期刊
NANO ENERGY
卷 47, 期 -, 页码 325-330出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nanoen.2018.01.046
关键词
Solid-state electrolyte; Sodium-ion conductor; Sodium-ion battery; Single crystal X-ray; Phonon; Ab initio molecular dynamics
类别
资金
- U.S. Department of Energy's (DOE's) Office of Electricity Delivery & Energy Reliability (OE) [70247]
- National Science Foundation (NSF) [DMR-1610430]
- Penn State ICS Seed Grant
- Office of Science of the U.S. DOE [DE-AC02-05CH11231]
- NSF [ACI-1053575]
Sulfide-based Na-ion conductors are promising candidates as solid-state electrolytes (SSEs) for fabrication of solid-state Na-ion batteries (NIBs) because of their high ionic conductivities and low grain boundary resistance. Currently, most of the sulfide-based Na-ion conductors with high conductivities are focused on Na3PS4 phases and its derivatives. It is desirable to develop Na-ion conductors with new composition and crystal structure to achieve superior ionic conductivities. Here we report a new quaternary Na-ion conductor, Na10.8Sn1.9PS11.8, exhibiting a high ionic conductivity of 0.67 mS cm(-1) at 25 degrees C. This high ionic conductivity originates from the presence of a large number of intrinsic Na-vacancies and three-dimensional Na-ion conduction pathways, which has been confirmed by single-crystal X-ray diffraction and first-principles calculations. The Na10.8Sn1.9PS11.8 phase is further evaluated as an electrolyte in a Na-Sn alloy/TiS2 battery, demonstrating its potential application in all-solid-state NIBs.
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