Template electrode structures for depositing active materials
First Claim
1. An electrochemically active electrode material for use in a lithium ion cell, the electrochemically active electrode material comprising:
- a nanostructured template comprising a metal silicide, the nanostructured template comprising nanowires rooted to a substrate, the nanowires comprising substrate-rooted ends and free ends;
a layer of a non-silicide electrochemically active material coating the nanowires, the non-silicide electrochemically active material having a theoretical lithiation capacity of at least about 500 mAh/g, wherein the layer of the non-silicide electrochemically active material is at least twice as thick at the free ends than at the substrate-rooted ends of the nanowires.
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Accused Products
Abstract
Provided are examples of electrochemically active electrode materials, electrodes using such materials, and methods of manufacturing such electrodes. Electrochemically active electrode materials may include a high surface area template containing a metal silicide and a layer of high capacity active material deposited over the template. The template may serve as a mechanical support for the active material and/or an electrical conductor between the active material and, for example, a substrate. Due to the high surface area of the template, even a thin layer of the active material can provide sufficient active material loading and corresponding battery capacity. As such, a thickness of the layer may be maintained below the fracture threshold of the active material used and preserve its structural integrity during battery cycling.
104 Citations
13 Claims
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1. An electrochemically active electrode material for use in a lithium ion cell, the electrochemically active electrode material comprising:
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a nanostructured template comprising a metal silicide, the nanostructured template comprising nanowires rooted to a substrate, the nanowires comprising substrate-rooted ends and free ends; a layer of a non-silicide electrochemically active material coating the nanowires, the non-silicide electrochemically active material having a theoretical lithiation capacity of at least about 500 mAh/g, wherein the layer of the non-silicide electrochemically active material is at least twice as thick at the free ends than at the substrate-rooted ends of the nanowires. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An electrochemically active electrode material for use in a lithium ion cell, the electrochemically active electrode material comprising:
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a nanostructured template comprising a metal silicide; and a non-silicide electrochemically active material shell coating the nanostructured template, the electrochemically active material having a theoretical lithiation capacity of at least about 500 mAh/g, wherein the nanostructured template comprises nanowires rooted to a substrate, the nanowires having substrate-rooted ends and free-ends, wherein the metal silicide of the nanowires have a higher concentration of metal at the substrate-rooted ends than at the free-ends of the nanowires. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification