Structural and Thermodynamic Properties of Cointercalated Titanium Disulfide Academic Article uri icon

abstract

  • The structural and electrochemical characteristics of cointercalated titanium disulfide, LixNayTiSz, have been investigated as a function of lithium content, x, for y = 0.0, 0.04, 0.16, 0.34, and 0.50. The open-circuit voltage of LixNayTiSzvs. lithium has been measured as a function of lithium concentration between 30° and 80°C. The variation of the EMF as a function of x was the same in LixNayTiS2 for x + y < 1.0 as that in LixTiS2 when x < 1.0. The open-circuit voltage vs. lithium decreased to 1.0V when x 4- y > 1.2 and was nearly constant up to x + y ≃ 2.0. Four structures have been observed in the LixNayTiSz materials as the lithium and sodium content is varied: A stage II structure, a stage I(TP) structure, a stage I(TAP) structure, and a IT structure. The structural and open-circuit voltage results have been used to construct a Li-Ti-S isothermal ternary cross section, a Li-Na-TiS2 isothermal pseudoternary cross section and to assess the electrode applications of these novel materials. The Li-Na-TiS2 isothermal pseudoternary cross section indicates that the smaller lithium ion is able to attain higher concentrations within a phase than that of the larger sodium ion. Thus, it appears that ionic size is an important parameter in determining the location of the phase boundaries in intercalated dichalcogenides. © 1986, The Electrochemical Society, Inc. All rights reserved.

author list (cited authors)

  • Johnson, W. B., & Worrell, W. L.

citation count

  • 7

complete list of authors

  • Johnson, William B||Worrell, Wayne L

publication date

  • September 1986