Guo Xiaolin, Li Yang, Halacoglu Selim, Graff Kincaid, Zhang Chunyan, Fu Kelvin, Xiong Hui Claire, Wang Hui
Mechanical Engineering Department, University of Louisville, Louisville, KY, 40292, USA.
Micron School of Materials Science and Engineering, Boise State University, Boise, ID, 83725, USA.
Small. 2024 Dec;20(52):e2406298. doi: 10.1002/smll.202406298. Epub 2024 Oct 31.
Rechargeable solid-state sodium metal batteries (SSMBs) experience growing attention owing to the increased energy density (vs Na-ion batteries) and cost-effective materials. Inorganic sulfide-based Na-ion conductors also possess significant potential as promising solid electrolytes (SEs) in SSMBs. Nevertheless, due to the highly reactive Na metal, poor interface compatibility is the biggest obstacle for inorganic sulfide solid electrolytes such as NaSbS to achieve high performance in SSMBs. To address such electrochemical instability at the interface, new design of sulfide SE nanostructures and interface engineering are highly essential. In this work, a facile and straightforward approach is reported to prepare 3D sulfide-based solid composite electrolytes (SCEs), which utilize porous NaSbS (NSS) as a self-templated framework and fill with a phase transition polymer. The 3D structured SCEs display obviously improved interface stability toward Na metal than pristine sulfide. The assembled SSMBs (with TiS or FeS as cathodes) deliver outstanding electrochemical cycling performance. Moreover, the cycling of high-voltage oxide cathode NaNiMnO (NNMO) is also demonstrated in SSMBs using 3D sulfide-based SCEs. This study presents a novel design on the self-templated nanostructure of SCEs, paving the way for the advancement of high-energy sodium metal batteries.
可充电固态钠金属电池（SSMBs）由于能量密度提高（相对于钠离子电池）和材料具有成本效益而受到越来越多的关注。基于无机硫化物的钠离子导体作为SSMBs中有前景的固体电解质（SEs）也具有巨大潜力。然而，由于高活性的钠金属，界面相容性差是无机硫化物固体电解质（如NaSbS）在SSMBs中实现高性能的最大障碍。为了解决界面处的这种电化学不稳定性，硫化物SE纳米结构的新设计和界面工程至关重要。在这项工作中，报道了一种简便直接的方法来制备三维硫化物基固体复合电解质（SCEs），其利用多孔NaSbS（NSS）作为自模板框架并填充相变聚合物。三维结构的SCEs对钠金属的界面稳定性明显优于原始硫化物。组装的SSMBs（以TiS或FeS作为阴极）具有出色的电化学循环性能。此外，在使用三维硫化物基SCEs的SSMBs中也展示了高压氧化物阴极NaNiMnO（NNMO）的循环性能。本研究提出了一种关于SCEs自模板纳米结构的新颖设计，为高能钠金属电池的发展铺平了道路。
