Spectroscopic study of the proton dynamics in manganese dioxide electrode materials

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Proton or lithium diffusion is a critical electrode process that occurs in manganese dioxide electrode materials during cycling of either aqueous (alkaline) or non-aqueous (lithium) batteries. The structural and electrochemical properties of a number of hydrated alpha-phase manganese dioxide compounds ({alpha}-MnO{sub 2}{lg_bullet}nH{sub 2}O; n{approx}0.2-0.33), the heat-treated products (n{approx}0-0.1), as well as their more stable lithia-doped derivatives, {alpha}-[xLi{sub 2}O]{lg_bullet}MnO{sub 2} (0 {le} x {le} 0.25), have been investigated. Inelastic neutron scattering was used as a means to differentiate and interrogate the key proton or water interactions in these MnO{sub 2} structures. The neutron spectra reveal excitations associated with the hydrogen vibrations ... continued below

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8 p.

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Johnson, C.S.; Thackeray, M.M.; Nipko, J.C. & Loong, C.K. October 1, 1997.

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Description

Proton or lithium diffusion is a critical electrode process that occurs in manganese dioxide electrode materials during cycling of either aqueous (alkaline) or non-aqueous (lithium) batteries. The structural and electrochemical properties of a number of hydrated alpha-phase manganese dioxide compounds ({alpha}-MnO{sub 2}{lg_bullet}nH{sub 2}O; n{approx}0.2-0.33), the heat-treated products (n{approx}0-0.1), as well as their more stable lithia-doped derivatives, {alpha}-[xLi{sub 2}O]{lg_bullet}MnO{sub 2} (0 {le} x {le} 0.25), have been investigated. Inelastic neutron scattering was used as a means to differentiate and interrogate the key proton or water interactions in these MnO{sub 2} structures. The neutron spectra reveal excitations associated with the hydrogen vibrations centered at 4, 13, 16, 26, 36, 65, 90, 110, 140, 200, 420, and 490 meV in the alpha-phase and 14, 24, 65, 84, 100, 202, and 425 meV in the lithia-doped derivatives. Band assignments were carried out by comparing these frequencies with those reported for structurally similar hydrated {gamma}-MnO{sub 2} compounds and comparison with infrared data.

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8 p.

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INIS; OSTI as DE97054134

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  • International conference on neutron scattering (ICNS), Toronto (Canada), 17-21 Aug 1997

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  • Other: DE97054134
  • Report No.: ANL/IPNS/CP--93154
  • Report No.: CONF-970814--
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 555233
  • Archival Resource Key: ark:/67531/metadc694361

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  • October 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 15, 2015, 11:58 a.m.

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Johnson, C.S.; Thackeray, M.M.; Nipko, J.C. & Loong, C.K. Spectroscopic study of the proton dynamics in manganese dioxide electrode materials, article, October 1, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc694361/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.