| 1. |
- Doeff, Marca M., et al.
(author)
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A high-rate manganese oxide for rechargeable lithium battery applications
- 2001
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In: Journal of the Electrochemical Society. - : Electrochemical Society Inc. - 0013-4651 .- 1945-7111. ; 148:3, s. A230-A236
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Journal article (peer-reviewed)abstract
- LixMnO2 made by ion exchange of glycine-nitrate combustion synthesis-processed (GNP) orthorhombic Na0.44MnO2 (GNP-LixMnO2) has been cycled in lithium/liquid electrolyte cell configurations at room temperature and lithium/polymer cell configurations at 85 degreesC over one hundred times without showing capacity fading or phase conversion to spinel. At 2.5 mA/cm2 in liquid cells (5C rate) or 1 mA/cm2 (1.5C rate) in polymer cells, 80-95% of the expected capacity is delivered. The remarkable stability is attributable to the unusual double tunnel structure, which cannot easily undergo rearrangement to spinel. The enhanced rate capability of GNP-LixMnO2 compared to conventionally prepared materials is attributable to the shorter particle length, which allows faster diffusion of lithium ions along the tunnels.
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| 2. |
- Doeff, M.M, et al.
(author)
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Transport properties of binary salt polymer electrolytes
- 2000
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In: Journal of Power Sources. - : Elsevier. - 0378-7753 .- 1873-2755. ; 89:2, s. 227-231
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Journal article (peer-reviewed)abstract
- Transport properties (ionic conductivities (σ), salt diffusion coefficients (Ds), and cationic transference numbers (t+0)) as a function of salt concentration (Cs) are reported and compared for several common binary salt/polymer systems being considered for use as electrolytes in rechargeable lithium batteries for electric vehicle and other applications. The three properties provide a complete description of transport in solid polymer electrolytes (SPEs) or "dry" systems in cells undergoing galvanostatic charge and discharge. The macroscopic approach used obviates the need to know the details of speciation in these non-ideal solutions and allows for a more sophisticated correlation of the characteristics of ion transport with polymer structure, salt type, and concentration than conductivity data alone.
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