Na4-Sn2-SbGe5O16,是一个空气稳定的固态离子导体
Sergei Novikov1, Christopher J Franko1, Mengyang Cui1
1Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4M1, Canada.
Inorganic chemistry
|September 18, 2023
概括
这项研究通过用代替锡来增强Na4Sn2Ge5O16中的离子导电性. 由此产生的Na3.8Sn1.8Sb0.2Ge5O16显示出更好的离子导电性,为更好的固体电解质铺平了道路.
科学领域:
- 固态化学 固态化学
- 材料科学是一种材料科学.
- 电化学 电化学 电化学
背景情况:
- 使用单晶X射线衍射来确定Na4Sn2Ge5O16的晶体结构.
- (Na) 原子的大位移参数表明了Na+离子导电性的潜力.
研究的目的:
- 通过制造Na的缺陷来增强Na4Sn2Ge5O16中的Na+流动性.
- 研究用Sb5+替代Sn4+对离子导电性的影响.
主要方法:
- 固态合成Na4-xSbxSn2-xGe5O16 (x = 0-0.35) 样本的固态合成.
- 电阻谱学 (EIS) 测量范围为25-200°C.
- 使用债券价值能量景观 (BVEL) 方法计算Na+迁移路径.
- 固态23Na和119Sn核磁共振 (NMR) 光谱. 固态23Na和119Sn核磁共振 (NMR) 光谱. 固态23Na和119Sn核磁共振 (NMR) 光谱.
主要成果:
- 在200°C时,Na3.8Sn1.8Sb0.2Ge5O16.0获得了1.6mS cm-1的最高离子导电性.
- 计算揭示了具有低能量障碍的二维导电性通道 (约. 0.4 eV) 的电流.
- 与原始阶段相比,NMR研究显示,Sb-doped样本中的各位点之间的Na+交换速度更快.
结论:
- 在Na4Sn2Ge5O16框架中,用Sb5+部分替代Sn4+有效地提高了Na+离子导电性.
- 该材料在固体电解质应用中表现出有前途的性能.
- 了解Na+迁移途径对于设计先进的离子导体至关重要.
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