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Synthesis and evaluation of new cathode materials for rechargeable lithium batteries. Annual report, April 26, 1976-September 15, 1977

Description: The objective of the first year of this study was the investigation of two new classes of complex sulfide materials of potential value for ambient and high temperature, high energy rechargeable batteries with lithium anodes. The two new classes were the sulfospinels and simple and mixed layered disulfides of transitional metals of groups IVB and VB. In addition, three simple sulfides, CoS, CoS/sub 2/ and FeS/sub 2/ were also investigated. Studies of the synthesis methods have resulted in the de… more
Date: December 1, 1977
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Structure and dynamics in low-dimensional guest-host systems

Description: New synthetic materials continue to be discovered at a rapid rate. Many of these can be broadly described as guest-host systems, in the sense that a range of compositions is accessible by selectively inserting heteroatoms or molecules into the interstitial sites in an otherwise pure starting material. The premier examples are layer intercalates (graphite, transition metal di- and trichalocogenides, silicate clays) and doped polymers (notably polyacetylene). With a somewhat broader definition of… more
Date: April 1, 1992
Creator: Fischer, J.E. (Pennsylvania Univ., Philadelphia, PA (United States). Dept. of Materials Science)
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Studies in the theory of solids

Description: The surface arrangement of atoms in a solid controls the energetically slowly varying features of a LEED spectrum. Because of inelastic collisions within the solid, the LEED electrons mainly sample a surface sandwich of atoms. Thus, the surface sandwich reflectivity, computed by using a method which considers only single reflections of the electron by sheets of atoms in the solid, can be directly compared with the slowly varying, surface dependent features in the data. The method was used to de… more
Date: January 1, 1979
Creator: Hjalmarson, H. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrochemical investigations of novel electrode materials. Progress report, 1 August 1978-31 July 1979. [Li/sub x/Na/sub 0/ /sub 18/ TiS/sub 2/ and Li/sub x/Na/sub 0/ /sub 18/ TaS/sub 2/ cathodes, Li anode]

Description: Electrochemical investigations of the compositional variation of the chemical potential and chemical diffusivity of lithium in Li/sub x/TaS/sub 2/ and Li/sub x/TiS/sub 2/ were completed. The experimental results were used to increase understanding of the chemical bonding and transport mechanisms of lithium in the layered-structured intercalated disulfides. The major emphasis during the year was to expand earlier investigations of the co-intercalated disulfides: Li/sub x/Na/sub 0/ /sub 18/TaS/su… more
Date: April 1, 1979
Creator: Worrell, W. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Structural study of high temperature metal-rich titanium sulfide phases

Description: Ti/sub 2/S and Ti/sub 8/S/sub 3/ have been prepared by high temperature annealing techniques. The crystal structures of these two phases have been determined from single crystal x-ray diffraction data. Both structures were refined using a full-matrix least-squares treatment of positional parameters and isotropic temperature factor coefficients. Ti/sub 2/S crystallizes with orthorhombic symmetry, space group Pnnm, having unit cell dimensions a = 11.367A, b= 14.060A, and c = 3.326A. Ti/sub 2/S is… more
Date: January 1, 1979
Creator: Owens, J.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Thermal modeling of the lithium/polymer battery

Description: Research in the area of advanced batteries for electric-vehicle applications has increased steadily since the 1990 zero-emission-vehicle mandate of the California Air Resources Board. Due to their design flexibility and potentially high energy and power densities, lithium/polymer batteries are an emerging technology for electric-vehicle applications. Thermal modeling of lithium/polymer batteries is particularly important because the transport properties of the system depend exponentially on tem… more
Date: October 1, 1994
Creator: Pals, C. R.
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Review of lithium-ion technology

Description: The first practical use of graphite intercalation compounds (GIC) as battery anodes was reported in a 1981 patent by Basu in which a molten salt cell was described having a negative electrode that consisted of lithium intercalated in graphite. A second patent by Basu, issued in 1983, described an ambient temperature rechargeable system which also utilized lithium intercalated in graphite as the anode. Work in this area progressed at a low level, however, until interest was sparked in 1990 when … more
Date: December 31, 1993
Creator: Levy, S. C. & Cieslak, W. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Angle resolved photoemission on K{sub 0.3}MoO{sub 3}, TiTe{sub 2} and Ti{sub 1+x}S{sub 2}

Description: The authors have performed high resolution angle resolved photoemission spectroscopy (HRARPES) on samples of K{sub 0.3}MoO{sub 3}, TiTe{sub 2} and Ti{sub 1+x}S{sub 2}, materials which are a quasi-one dimensional metal, a quasi-two dimensional metal, and a quasi two-dimensional metal (x > 0) or semi-conductor (x = 0), respectively. They are interested in looking at these samples using HRARPES as part of the general program to assess the use of photoemission to determine whether a particular syst… more
Date: September 1, 1994
Creator: Gweon, G. H.; Allen, J. W.; Zhang, Y.; Claessen, R.; Ellis, W. P.; Shen, Z. X. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Synchrotron studies of narrow band materials. Progress report, July 1, 1993--June 30, 1994

Description: This progress report is divided into: activity (beamtime, data analysis, lab studies); model Fermi liquids and non-Fermi liquids (TiTe{sub 2}-further ARPES and lineshape analysis, TiS{sub 2} ARPES, K{sub 0.3}MoO{sub 3} and Li{sub 0.9}Mo{sub 6}O{sub 17} ARPES); insulator to metal transitions (early transition metal oxides, Fe{sub 3}O{sub 4}, La{sub 2-x}Sr{sub x}CuO{sub 4} ARPES); rare earth and actinide materials (U(Cu{sub 1-x}Pd{sub x}){sub 5}, U(Pt{sub 1-x}Pd{sub x}){sub 3}, CeAl{sub 3} and Ce… more
Date: June 1, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Electrochemical investigations of novel electrode materials. Progress report, November 1, 1981-December 31, 1982

Description: Co-intercalated transition-metal disulfides in which two alkali metals are incorporated into the lattice are unique and unexplored materials. The major objective of our research program is the determination of the structural and electrochemical properties of lithium co-intercalated disulfides. The TiS/sub 2/ compounds have been extensively investigated because of their potential electrode applications in lithium batteries. Progress during the past year is discussed in four sections: preparation… more
Date: June 1, 1982
Creator: Worrell, W L
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Recent advances in lithium ion technology

Description: Lithium ion technology is based on the use of lithium intercalating electrodes. Carbon is the most commonly used anode material, while the cathode materials of choice have been layered lithium metal chalcogenides (LiMX{sub 2}) and lithium spinel-type compounds. Electrolytes may be either organic liquids or polymers. Although the first practical use of graphite intercalation compounds as battery anodes was reported in 1981 for molten salt cells (1) and in 1983 for ambient temperature systems (2)… more
Date: January 1, 1995
Creator: Levy, S. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Rechargeable thin-film lithium batteries

Description: Rechargeable thin-film batteries consisting of lithium metal anodes, an amorphous inorganic electrolyte, and cathodes of lithium intercalation compounds have been fabricated and characterized. These include Li-TiS{sub 2}, Li-V{sub 2}O{sub 5}, and Li-Li{sub x}Mn{sub 2}O{sub 4} cells with open circuit voltages at full charge of about 2.5 V, 3.7 V, and 4.2 V, respectively. The realization of these robust cells, which can be cycled thousands of times, was possible because of the stability of the am… more
Date: September 1, 1993
Creator: Bates, J. B.; Gruzalski, G. R.; Dudney, N. J.; Luck, C. F. & Yu, X.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thin-film rechargeable lithium batteries

Description: Rechargeable thin-films batteries with lithium metal anodes, an amorphous inorganic electrolyte, and cathodes of lithium intercalation compounds have been fabricated and characterized. The cathodes include TiS{sub 2}, the {omega} phase of V{sub 2}O{sub 5}, and the cubic spinel Li{sub x}Mn{sub 2}O{sub 4} with open circuit voltages at full charge of about 2.5 V, 3.7 V, and 4.2 V, respectively. The development of these robust cells, which can be cycled thousands of times, was possible because of t… more
Date: November 1, 1993
Creator: Bates, J. B.; Gruzalski, G. R.; Dudney, N. J.; Luck, C. F. & Yu, X.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Time-resolved picosecond reflectivity study of laser-excited layered compounds

Description: We have employed the pump-and-probe technique to perform picosecond time resolved measurements of the reflectivity changes in two archetypal layered compounds, 1T-TiS/sub 2/ and 1T-TiSe/sub 2/ probed at 1.064 ..mu..m after pumping by 20 ps, 0.532 ..mu..m laser pulses. At the threshold fluence, approx.40 mJ/cm/sup 2/, the reflectivity drops sharply, marking the occurrence of a phase transformation on the surface of the sample. Above threshold, the reflectivity reaches a value as low as approx.0.… more
Date: January 1, 1986
Creator: Huang, C. Y.; Malvezzi, A. M.; Bloembergen, N. & DiSalvo, Jr., F. J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Low temperature alkali metal-sulfur batteries. Final report, December 1, 1974-November 30, 1978

Description: Work on the development of rechargeable, ambient-temperature Li/sulfur and Li/metal sulfide batteries is reported. The Li/S system has the cathode material dissolved in the electrolyte, as Li/sub 2/S/sub n/. Tetrahydrofuran, 1M LiAsF/sub 6/, is one of the more attractive electrolytes discovered for this cell, since it can dissolve up to approx. 10M S as Li/sub 2/Sn. Despite the oxidative nature of the electrolyte, Li is stable in it and can be electrodeposited from it on battery charge. Cells o… more
Date: March 1, 1980
Creator: Brummer, S. B.; Rauh, R. D.; Abraham, K. M.; Dampier, F. W.; Subrahmanyam, V.; Pearson, G. F. et al.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The metal-rich sulfides and phosphides of the early transition metals

Description: Early work on the preparation of refractory metal-rich compounds of the early transition metals resulted in the understanding that metal-metal bonding results in a structural variety that plays an important role in the high-temperature chemistry of these systems. The binary metal-rich systems have been thoroughly studied at high temperatures, and the structures of most, if not all, of the refractory sulfides and phosphides are known. More recently new ternary phases have been discovered, and th… more
Date: June 1, 1996
Creator: Franzen, H.F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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