期刊
ADVANCED ENERGY MATERIALS
卷 12, 期 48, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/aenm.202201801
关键词
lithium-ion batteries; molecular interactions; PC-based electrolytes; solvation structures; wide-temperature electrolytes
类别
资金
- National Natural Science Foundation of China [U1966214, 22008082]
A PC-based electrolyte with wide-temperature range has been developed by tuning the interactions between lithium ions and propylene carbonate, successfully mitigating the problem of graphite exfoliation caused by co-intercalation. This electrolyte shows compatibility with both graphite and high-nickel cathode, exhibiting an expanded liquid range.
The advancements of lithium-ion batteries indubitably call for advanced electrolytes with superior environmental adaptability and long-term stability. Propylene carbonate (PC) proves to be a competitive solvent with the high permittivity and wide-liquid range, while the application is intrinsically hindered by the poor graphite compatibility and high viscosity. Here, a PC-based electrolyte with wide-temperature range is developed by tuning the strength and topology of the Li+-PC interactions via non-solvating interactions without altering the solvation structure. Thus, the problem of graphite exfoliation caused by Li+-PC co-intercalation can be successfully mitigated. Consequently, such electrolyte shows compatibility with both graphite and high-nickel cathode, exhibiting an expanded liquid range from -90 to 90 degrees C. This work, breaking from the traditional EC-based formula, provides a new strategy for designing PC-enabled electrolyte featuring high performance, wide-temperature compatibility, and sustainability
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