Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries

Abstract Sulfide ionic conductors are promising candidates as solid electrolytes for all-solid-state batteries due to their high conductivity. However, interfacial instability between cathodes and sulfide electrolytes still remains a challenge because sulfides are highly reactive. To suppress undesi...

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Autores principales:	Chung Bum Lim, Yong Joon Park
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f305654684004e3e957ad2d831137c5a
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spelling	oai:doaj.org-article:f305654684004e3e957ad2d831137c5a2021-12-02T18:18:32ZPrecursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries10.1038/s41598-020-67493-62045-2322https://doaj.org/article/f305654684004e3e957ad2d831137c5a2020-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-67493-6https://doaj.org/toc/2045-2322Abstract Sulfide ionic conductors are promising candidates as solid electrolytes for all-solid-state batteries due to their high conductivity. However, interfacial instability between cathodes and sulfide electrolytes still remains a challenge because sulfides are highly reactive. To suppress undesirable side reactions at the cathode/sulfide electrolyte interface, the surface of the cathode has been modified using stable coating materials. Herein, a precursor based (PB) surface modification using Ta and W is introduced as an effective approach for the formation of a suitable cathode coating layer. Through heat-treatment of the PB surface modification, the source materials (Ta or W) coated on the precursors diffused into the cathode and acted as a dopant. Formation of the surface coating layer was confirmed by X-ray photoelectron spectroscopy (XPS) depth profiles and scanning transmission electron microscopy (STEM) images. The PB surface modified electrodes showed higher capacity, improved rate capability and enhanced cyclic performance compared to those of the pristine electrode. The impedance value of the cells dominantly decreased after cycling due to the modification effect. Moreover, considering the XPS analysis, undesirable reaction products that formed upon cycling were reduced by PB surface modification. These results indicate that PB surface modification using Ta and W effectively suppresses undesirable side reactions and stabilizes the cathode/sulfide electrolyte interface, which is a synergic effect of the doping and coating attributed to Ta and W.Chung Bum LimYong Joon ParkNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-12 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chung Bum Lim Yong Joon Park Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries
description	Abstract Sulfide ionic conductors are promising candidates as solid electrolytes for all-solid-state batteries due to their high conductivity. However, interfacial instability between cathodes and sulfide electrolytes still remains a challenge because sulfides are highly reactive. To suppress undesirable side reactions at the cathode/sulfide electrolyte interface, the surface of the cathode has been modified using stable coating materials. Herein, a precursor based (PB) surface modification using Ta and W is introduced as an effective approach for the formation of a suitable cathode coating layer. Through heat-treatment of the PB surface modification, the source materials (Ta or W) coated on the precursors diffused into the cathode and acted as a dopant. Formation of the surface coating layer was confirmed by X-ray photoelectron spectroscopy (XPS) depth profiles and scanning transmission electron microscopy (STEM) images. The PB surface modified electrodes showed higher capacity, improved rate capability and enhanced cyclic performance compared to those of the pristine electrode. The impedance value of the cells dominantly decreased after cycling due to the modification effect. Moreover, considering the XPS analysis, undesirable reaction products that formed upon cycling were reduced by PB surface modification. These results indicate that PB surface modification using Ta and W effectively suppresses undesirable side reactions and stabilizes the cathode/sulfide electrolyte interface, which is a synergic effect of the doping and coating attributed to Ta and W.
format	article
author	Chung Bum Lim Yong Joon Park
author_facet	Chung Bum Lim Yong Joon Park
author_sort	Chung Bum Lim
title	Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries
title_short	Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries
title_full	Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries
title_fullStr	Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries
title_full_unstemmed	Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries
title_sort	precursor-based surface modification of cathodes using ta and w for sulfide-based all-solid-state batteries
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/f305654684004e3e957ad2d831137c5a
work_keys_str_mv	AT chungbumlim precursorbasedsurfacemodificationofcathodesusingtaandwforsulfidebasedallsolidstatebatteries AT yongjoonpark precursorbasedsurfacemodificationofcathodesusingtaandwforsulfidebasedallsolidstatebatteries
_version_	1718378308961304576

Precursor-based surface modification of cathodes using Ta and W for sulfide-based all-solid-state batteries

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