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Li and Li-Al Negative Electrode Characteristics for the Lithium Secondary Battery with a Nonflammable SOCl₂, Li Added, LiCl Saturated AlCl₃-EMIC Molten Salt Electrolyte

1999; The Electrochemical Society of Japan; Volume: 67; Issue: 6 Linguagem: Inglês

10.5796/electrochemistry.67.706

2186-2451

Nobuyuki KOURA, Kazutaka Iizuka, Yasushi Idemoto, Koichi Ui,

Advancements in Battery Materials

An AlCl3-1-ethyl-3-methylimidazolium chloride (EMIC) melt has a wide electrochemical window, and it is nonflammable with no ignition. We have developed the rocking chair type lithium secondary battery with an AlCl3-EMIC melt containing excess LiCl with a saturated solubility as the nonflammable electrolyte. In this paper, when LiCl was added in the acidic melt (AlCl3 > 50 mol %), the solubility of the LiCl and the changes in the physical properties were measured. Moreover, SOCl2 or Li metal was treated to completely remove any small amounts of Al2Cl7−, which was the ionic species for deposited Al, that remained in the melt. As a result, it was confirmed that Al2Cl7− was completely removed based on a cyclic voltammogram (C.V.) using a W electrode. The reversible deposition and dissolution behavior of lithium was indicated from the C.V. for a Li electrode in the SOCl2 containing melt, and it was found that a Li metal would perform as the negative electrode active material.