Reinvestigation of Na 5 GdSi 4 O 12 : A Potentially Better Solid Electrolyte than Sodium ß Alumina for Solid-State Sodium Batteries
Reinvestigation of Na 5 GdSi 4 O 12 : A Potentially Better Solid Electrolyte than Sodium ß Alumina for Solid-State Sodium Batteries
复制标题
重新研究 Na 5 GdSi 4 O 12：一种可能比钠 - 氧化铝更好的固体电解质，用于固态钠电池
DOI：
10.1021/acsami.3c16153
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发表时间：
2024
影响因子：
9.5
通讯作者：
Michalak A
中科院分区：
文献类型：
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作者：
Michalak A
开发可替代易燃有机液体电解质的高性能固体电解质对于设计更安全的固态电池至关重要。在钠离子（Na+）导电固体电解质中，Na-β″-氧化铝（BASE）因其高离子电导率和电化学稳定性而在固态电池中的应用受到高度重视。BASE在商用na - nic2和Na-S电池中应用已久。然而，高导电性BASE的合成是能源密集型的，涉及烧结温度的升高和稳定添加剂的掺入。此外，BASE对湿度高度敏感，这限制了它的应用。因此，人们正在努力寻找合适的高性能固体电解质来取代BASE。在此背景下，我们重新研究了Na5GdSi4O12(NGS)，并证明了相纯NGS可以通过简单的固相反应合成。除了在30°C时具有1.9 × 10-3S cm - 1的高离子电导率（对于BASE为1.5 × 10-3S cm - 1）外，NGS还具有较高的化学和电化学稳定性、较低的界面电阻、较低的沉积和剥离电位以及较高的短路电流，这表明NGS是比BASE更好的固体电解质。
Developing high-performing solid electrolytes that could replace flammable organic liquid electrolytes is vital in designing safer solid-state batteries. Among the sodium-ion (Na+) conducting solid electrolytes, Na-β″-alumina (BASE) is highly regarded for its employment in solid-state battery applications due to its high ionic conductivity and electrochemical stability. BASE has long been employed in commercial Na–NiCl2and Na–S batteries. However, the synthesis of highly conductive BASE is energy-intensive, involving elevated temperatures for sintering and the incorporation of stabilizing additives. Additionally, BASE is highly sensitive to humidity, which limits its applications. Hence, there is an intense search to identify suitable high-performing solid electrolytes that could replace BASE. In this context, we reinvestigated Na5GdSi4O12(NGS) and demonstrated that phase pure NGS could be synthesized by a simple solid-state reaction. Beyond a high ionic conductivity of 1.9 × 10–3S cm–1at 30 °C (1.5 × 10–3S cm–1for BASE), NGS exhibited high chemical as well as electrochemical stability, lower interfacial resistance, lower deposition and stripping potential, and higher short-circuiting current, designating NGS as a better solid electrolyte than BASE.