Crystallization kinetics of Li2S-P2S5 solid electrolyte and its effect on electrochemical performance

Title
Crystallization kinetics of Li2S-P2S5 solid electrolyte and its effect on electrochemical performance
Author
신동욱
Keywords
Solid electrolyte; Lithium phosphorus sulfide; Lithium ion conductivity; Differential thermal analysis; Glass ceramics; Crystal growth
Issue Date
2015-06
Publisher
ELSEVIER SCIENCE BV
Citation
JOURNAL OF POWER SOURCES, v. 284, Page. 44-48
Abstract
The ionic conductivity of 78Li(2)S center dot 22P(2)S(5) glass-ceramics is investigated as a function of the phase and the amount of precipitated crystal produces by two-step heat treatment comprising controlled nucleation and growth stages. Crystallization kinetics of amorphous 78Li(2)S center dot 22P(2)S(5) is analyzed by differential thermal analysis, and the obtained results show that the maximum nucleation rate and crystal growth rate is achieved at 170 degrees C and 230 degrees C, respectively. The heat treatment process is optimized based on classical phase transformation theory, using the maximum nucleation rate and crystal growth rate. The optimized heat treatment consists of nucleation at 170 degrees C for 30 min followed by crystal growth at 230 degrees C for 3 h. Lithium ion conductivity is improved by 89% by using this treatment to control the crystallization kinetics. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0378775315003870http://hdl.handle.net/20.500.11754/25565
ISSN
0378-7753; 1873-2755
DOI
10.1016/j.jpowsour.2015.02.141
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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