Stable Cycling of High Nickel Li-Metal Batteries with Limited Li Anode in Fluorine Rich Flame Retardant Electrolytes
Traditional carbonate-based electrolytes are not suitable for high voltage lithium metal batteries (LMBs), which seriously hinders the development of high-energy density LMBs. Here, a novel flame retardant fluorine-rich electrolyte (termed FFT) composed of 1.2 M lithium hexafluorophosphate (LiPF 6 ) in a mixed solvents of fluoroethylene carbonate (FEC), 3,3,3-fluoroethylmethyl carbonate (FEMC) and 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE) was rationally designed and studied. It exhibits noninflammability , low viscosity, good wettability and fluidity, and high oxidation stability. The designed electrolyte enables Li||NMC622 with limited Li anode (50 µm thickness) and high cathode active material loading of 13.8 mg cm -2 (2.5 mAh cm -2 ) to remain 80% capacity after 160 cycles and 135 cycles with a high cut-off of 4.4 V and 4.5 V under charge at C/5 and discharge at C/2 at 25 ℃, respectively. Moreover, the Li||NMC622 using FFT also exhibits excellent low temperature discharge capacity, which could deliver 122 mAh g -1 (about 62% of the discharge capacity at 25 ℃) even at -40 ℃. Further analyses reveal the stable and conductive CEI and SEI with LiF-rich are formed on both cathode and anode, which contributes to the stable cycle of the battery
Year of publication: |
[2022]
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Authors: | Li, Pei ; Chen, Yangyang ; Li, Rui ; Yu, Bo ; Pu, Wang ; Wang, Mingshan ; Chen, Junchen ; Ma, Zhiyuan ; Guo, Bingshu ; Li, Xing |
Publisher: |
[S.l.] : SSRN |
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