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학술지 Interfacial barrier free organic-inorganic hybrid electrolytes for solid state batteries
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저자
이명주, 신동옥, 김주영, 오지민, 강석훈, 김주미, 김광만, 이용민, 김상욱, 이영기
발행일
202105
출처
Energy Storage Materials, v.37, pp.306-314
ISSN
2405-8297
출판사
Elsevier
DOI
https://dx.doi.org/10.1016/j.ensm.2021.02.013
초록
Organic-inorganic hybrid solid electrolytes (HSEs) are expected to overcome the inherent limitations of rigid fragile inorganic electrolytes for solid state batteries. Li-ion conductive filler such as garnet Li La Zr O (LLZO) is proposed for the high performance of HSEs, unfortunately, which suffers from native surface layer resistance to Li-ion transport. Here we present highly conductive polyvinylidene fluoride (PVDF)-based HSEs incorporating LLZO fillers, whose resistive barriers are eliminated by dry etching. Our optimal composition of etched LLZO fillers (30 wt%) leads to ionic conductivity of 4.05 × 10 S cm , about two-fold improvement from non-etched counterpart. Li symmetric cells with etched fillers exhibit low interfacial resistance of 110 廓 cm and minimal overpotential of 90 mV. Moreover, high capacity of 79 mA h g is highlighted at 4C, comparable or superior to liquid electrolyte or sulfide-based electrolyte devices. Interfacial environment in HSEs ideally modified for Li-ion transport is identified by Li NMR measurements. 7 3 2 12 -4 -1 2 -1 7
KSP 제안 키워드
Barrier-free, High performance, High-capacity, Hybrid electrolytes, Hybrid solid, Inorganic electrolytes, Interfacial barrier, Ion transport, Li NMR, Li-ion, Liquid electrolyte