期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 51, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202007172
关键词
homogeneous ion conduction; lithium batteries; poly ethylene oxide; solid-state electrolytes
类别
资金
- National Natural Science Foundation of China [51972313, 51927803, 51525206]
- National Key R&D Program of China [2016YFA0200102, 2016YFB0100100]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA22010602]
- Youth Innovation Promotion Association of the Chinese Academy of Sciences [Y201942]
- Special Projects of the Central Government in Guidance of Local Science and Technology Development [2020JH6/10500024]
- Key Research Program of the Chinese Academy of Sciences [KGZD-EW-T06]
- Bureau of Industry and Information Technology of Shenzhen [201901171523]
Poly(ethylene oxide) (PEO)-based electrolytes are promising for all-solid-state batteries but can only be used above room temperature due to the high-degree crystallization of PEO and the intimate affinity between ethylene oxide (EO) chains and lithium ions. Here, a homogeneous-inspired design of PEO-based solid-state electrolytes with fast ion conduction is proposed. The homogeneous PEO-based solid-state electrolyte with an adjusted succinonitrile (SN) and PEO molar ratio simultaneously suppresses the PEO crystallization and mitigates the affinity between EO and Li+. By adjusting the molar ratio of SN to PEO (SN:EO approximate to 1:4), channels providing fast Li(+)transport are formed within the homogeneous solid-state polymer electrolyte, which increases the ionic conductivity by 100 times and enables their application at a low temperature (0-25 degrees C), together with the uniform lithium deposition. This modified PEO-based electrolyte also enables a LiFePO(4)cathode to achieve a superior Coulombic efficiency (>99%) and have a long life (>750 cycles) at room temperature. Moreover, even at a low temperature of 0 degrees C, 82% of its room-temperature capacity remains, demonstrating the great potential of this electrolyte for practical solid-state lithium battery applications.
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