Preparation and Characterization of Cation-Substituted Na3SbS4 Solid Electrolytes
Preparation and Characterization of Cation-Substituted Na3SbS4 Solid Electrolytes
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DOI：
10.1021/acsaem.0c01823
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发表时间：
2020-12-28
影响因子：
6.4
通讯作者：
Hayashi, Akitoshi
中科院分区：
文献类型：
--
作者：
Tsuji, Fumika;Masuzawa, Naoki;Hayashi, Akitoshi
为了实现全固态钠离子电池，必须提高固体电解质的离子电导率和稳定性。已知硫化物Na 3SbS 4电解质在室温下显示出超过10（-3）S cm（-1）的高钠离子电导率。在这项研究中，阳离子取代的Na 3SbS 4固体电解质与过量的Na或Na空位的制备，和取代对材料的电导率的影响进行了检查。掺杂过量Na的Na 3 + xSb 1-xMxS 4（M = Si，Ge，Sn）电解质的离子电导率低于Na 3SbS 4电解质的离子电导率;相反，掺杂Na空位的Na 3-xSb 1-xMoxS 4电解质的离子电导率高于Na 3SbS 4电解质的离子电导率。Na2.88Sb0.88Mo0.12S4电解质显示出最高的室温离子电导率3.9 × 10（-3）S cm（-1）和最低的导电活化能21 kJ mol（-1）。为了提高Na 3SbS 4电解质的离子电导率，发现引入Na空位而不是过量Na是有效的。
To realize all-solid-state sodium-ion batteries, the ionic conductivities and stabilities of solid electrolytes must be improved. The sulfide Na3SbS4 electrolyte is known to show a high sodium-ion conductivity of over 10(-3) S cm(-1) at room temperature. In this study, cation-substituted Na3SbS4 solid electrolytes with excess Na or Na vacancies were prepared, and the effects of substitution on the material conductivity were examined. The ionic conductivities of the Na3+xSb1-xMxS4 (M = Si, Ge, Sn) electrolytes, which were doped with excess Na, were lower than that of the Na3SbS4 electrolyte; in contrast, the conductivities of the Na3-xSb1-xMoxS4 electrolytes, which were doped with Na vacancies, were higher. The Na2.88Sb0.88Mo0.12S4 electrolyte showed the highest room-temperature ionic conductivity of 3.9 x 10(-3) S cm(-1) and the lowest activation energy for conduction of 21 kJ mol(-1). To improve the ionic conductivity of the Na3SbS4 electrolyte, introducing Na vacancies instead of excess Na was found to be effective.