1.7-x(PO4)3), a remarkable densification behavior was observed; e.g., a relative density approximating 100% was attained after firing at 800 °C forx= 0.1. The significantly high sinterability is ascribed to a low melting point compound LiPO3, which forms as the second phase together with LiCoPO4and LiTiO(PO4).