期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 50, 页码 44161-44172出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b12352
关键词
partially fluorinated ether; fluoroethylene carbonate; solid electrolyte interphase; 5 V-class spinel-type cathode; lithium-ion battery
资金
- Hyundai Motor Company
- National Research Foundation of Korea - Korean Government (MEST) [NRF-2013-C1AAA001-0030538]
The roles of a partially fluorinated ether (PFE) based on a mixture of 1,1,1,2,2,3,3,4,4-nonafluoro-4-methoxy-butane and 2-(difluoro (methoxy)methyl)-1,1,1,2,3,3,-hepta-fluoropropane on the oxidative durability of an electrolyte under high-voltage conditions, the rate capability of the graphite and 5 V-class LiNia(0.4)Mp(1.6)O(4) (LNMO) electrodes, and the cycling performance of graphite/LNMO full cells are examined, Our findings indicate that the use of PFE as a cosolvent in the electrolyte yields thermally stable electrolytes with self-extinguishing ability. Electrochemical tests confirm that the PFE combined with fluoroethylene carbonate (FEC) effectively alleviates the oxidative decomposition of the electrolyte at the high-voltage LNMO cathode and enables reversible electrochemical reactions of the graphite anodes and LNMO cathodes at high rates. Moreover, the combination of PFE, which mitigates electrolyte decomposition at high voltages, and FEC, which stabilizes the anode-electrolyte interface, enables the reversible cycling of high-voltage full cells (graphite/LNMO) with a capacity retention of 70.3% and a high Coulorribic efficiency of 99.7% after 100 cycles at 1C rate at 30 degrees C.
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