[논문]Study on the Cycling Performance of Li4Ti5O12 Electrode in the Ionic Liquid Electrolytes Containing an Additive

Kim, Jin-Hee; Song, Seung-Wan; Hoang, Hung-Van; Doh, Chil-Hoon; Kim, Dong-Won

doi:10.5012/bkcs.2011.32.1.105

Study on the Cycling Performance of Li4Ti5O12 Electrode in the Ionic Liquid Electrolytes Containing an Additive 원문보기

Bulletin of the Korean chemical society, v.32 no.1, 2011년, pp.105 - 108

Kim, Jin-Hee (Department of Chemical Engineering, Hanyang University) , Song, Seung-Wan (Department of Fine Chemical Engineering & Applied Chemistry, Chungnam National University) , Hoang, Hung-Van (Department of Fine Chemical Engineering & Applied Chemistry, Chungnam National University) , Doh, Chil-Hoon (Korea Electrotechnology Research Institute) , Kim, Dong-Won (Department of Chemical Engineering, Hanyang University)

Abstract ▼ AI-Helper

The cycling behavior of $Li_4Ti_5O_{12}$ electrode in the ionic liquid (IL)-based electrolytes containing 1-butyl-1-methylpyrrolidinium bis(trifluoromethanesulfonyl) imide and a small amount of additive (vinylene carbonate, ethylene carbonate, fluoroethylene carbonate) was investigated. The $Li_4Ti_5O_{12}$ electrode in the IL electrolyte with an additive exhibited reversible cycling behavior with good capacity retention. Electrochemical impedance spectroscopy and FTIR studies revealed that an electrochemically stable solid electrolyte interphase was formed on the $Li_4Ti_5O_{12}$ electrode in the presence of vinylene carbonate and ethylene carbonate during cycling.

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Figure 5. FTIR spectral comparison of a pristine Li₄Ti₅O₁₂ electrode and Li₄Ti₅O₁₂ electrodes cycled in IL-based electrolytes containing different additives. (a) pristine electrode, (b) electrode cycled in LiTFSI/BMP-TFSI only, and electrodes cycled in LiTFSI/BMP-TFSI with (c) FEC, (d) EC, and (e) VC.
Measurements. Linear sweep voltammetry (LSV) was performed in order to investigate the electrochemical stability of the IL-based electrolytes on a stainless steel working electrode, with counter and reference electrodes of lithium metal. A scanning rate was 1.

대상 데이터

4) and calcined at 900 ºC for 20 h. Li₄Ti₅O₁₂ electrodes were prepared by coating N-methyl pyrrolidone (NMP)-based slurry of Li₄Ti₅O₁₂, PVdF, super-P carbon and KS-6 carbon (80:10:5:5) onto a copper foil. The thickness of the electrode was approximately 30 μm and its active mass loading corresponded to a capacity of about 0.

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