Manganese dioxides as cathodes for lithium rechargeable cells: the stability challenge

Whittingham, M. Stanley

doi:10.1016/s0167-2738(00)00626-3

Cited by 55 publications

(24 citation statements)

References 22 publications

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“…The parameters are in reasonable agreement with neutron diffraction data [9]; around the Mn there are 6 O at 1.954 Å and 6 Mn at 2.906 Å, although the EXAFS Mn-O distance is shorter than expected from the errors. The effect of doping on the structure to form LiMnNiO 4 and LiMnCoO 4 appears to be slight, as seen from the parameters in Table 1. The Co and Ni clearly substitute for Mn on the 16d octahedral sites, as would be expected due to the similarity in ionic radius.…”

Section: Resultsmentioning

confidence: 99%

“…The subsequent black powder was re-ground and re-heated twice and was quenched at room temperature in a desiccator. The 50% doped materials, LiMnNiO 4 and LiMnCoO 4 , and lightly doped (5 mol %) Ga and In LiMnO 4 , were prepared by the same route using the the appropriate dopant oxide. The preparation of layered LiMnO 2 followed the procedure outlined by Bruce and co-workers [7].…”

Section: Methodsmentioning

confidence: 99%

“…The first generation of batteries employed LiCoO 2 , however this material is both costly and toxic. Therefore there has been research to find an alternative material and lithium manganate systems appear to offer a viable solution to the problems [1][2][3][4]. Spinel-structured lithium manganate, LiMn 2 O 4 , has long been known to intercalate lithium and this material has been extensively explored as a positive electrode.…”

Section: Introductionmentioning

confidence: 99%

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EXAFS studies of lithium manganese oxides

Chadwick

Savin

Packer

et al. 2005

phys. stat. sol. (c)

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Lithium manganese oxides are the subject of intense interest due to their potential application as the positive electrode in rechargeable lithium batteries. Strategies to improve the performance include variation of the chemical structure, via doping with other cations, and changing the crystal structure. In this paper the local structure in spinel LiMn 2 O 4 , both pure and doped with Co, Ni, Ga and In, and layered LiMnO 2 have been investigated by EXAFS spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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EXAFS studies of lithium manganese oxides

Chadwick

Savin

Packer

et al. 2005

phys. stat. sol. (c)

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“…Manganese dioxide (MnO 2 ) can form a wide range of crystalline structures: 50 and due to its high Li + intercalation capacity of more than 200 mAh/g with good cyclic stability, nanostructured MnO 2 has been intensively investigated as promising electrode materials in electrochemical capacitors and Li-ion batteries. 22,23,[51][52][53][54][55] In our lab, template-free hydrous MnO 2 nanowall array films were deposited at a constant voltage of À1.8 V on a platinum (Pt) coated silicon (Si) wafer on the cathode side out of a 0.1 M concentrated solution with Mn(CH 2 COO) 2 $4H 2 O and Na 2 SO 4 dissolved in deionized (DI) water.…”

Section: Design and Fabrication Of Nanostructured Electrodesmentioning

confidence: 99%

Engineering nanostructured electrodes away from equilibrium for lithium-ion batteries

Liu

Zhang

et al. 2011

J. Mater. Chem.

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Boosted by the rapid advances of science and technology in the field of energy materials, Li-ion batteries have achieved significant progress in energy storage performance since their commercial debut in 1991. The development of nanostructured electrode material is regarded as one of the key potentials for the further advancement in Li-ion batteries. This feature article summarizes our recent efforts in the synthesis and characterization of nanostructured electrode materials for high-performance Li-ion batteries. The electrode materials include manganese oxide nanowall arrays, vanadium oxide nanofibers and films, vanadium oxide-carbon nanocomposites, lithium iron phosphate-carbon nanocomposite films, and titanium oxide nanotube arrays. Enhanced Li + intercalation capacities, improved rate capabilities and better cyclic stability were achieved by constructing micro-or nanostructure, controlling materials crystallinity and introducing desired defects on the surface and/or in the bulk. The fabrication of binderless and additive-free nanostructured electrodes for Li-ion batteries via sol-gel processing is also highlighted.

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“…[1][2][3] Magnetic nanocrystals (NCs) such as iron oxide, manganese oxide, and noble metal NCs such as Au and Ag are especially important for their potential applications in fields of high-density magnetic storage, magnetic resonance imaging (MRI), molecular adsorption, and catalysts, chemical sensing, biological applications. [4][5][6][7][8][9][10][11][12][13][14][15][16][17] Recently, various heterostructured NCs composed of noble metal and magnetic oxide have been synthesized, for the purpose of merging the properties of different materials and creating the possibility for new multifunctional applications. 18- 22 For example, live cells can be manipulated using an applied magnetic field and imaging with two-photon fluorescence microscopy under assistance of such multifunctional heterostructured NCs.…”

Section: Introductionmentioning

confidence: 99%

Size-controlled syntheses and hydrophilic surface modification of Fe3O4, Ag, and Fe3O4/Ag heterodimer nanocrystals

Niu

et al. 2010

Dalton Trans.

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High-quality, monodisperse, and size-controlled Fe(3)O(4), Ag, and bifunctional Fe(3)O(4)/Ag heterodimer nanocrystals (NCs) have been synthesized successfully. In the synthesis of Fe(3)O(4) NCs, dodecanol was chosen as the substitute of 1,2-hexadecanediol and "size control" was achieved by simply adjusting the proportion among the ligands instead of utilizing seed-mediated growth. In the synthesis of Ag NCs, organometallic silver acetylacetonate (Agacac) was used as precursors and tunable particle size could be easily obtained by adjusting the reaction temperatures. By using different sized Fe(3)O(4) NCs as seeds, Fe(3)O(4)/Ag heterodimer NCs with particle sizes tuned from 5 to 16 nm for Fe(3)O(4) and 4 to 8 nm for Ag were successfully synthesized and superparamagnetism were maintained. We found that the size of Ag attached on the Fe(3)O(4) NCs relied on the size of Fe(3)O(4) seed. UV-vis absorption spectra and TEM investigations revealed that the bigger the Fe(3)O(4) NCs seed used, the bigger the Ag NCs that were obtained from the heterodimer NCs. In addition, we demonstrated that all of these NCs were successfully transferred into water by surface modification with biocompatible carboxylic acid groups, which made them meet the basic requirement for biolabeling and biomedical applications.

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Manganese dioxides as cathodes for lithium rechargeable cells: the stability challenge

Cited by 55 publications

References 22 publications

EXAFS studies of lithium manganese oxides

EXAFS studies of lithium manganese oxides

Engineering nanostructured electrodes away from equilibrium for lithium-ion batteries

Size-controlled syntheses and hydrophilic surface modification of Fe3O4, Ag, and Fe3O4/Ag heterodimer nanocrystals

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