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학술지 Interfacial Architecture for Extra Li+ Storage in All-Solid-State Lithium Batteries
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저자
신범룡, 남영진, 김진욱, 이영기, 정윤석
발행일
201407
출처
Scientific Reports, v.4, pp.1-9
ISSN
2045-2322
출판사
Nature Publishing Group
DOI
https://dx.doi.org/10.1038/srep05572
협약과제
13VB4800, 중대형 전고체 리튬이차전지용 유무기 하이브리드 고체전해질, 이영기
초록
The performance of nanocomposite electrodes prepared by controlled ball-milling of TiS2 and a Li2S-P2S5 solid electrolyte (SE) for all-solid-state lithium batteries is investigated, focusing on the evolution of the microstructure. Compared to the manually mixed electrodes, the ball-milled electrodes exhibit abnormally increased first-charge capacities of 416 mA h g-1and 837 mA h g-1 in the voltage ranges 1.5-3.0 V and 1.0-3.0 V, respectively, at 50 mA g-1 and 30°C. The ball-milled electrodes also show excellent capacity retention of 95% in the 1.5-3.0 V range after 60 cycles as compared to the manually mixed electrodes. More importantly, a variety of characterization techniques show that the origin of the extra Li+ storage is associated with an amorphous Li-Ti-P-S phase formed during the controlled ball-milling process.
KSP 제안 키워드
All-solid-state lithium batteries, Ball-milled, Ball-milling process, Characterization techniques, Mixed electrodes, S phase, Solid electrolyte, capacity retention, nanocomposite electrodes