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• W2003183837 abstract "Silicon is being investigated as a negative insertion material due to its high specific capacity (~ 4200 mAh/g) for use in lithium-ion batteries. However, at room temperature a 250% -280% volume expansion is encountered in the active material of the Li-Si system. A highly porous electrode can accommodate the huge volume expansion with little or negligible electrode particle movement (i.e. changes in electrode dimensions). This is important because unless a suitable binder is used or extra space is provided, changes in the dimensions of the composite electrode lead to poor cycling capability. But, a high initial porosity implies a reduced cell energy density. All of these challenges suggest that compared to conventional Li-ion cells the electrode and cell design need to be altered for Li-Si alloy electrodes. Similarly the cell models need to be modified from those available in the literature [1], [2]. In this work [3], porosity changes in a lithium-silicon composite electrode and their impact on cell performance are analyzed with a onedimensional flow model using concentrated solution theory and porous electrode theory. A schematic of a lithium-silicon composite electrode / separator / lithium foil cell with extra head-space called a reservoir is given in Figure 1.The dimensions of the composite electrode are assumed to be constant. The concept of reservoir is introduced for lithium-ion battery systems for room temperature applications to accommodate the liquid phase that gets squeezed out during lithiation of silicon electrode so that it can be available for subsequent delithiation. The contribution of convection to the spatial variation of electrolyte concentration in the cell sandwich mainly arises from the influx or squeezing of the electrolyte (i.e. the liquid phase) as the porosity changes. In the present work, convection is included in the cellsandwich direction. Galvanostatic operation is analyzed for a non-ideal electrolyte with concentration dependent transport properties. Simulation results quantitatively show the importance of a high initial porosity in silicon electrodes for better utilization of active material, especially at low rates (Figure 2). At higher rates, the utilization becomes similar for both thicker, porous electrodes and thinner, less porous electrodes (Figure 3). The insensitivity to porosity and thickness at high" @default.
• W2003183837 created "2016-06-24" @default.
• W2003183837 creator A5030117122 @default.
• W2003183837 creator A5057700685 @default.
• W2003183837 date "2011-01-01" @default.
• W2003183837 modified "2023-09-30" @default.
• W2003183837 title "Analysis of the Lithium-Ion Insertion Silicon Composite Electrode/Separator/Lithium Foil Cell" @default.
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• W2003183837 doi "https://doi.org/10.1149/1.3589301" @default.
• W2003183837 hasPublicationYear "2011" @default.
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