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Application of surface analytical techniques to the study of the reactivity of lithium toward nonaqueous solvents

Zhuang, Guorong (Vera)
http://rave.ohiolink.edu/etdc/view?acc_num=case1058811391

Abstract Details

1995, Doctor of Philosophy, Case Western Reserve University, Physics.
Ultra-high vacuum (UHV) surface analytical techniques, such as Auger Electron Spectroscopy (AES), Temperature Programmed Desorption (TPD) and Reflection-absorption Fourier Transform Infrared Spectroscopy (RAFTIRS), have been used to study PC/Li, CO/Au and THF/Au systems which were related to the interests of developing secondary Li batteries. An UHV chamber for simultaneous RAFTIRS and microgravimetric measurements has been designed and constructed to acquire reflection/absorption spectra of nonauqueous solvents adsorbed and/or condensed on metal films vapor deposited in situ on the surface of a quartz-crystal microbalance (QCM). The reactivity of perdeuterated propylene carbonate (d6-PC) toward metallic lithium has been examined in UHV using temperature programmed desorption (TPD). The findings suggest that the most likely product of the reaction between PC and metallic Li is a lithium alkyl carbonate. Experiments in which d6-PC was intentionally mixed with CO2, O2 or H2O showed that in each case the impurity reacts with Li to form the expected products without affecting, aAn UHV chamber for simultaneous RAFTIRS and microgravimetric measurements has been designed and constructed to acquire reflection/absorption spectra of nonauqueous solvents adsorbed and/or condensed on metal films vapor deposited in situ on the surface of a quartz-crystal microbalance (QCM). The reactivity of perdeuterated propylene carbonate (d6-PC) toward metallic lithium has been examined in UHV using temperature programmed desorption (TPD). The findings suggest that the most likely product of the reaction between PC and metallic Li is a lithium alkyl carbonate. Experiments in which d6-PC was intentionally mixed with CO2, O2 or H2O showed that in each case the impurity reacts with Li to form the expected products without affecting, other than the net amount, the d6-PC/Li thermal decomposition pathway. The adsorption of CO on evaporated Au films, Au foil and a Au(111) single crystal was investigated by TPD and RAFTIRS. The results indicated that CO weakly chemisorbed on evaporated Au films and Au foil at liquid nitrogen temperatures. However, CO adsorption on Au(111)was defects related. There existed two types of surface bonding sites; one was IR active and the other was IR inactive. The activation of THF on Au was studied. RAFTIRS provided the evidence that the first monolayer of THF adopted a particular orientation upon adsorption on Au due to specific adsorbate/substrate interactions. This was further supported by TPD measurements which showed that first monolayer and bulk species gave rise to different cracking patterns upon thermal activation
Gary Chottiner (Advisor)
97 p.
Physics, Molecular
Lithium; Nonaqueous solvents; Analytical techniques

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Citations

  • Zhuang, G. (1995). Application of surface analytical techniques to the study of the reactivity of lithium toward nonaqueous solvents [Doctoral dissertation, Case Western Reserve University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=case1058811391

    APA Style (7th edition)

  • Zhuang, Guorong (Vera). Application of surface analytical techniques to the study of the reactivity of lithium toward nonaqueous solvents. 1995. Case Western Reserve University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=case1058811391.

    MLA Style (8th edition)

  • Zhuang, Guorong (Vera). "Application of surface analytical techniques to the study of the reactivity of lithium toward nonaqueous solvents." Doctoral dissertation, Case Western Reserve University, 1995. http://rave.ohiolink.edu/etdc/view?acc_num=case1058811391

    Chicago Manual of Style (17th edition)

case1058811391
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© 1995, all rights reserved.
This open access ETD is published by Case Western Reserve University School of Graduate Studies and OhioLINK.