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학술지 Aluminum Based Sulfide Solid Lithium Ionic Conductors for All Solid State Batteries
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저자
S. Amaresh, K. Karthikeyan, 김광진, 이영기, 이윤성
발행일
201406
출처
Nanoscale, v.6 no.12, pp.6661-6667
ISSN
2040-3364
출판사
Royal Society of Chemistry (RSC)
DOI
https://dx.doi.org/10.1039/c4nr00804a
협약과제
13VB4800, 중대형 전고체 리튬이차전지용 유무기 하이브리드 고체전해질, 이영기
초록
The present work focuses on the synthesis of lithium ionic conductors based on a Li2S-Al2S3-GeS-P2S5 system due to the high ionic conductivity exhibited by the constituents of this system. Mechanical milling for a short duration and a single step heat treatment at a moderate temperature of 550 °C resulted in crystalline powders with high lithium ionic conductivity at room temperature that are comparable to the organic liquid electrolytes. The effect of various aluminum to germanium ratios was studied. Among the samples containing Al : Ge, the ratio of 30 : 70 was found to show high ionic conductivities of 1.7 × 10 -3 S cm-1 at 25 °C and ~6 × 10-3 S cm-1 at 100 °C equivalent. The activation energy of this material was significantly less (Ea = 17 kJ mol-1), which can be considered to be the best value among solid electrolytes. The electrochemical stability was analyzed using cyclic voltammetry between -0.3 and 5.0 V and it was found that the voltammetric profile was smooth without any additional current response, due to electrolyte decomposition, or any other side reaction, except a pair of lithium deposition and stripping peaks. © The Royal Society of Chemistry 2014.
KSP 제안 키워드
Activation Energy, Cyclic voltammetry, Electrolyte decomposition, High ionic conductivity, Ionic Conductors, Mechanical milling, Moderate temperature, Organic liquid electrolytes, Room-temperature, Side reaction, Single step