4.8 Article

New Insights into the Mechanism of LiDFBOP for Improving the Low-Temperature Performance via the Rational Design of an Interphase on a Graphite Anode

期刊

ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 33, 页码 40042-40052

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c09667

关键词

SEI; electrolyte additive; low temperature; decomposition mechanism; graphite

资金

  1. Key Research and Development (R& D) Projects of Shanxi Province [201903D121180]
  2. Research and Development Project of Key Core and Common Technology of Shanxi Province [2020XXX014]
  3. Natural Science Basic Research Program of Shanxi [S2019-JC-LH-QY-SM-0345]
  4. Youth Innovation Promotion Association of CAS

向作者/读者索取更多资源

By constructing a LiF-rich SEI film on graphite surface and using LiDFBOP as an electrolyte additive, researchers have enhanced the performance of lithium-ion batteries at low temperatures, showing great potential for practical applications.
The high impedance of the solid electrolyte interphase (SEI) is one of the important factors that deteriorate the charge behavior of lithium-ion batteries (LIBs) at low temperatures, which hinders their practical application in portable electronic products and electric vehicles under extreme conditions. Based on this consideration, a LiF-rich SEI film with low impedance, using lithium difluorobis(oxalato)phosphate (LiDFBOP) as an electrolyte additive and a blank electrolyte without commercial additives, is constructed on a graphite surface. The decomposition mechanism of LiDFBOP is further deduced by density functional theory calculations. This additive inhibits the decomposition of the electrolyte and then forms a thin SEI film with more LiF. LiF, possessing high Young's modulus, makes the SEI film dense and stable. At the same time, more LiF/Li2CO3 interfaces are formed to increase the ionic conductivity. Benefiting from the components and the structure of the SEI, the graphite/Li cells exhibit excellent cycling stability (ca. 85.5% initial capacity retention for 200 cycles at 1 C) and an impressive low-temperature performance (ca. 200% capacity for electrolytes without LiDFBOP at -20 degrees C). This work presents an effective strategy for developing a functional electrolyte to meet the requirement of LIBs with enhanced low-temperature performance.

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