Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 4, Pages 4001-4010Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.8b19743
Keywords
polymer electrolytes; solid electrolytes; polymerized ionic networks; lithium metal batteries; ionic conductivity
Funding
- Nature Science Foundation of Shaan Xi Province for Significant Basic Research [2017ZDJC-30]
- Fundamental Research Funds for the Central Universities [2018ZDCXL-GY-08-06]
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Solid-state electrolytes are actively sought for their potential application in energy storage devices, especially lithium metal rechargeable batteries. However, one of the key challenges in the development of solid-state electrolytes is their lower ionic conductivity compared with that of liquid electrolytes (10(-2) S cm(-1) at room temperature), where a large gap still exists. Therefore, the pursuit of high ionic conductivity equal to that of liquid electrolytes remains the main objective for the design of solid-state electrolytes. Here, we show a series of high-charge density polymerized ionic networks as solid-state electrolytes that take inspiration from poly(ionic liquid)s. The obtained quasi-solid electrolyte slice displays an astonishingly high ionic conductivity of 5.89 X 10(-3) S cm(-1) at 25 degrees C (the highest conductivity among those of the state-of-art polymer gel electrolytes and polymer solid electrolytes) and ultrahigh decomposition potential, >5.2 V versus Li/Li+, which are attributed to the continuous ion transport channel formed by an ultrahigh ion density and an enhanced chemical stability endowed by highly cross-linked networks. The Li/LiFePO4 and Li/LiCoO2 batteries (3.0-4.4 V) assembled with the solid electrolytes show high stable capacities of around 155 and 130 mAh g(-1), respectively. In principle, our work breaks new ground for the design and fabrication of the solid-state electrolytes in various energy conversion devices.
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