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Interfacial barrier free organic-inorganic hybrid electrolytes for solid state batteries

Title
Interfacial barrier free organic-inorganic hybrid electrolytes for solid state batteries
Authors
Lee, Myeong JuShin, Dong OkKim, Ju YoungOh, JiminKang, Seok HunKim, JumiKim, Kwang ManLee, Yong MinKim, Sang OukLee, Young-Gi
DGIST Authors
Lee, Myeong Ju; Shin, Dong Ok; Kim, Ju Young; Oh, Jimin; Kang, Seok Hun; Kim, Jumi; Kim, Kwang Man; Lee, Yong Min; Kim, Sang Ouk; Lee, Young-Gi
Issue Date
2021-05
Citation
Energy Storage Materials, 37, 306-314
Type
Article
Keywords
COMPOSITE POLYMER ELECTROLYTESION-CONDUCTING MEMBRANEDOPED LI7LA3ZR2O12SURFACE-CHEMISTRYLITHIUM BATTERIESSTABILITYPOLYCRYSTALLINESPECTROSCOPYPERFORMANCEFABRICATION
ISSN
2405-8297
Abstract
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 Li7La3Zr2O12 (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 × 10-4 S cm-1, about two-fold improvement from non-etched counterpart. Li symmetric cells with etched fillers exhibit low interfacial resistance of 110 Ω cm2 and minimal overpotential of 90 mV. Moreover, high capacity of 79 mA h g-1 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 7Li NMR measurements. © 2021 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/13816
DOI
10.1016/j.ensm.2021.02.013
Publisher
Elsevier BV
Related Researcher
  • Author Lee, Yong Min Battery Materials & Systems LAB
  • Research Interests Battery; Electrode; Electrolyte; Separator; Simulation
Files:
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Collection:
Department of Energy Science and EngineeringBattery Materials & Systems LAB1. Journal Articles


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