期刊
SOLID STATE IONICS
卷 327, 期 -, 页码 150-156出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ssi.2018.10.010
关键词
All-solid-state battery; Positive electrode/electrolyte interface; Interfacial modification; X-ray absorption spectroscopy
资金
- Japan Science and Technology Agency (JST)
- Advanced Low Carbon Technology Research and Development Program (ALCA)
- Specially Promoted Research for Innovative Next Generation Batteries (SPRING) Project
- Japan Synchrotron Radiation Research Institute (JASRI) [2015B1011, 2016A1017]
Introduction of an interlayer between a cathode and a sulfide solid electrolyte is a well-known method ft reducing the interfacial resistance and improving the performance of all-solid-state batteries. However, tF mechanism responsible for the interlayer remains unclear because it is difficult to observe the reactions at tf nanometer-scale range. In this study, thin-film model interface of LiCoO2/80Li(2)S.20P(2)S(5) and LiCoO2/Li3PO4, 8OLi(2)S.20P(2)S(5) are fabricated by pulsed-laser deposition. The model interfaces are investigated by performin electrochemical measurements and depth-resolved X-ray absorption spectroscopy to clarify the effect of tt Li3PO4 interlayer. The results indicate that a reaction product layer forms between the LiCoO2 cathode and 80Li(2)S-20P(2)S(5) electrolyte during charge/discharge processes, resulting in high interfacial resistance. Meanwhile the formation of the reaction product layer can be suppressed by the introduction of a Li3PO4 interlayer.
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