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Kim, Youngsik
YK Research
Research Interests
  • Ionic conducting ceramic electrolyte membranes, energy conversion and storage materials and devices

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Lithium insertion into transition-metal monosulfides: Tuning the position of the metal 4s band

Cited 43 times inthomson ciCited 35 times inthomson ci
Title
Lithium insertion into transition-metal monosulfides: Tuning the position of the metal 4s band
Author
Kim, YoungsikGoodenough, John B.
Keywords
Anode materials; Carbon anodes; Cathode materials; Displacement reactions; High powers; High voltages; Lithium insertion; Lithium-ion Batteries; Low voltages
Issue Date
2008-09
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY C, v.112, no.38, pp.15060 - 15064
Abstract
Concern for safety with carbon anodes has motivated a search for an alternative anode material for high-power lithium-ion batteries. Although sulfides cannot provide the high voltages versus lithium required of a cathode material, whether they can provide the low voltages required of an anode material remains to be determined. Investigation of the displacement reaction 2Li + MS = Li2S + M for M = Ti, V, Cr, Fe, Co, Ni reveals that, with increasing atomic number, the bottom of the M 4s band falls systematically to lower energy and thereby increases the voltage of the displacement reaction. In addition, the reversibility of the displacement reaction is observed to be increased on going to heavier transition-metal atoms. Ex-situ X-ray diffraction (XRD) of the insertion of Li into FeS provides evidence that the reversibility is associated with formation of an amorphous phase rather than Li2S. It is suggested from this investigation that the Tt3+/Ti 2+, V3+/V2+, and Cr3+/Cr 2+ couples in an insertion sulfide can be below the 4s band at V ≤ 1.0 V versus Li+/Li0.
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DOI
10.1021/jp8038847
ISSN
1932-7447
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ECHE_Journal Papers
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