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A wide-temperature superior ionic conductive polymer electrolyte for lithium metal battery
journal contribution
posted on 2020-07-01, 00:00 authored by Z Lin, X Guo, Z Wang, B Wang, S He, Luke O'DellLuke O'Dell, J Huang, H Li, H Yu, L ChenPolymer electrolytes are one of promising candidates that can meet the demands of high safety and stability of high-energy lithium metal batteries. However, the practical applications of polymer electrolytes are usually limited by the low ionic conductivity, narrow electrochemical window and highly interfacial resistance. Here we designed a poly(vinyl ethylene carbonate) polymer electrolyte for polymer lithium metal battery by in-situ polymerization method. The new polymer electrolyte provides superior ionic conductivity with 2.1 × 10−3 S cm−1 at 25 °C, wide electrochemical window up to 4.5 V (vs. Li+/Li) and excellent interfacial compatibility to electrodes. The ions transports are mainly achieved from the coupling/decoupling between Li ions and oxygen atoms in C[dbnd]O groups, partially from the coupling/decoupling between Li+ and oxygen atoms in C–O groups, and probably moving/exchange of Li+ between C[dbnd]O and C–O groups in the process of segmental motions in high and low molecular polymers of polymer electrolyte. The lithium metal batteries with LiFePO4 cathode can deliver a high discharge capacity of ~165 mA h g−1 at 25 °C, and even ~104 mA h g−1 at −15 °C with current density of 0.1C. Therefore, the novel polymer electrolyte designed in this study is a promising candidate for high performances polymer lithium metal batteries.
History
Journal
Nano energyVolume
73Article number
104786Pagination
1 - 9Publisher
ElsevierLocation
Amsterdam, The NetherlandsPublisher DOI
ISSN
2211-2855Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalUsage metrics
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No categories selectedKeywords
Poly(vinyl ethylene carboznate) polymerPolymer electrolyteSuperior ionic conductivityLi ions transports mechanismIn-situ polymerizationScience & TechnologyPhysical SciencesTechnologyChemistry, PhysicalNanoscience & NanotechnologyMaterials Science, MultidisciplinaryPhysics, AppliedChemistryScience & Technology - Other TopicsMaterials SciencePhysicsSOLID-ELECTROLYTECOMPOSITEPERFORMANCEANODESUCCINONITRILEINTERPHASEMEMBRANE
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