Investigation on the interface between Li10GeP2S12 electrolyte and carbon conductive agents in all-solid-state lithium battery

All-solid-state batteries are considered as one of the attractive alternatives to conventional lithium-ion batteries, due to their intrinsic safe properties benefiting from the use of non-flammable solid electrolytes in ASSBs. However, one of the issues in employing the solid-state electrolyte is th...

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Bibliographic Details
Published in:Scientific reports 2018-05, Vol.8 (1), p.1-7, Article 8066
Main Authors: Yoon, Kyungho, Kim, Jung-Joon, Seong, Won Mo, Lee, Myeong Hwan, Kang, Kisuk
Format: Article
Language:English
Subjects:
639/301/299/891
639/638/161/891
Carbon
Decomposition
Electrical conductivity
Electrochemistry
Electrolytes
Flammability
Humanities and Social Sciences
Interfaces
Ion transport
Lithium
multidisciplinary
Photoelectron spectroscopy
Science
Science (multidisciplinary)
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Summary:All-solid-state batteries are considered as one of the attractive alternatives to conventional lithium-ion batteries, due to their intrinsic safe properties benefiting from the use of non-flammable solid electrolytes in ASSBs. However, one of the issues in employing the solid-state electrolyte is the sluggish ion transport kinetics arising from the chemical and physical instability of the interfaces among solid components including electrode material, electrolyte and additive agents. In this work, we investigate the stability of the interface between carbon conductive agents and Li 10 GeP 2 S 12 in a composite cathode and its effect on the electrochemical performance of ASSBs. It is found that the inclusion of various carbon conductive agents in composite cathode leads to inferior kinetic performance of the cathode despite expectedly enhanced electrical conductivity of the composite. We observe that the poor kinetic performance is attributed to a large interfacial impedance which is gradually developed upon the inclusions of the various carbon conductive agents regardless of their physical differences. The analysis through X-ray Photoelectron Spectroscopy suggests that the carbon additives in the composite cathode stimulate the electrochemical decomposition of LGPS electrolyte degrading its surface during cycling, indicating the large interfacial resistance stems from the undesirable decomposition of the electrolyte at the interface.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-018-26101-4