期刊
ACS APPLIED MATERIALS & INTERFACES
卷 11, 期 46, 页码 43252-43260出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b16294
关键词
all-solid-state sodium ion batteries; PEO; ionic liquid; plasticizing mechanism; coordination
资金
- National Basic Research Program of China [2015CB251100]
- National Natural Science Foundation of China [21975026]
- Beijing Natural Science Foundation [L182056]
All-solid-state sodium ion batteries (ASIBs) possess enhanced safety and desired cycling life compared with conventional liquid sodium batteries, showing great potential in large-scale energy storage systems. Polymer electrolytes based on poly(ethylene oxide) (PEO) have been extensively studied for ASIBs due to superior flexibility and processability. However, PEO-based electrolyte without any modification can hardly meet the requirements of ASIBs at room temperature. In the past decade, unremitting efforts have been attached to inhibiting crystallization of PEO, especially via ionic liquid plasticizing. However, the plasticizing mechanism is not clear. Here we incorporated Pyr(13)FSI into PEO-NaClO4 electrolyte to investigate the plasticizing effect by infrared spectrum characterizations and DFT calculations. The results indicate that FSI- anions tend to adhere to the PEO backbone, generating enhanced coordination ability and more coordination sites. Solid-state sodium ion batteries using PEO-NaClO4-40 wt % Pyr(13)FSI as polymer electrolyte exhibit good cycling and rate performance. Insights into the plasticizing mechanism contribute to fabricating polymer electrolyte with high performance for ASIBs.
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