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- 저자 : Nosenko Alexander (검색결과 2 건)
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Thermal stability of active electrode material in contact with solid electrolyte
TRON ARTUR,Nosenko Alexander,Mun Junyoung 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.2
For lithium battery systems including solid-state batteries, the solid electrolytes are playing an important role in enhancing the lithium transportation through the electrode/electrolyte interface resulting in the enhanced electrochemical performance of active materials which can prevent the dendrite formation for long term cycle life. However, the formation of the solid electrolyte fi lm on the materials' surface is carrying on via various types of methods. Especially for oxide-salt-type of solid electrolytes of Li 2 O–M x O y –Li x X y system, these solid electrolyte is forming on the surface of materials via the melt quench- ing technique at above 500 °C that can lead to the unstable and degradation the structure of the active materials resulting in the lower performance compared to the traditional (wet-chemistry or solid stare reaction) formation of solid electrolyte fi lm. In this work, the thermochemical stability of the active material in contact with the solid electrolyte after formation via a high-temperature method is investigated by the thermogravimetric and X-ray diff raction analysis, and galvanostatic charge– discharge and cyclic voltammetry measurements confi rm that the electrochemical degradation can be attributed mainly to the partial destruction of cathode structure and surface oxidation of current collector leading to the lower electrochemical performance. The results suggest that the process formation of solid electrolyte film of the oxide-salt system should not exceed 250–300 °C and is highly relevant to a critical area for the active electrode materials without the degradation of the material structure and decreasing electrochemical performance.
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The solid electrolytes Li2O–LiF–Li2WO4–B2O3 with enhanced ionic conductivity for lithium-ion battery
Artur Tron,Alexander nosenko,박영돈,문준영 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.73 No.-
In this study, it is obtained solid electrolytes 60Li2O–10LiF–10Li2WO4–20B2O3 with content of LiF is10 mol% and Li2WO4 with 10 mol% exhibit high ionic conductivity of 1.7410 6 S cm 1 compared to thesolid electrolyte 50Li2O–20Li2WO4–30B2O3 without LiF is 2.510 7 S cm 1 at room temperature. Theobtained solid electrolyte is used as the surface agent of the active material LiCoO2 which displays cyclingstability and low electrode resistance via surface stabilization at a high potential of 4.4 V (vs. Li/Li+) at the1C current density for 100 cycles compared to the pristine material.
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