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Charge-Discharge Characteristics of a LiNi1/3Mn1/3Co1/3O2 Cathode in FSI-based Ionic Liquids

2012; The Electrochemical Society of Japan; Volume: 80; Issue: 10 Linguagem: Inglês

10.5796/electrochemistry.80.808

2186-2451

Yukiko Matsui, Shunsuke Kawaguchi, Toshinori Sugimoto, Manabu Kikuta, Tetsuya Higashizaki, Michiyuki Kono, Masaki Yamagata, Masashi Ishikawa,

Advanced Battery Materials and Technologies

We evaluated the charge-discharge behavior of a LiNi1/3Mn1/3Co1/3O2 (NMC) electrode in a 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMImFSI) ionic liquid. At 163 mAh g−1 after 50 cycles, the discharge capacity of the NMC cathode in LiTFSI/EMImFSI (TFSI− = bis(trifluoromethylsulfonyl)imide) at 1.0 C in the voltage range 3.0–4.5 V (vs. Li/Li+) is comparable to that in the conventional electrolyte, LiPF6/EC+DMC. Moreover, the rate capability of the cell with LiTFSI/EMImFSI exceeded that with LiPF6/EC+DMC, especially at high rates, probably owing to the low resistance at the electrode/electrolyte interface. These results suggest that EMImFSI is a suitable electrolyte for lithium-ion batteries utilizing an NMC cathode.