Multidimensional electrochemically active structures for battery electrodes
First Claim
1. A battery electrode structure for use in a battery, the battery electrode structure comprising:
- a conductive substrate; and
a plurality of multidimensional electrochemically active structures attached to and in electronic communication with the conductive substrate, wherein each of the multidimensional electrochemically active structures comprises;
a support comprising metal;
nanowires comprising support-rooted ends attached to the support and free ends extending in different directions away from the support, the nanowires comprising metal silicide of the metal; and
a layer coating the nanowires, the layer comprising an electrochemically active material for inserting and releasing electrochemically active ions during cycling of the battery.
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Abstract
Provided are novel multidimensional electrode structures containing high capacity active materials for use in rechargeable electrochemical cells. These structures include main support structures and multiple nanowires attached to the support structures and extending into different directions away from these supports. The active material may be deposited as a layer (uniform or non-uniform) surrounding the nanowires and, in certain embodiments, the main supports and even substrate. The active material layer may be sufficiently thin to prevent pulverization of the layer at given operating conditions. Interconnections between the electrode structures and/or substrate may be provided by overlaps formed during deposition of the active layer. Silicide-based nano wires structures may be formed on the main supports in a fluidized bed reactor by suspending the metal-containing main supports in a silicon-containing process gas. A layer of silicon may be then deposited over these silicide nanowires.
147 Citations
30 Claims
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1. A battery electrode structure for use in a battery, the battery electrode structure comprising:
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a conductive substrate; and a plurality of multidimensional electrochemically active structures attached to and in electronic communication with the conductive substrate, wherein each of the multidimensional electrochemically active structures comprises; a support comprising metal; nanowires comprising support-rooted ends attached to the support and free ends extending in different directions away from the support, the nanowires comprising metal silicide of the metal; and a layer coating the nanowires, the layer comprising an electrochemically active material for inserting and releasing electrochemically active ions during cycling of the battery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 26, 27, 28)
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25. A lithium ion cell comprising:
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a conductive substrate; and a plurality of multidimensional electrochemically active structures attached to and in electronic communication with the conductive substrate, wherein each of the multidimensional electrochemically active structures comprises; a support comprising metal; nanowires comprising support-rooted ends attached to the support and free-ends extending in different directions away from the support, the nanowires comprising a material selected from the group consisting of metal silicide of the metal, carbon nanotubes, and combinations thereof; and a layer coating the nanowires, the layer comprising an electrochemically active material for inserting and releasing electrochemically active ions during cycling of the lithium ion cell.
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29. A method of fabricating multidimensional electrochemically active structures, the method comprising:
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receiving supports comprising metal; forming nanowires comprising support-rooted ends attached to the supports and free-ends extending into different directions away from the supports, the nanowires comprising metal silicide of the metal; and forming a layer coating the nanowires, the layer comprising an electrochemically active material for inserting and releasing electrochemically active ions during cycling of the electrochemically active material. - View Dependent Claims (30)
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Specification