期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 114, 期 49, 页码 21775-21785出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp1054809
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资金
- Evonik Degussa GmbH via an ARC
The ionic liquid (IL) N-methyl-N-butylmorpholinium bis(fluorosulfonyl)imide (C(4)mmor FSI) is examined from physical and electrochemical perspectives. Pulsed field gradient NMR spectroscopy shows that ion diffusivities are low compared with similar, non-ethereal ILs. Ionicity values indicate that above room temperature, less than 50% of ions contribute to conductivity. Lithium cycling in symmetrical cells using a C(4)mmor FSI-based electrolyte is best demonstrated at elevated temperatures. Specific capacities of 130 mAh g(-1) are achieved in a Li-LiFePO4 battery at 85 degrees C. FT-IR spectroscopic investigations of lithium electrodes suggest the presence of alkoxide species in the solid electrolyte interphase (SEI), implying a ring-opening reaction of C(4)mmor with lithium metal. In contrast, the SET derived from N-methyl-N-propylpiperidinium FSI lacks the alkoxide signature but shows signs of alkyl unsaturation, and the activation energy for Li+ transport through this SEI is slightly lower than that for the C(4)mmor-derived SEI Our detailed findings give insight into the capabilities and limitations of rechargeable lithium metal batteries utilizing a C(4)mmor FSI electrolyte.
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