期刊
ACS APPLIED ENERGY MATERIALS
卷 2, 期 4, 页码 2913-2920出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsaem.9b00250
关键词
Na ion battery; activation energy; charge transfer; solid electrolyte; all-solid-state battery
资金
- Japan Society for the Promotion of Science (JSPS) [26289235, JP16H6440]
- Elements Strategy Initiative to Form Core Research Center, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Nanotechnology Platform Program (Molecule and Material Synthesis) of MEXT
- Grants-in-Aid for Scientific Research [26289235] Funding Source: KAKEN
A robust ceramic solid electrolyte with high ionic conductivity is a key component for all-solid-state batteries (ASSBs). In terms of the demand for high-energy-density storage, researchers have been tackling various challenges to use metal anodes, where a fundamental understanding on the metal/solid electrolyte interface is of particular importance. The Na+ superionic conductor, so-called NASICON, has high potential for application to ASSBs with a Na anode due to its high Na+ ion conductivity at room temperature, which has, however, faced a daunting issue of the significantly large interfacial resistance between Na and NASICON. In this work, we have successfully reduced the interfacial resistance as low as 14 Omega cm(2) at room temperature by a simple mechanical compression of a Na/NASICON assembly. We also demonstrate a fundamental study of the Na/NASICON interface in comparison with the Na/beta ''-alumina counterpart by means of the electrochemical impedance technique, which elucidates a stark difference between the activation energies for interfacial charge transfer: similar to 0.6 eV for Na/NASICON and similar to 0.3 eV for Na/beta ''-alumina. This result suggests the formation of a Na+-conductive interphase layer in pressing Na metal on the NASICON surface at room temperature.
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