Journal
SMALL
Volume 16, Issue 30, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202001989
Keywords
fast charging; lithium bisoxalatodifluorophosphate; lithium dendrites; lithium metal batteries; solid electrolyte interphases
Categories
Funding
- National Key R&D Research Program of China [2018YFB0905400]
- National Natural Science Foundation of China [51925207, 51872277, U1910210, 21605136, 51972067]
- Dalian National Laboratory For Clean Energy (DNL) Cooperation Fund, the CAS [DNL 180310]
- Fundamental Research Funds for the Central Universities [Wk2060140026]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2019B151502039]
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Fluorinated solid-electrolyte interphase (SEI) derived from fluoroethylene carbonate (FEC) is particularly favored for dendrite suppression in lithium metal batteries because of the high Young's modulus (approximate to 64.9 Gpa) and low electronic conductivity (10(-31)S cm(-1)) of LiF. However, the transportation ability of Li(+)in this fluorinated SEI under high current densities is limited by the low ionic conductivity of LiF (approximate to 10(-12)S cm(-1)). Herein, by rational design, 0.1mlithium bisoxalatodifluorophosphate (LiDFBOP) is adopted to modify fluorinated SEI in FEC based electrolyte for fast charging lithium metal batteries. Benefiting from the synergetic effect of LiDFBOP and FEC, a fluorinated SEI rich in LiF and Li(x)PO(y)F(z)species can be yielded, which can further improve the stability and ionic conductivity of SEI for fast Li(+)transportation. Meanwhile, the average coulombic efficiency for Li plating/stripping is improved from 92.0% to 96.7%, thus promoting stable cycling of Li||Li symmetrical batteries with dendrite free morphologies, even at high current densities (3.0 mA cm(-2)) and high plating/stripping capacities (3.0 mAh cm(-2)). More attractively, in practical Li||LiNi(0.6)Co(0.2)Mn(0.2)O(2)batteries, the cycling life at 1C and rate capacities at 6C are also significantly improved. Therefore, the synergetic effect of LiDFBOP and FEC provides great potential for achieving advanced lithium metal batteries with fast charging ability.
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