Journal
IONICS
Volume 28, Issue 6, Pages 2751-2758Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s11581-022-04525-3
Keywords
PEO-based solid polymer electrolytes; All-solid-state lithium-ion batteries; Ionic conductivity; Interfacial properties; Lithium salts
Funding
- National Natural Science Foundation of China [52032005]
- Ministry of Sciences and Technology of China through National Basic Research Program of China (973 Program) [2015CB654604]
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This study aims to investigate the effects of lithium salts on the comprehensive properties of PEO-based solid polymer electrolytes and identify the optimal lithium salts. The results show that the electrolyte with LiTFSI exhibits the highest ionic conductivity and discharge capacity, while the electrolyte with LiFSI demonstrates the best interfacial properties and cycling performance.
For all-solid-state lithium-ion batteries (ASSBs), they have two key parameters including ionic conductivity and interfacial properties. Considering the previous studies focused more on single property, we aimed to investigate the effects of lithium salts on comprehensive properties of PEO-based SPEs and find out the optimal lithium salts. For the SPE with LiTFSI, it has the highest ionic conductivity (5.3 x 10(-6) S cm(-1) at 25 degrees C and 2.4 x 10(-4) S cm(-1) at 60 degrees C) and discharge capacity, mainly due to the lowest crystallinity and the highest lithium-ion transference number. For the SPE with LiFSI, it has the best interfacial properties and cycling performance, mainly due to the denser and flatter LiF SEI layer after cycling. Our work indicates that as for PEO-based ASSBs, LiTFSI can be used to get higher discharge capacities, and LiFSI can be used to get higher retention rate.
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