ELECTROSPINNING TO FABRICATE BATTERY ELECTRODES
First Claim
1. A method for fabricating an electrode assembly comprising an electrochemically active material for use in a battery, the method comprising:
- providing a thin film substrate having a first surface and a second surface;
depositing an initial layer comprising first electrospun fibers on the first surface using an electrospinning deposition technique, said electrospun fibers comprising the electrochemically active material; and
depositing a second layer comprising second electrospun fibers using the electrospinning deposition technique.
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Accused Products
Abstract
Provided are electrode assemblies that contain electrochemically active materials for use in batteries, such as lithium ion batteries. Provided also are methods for fabricating these assemblies. In certain embodiments, fabrication involves one or more electrospinning operations such as, for example, electrospinning to deposit a layer of fibers on a conductive substrate. These fibers may include one or more electrochemically active materials. In the same or other embodiments, these or similar fibers can serve as templates for depositing one or more electrochemically active materials. Some examples of active materials include silicon, tin, and/or germanium. Also provided are electrode fibers that include cores containing a first active material and shells or optionally second shells (surrounding inner shells) containing a second active material. The second active material is electrochemically opposite to the first active material. One or more shells can function as a separator and/or as an electrolyte.
135 Citations
21 Claims
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1. A method for fabricating an electrode assembly comprising an electrochemically active material for use in a battery, the method comprising:
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providing a thin film substrate having a first surface and a second surface; depositing an initial layer comprising first electrospun fibers on the first surface using an electrospinning deposition technique, said electrospun fibers comprising the electrochemically active material; and depositing a second layer comprising second electrospun fibers using the electrospinning deposition technique. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for fabricating an electrode layer comprising an electrochemically active material for use in a battery, the method comprising:
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depositing an initial layer comprising electrospun fibers comprising the electrochemically active material and having core-shell structures comprising solid cores and solid shells, wherein the solid cores have different compositions than the solid shells; and processing the initial layer to change shapes and/or compositions of the electrospun fibers to form the electrode layer, wherein processing the initial layer forms hollow cylinders from the solid cores. - View Dependent Claims (18)
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19. A method for fabricating an electrode layer comprising an electrochemically active material for use in a battery, the method comprising:
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depositing an initial layer comprising electrospun fibers comprising a polymer material; forming a amorphous silicon coating silicon around the electrospun fibers; and processing the initial layer comprising the electrospun fibers with the amorphous silicon coating to form the electrode layer. - View Dependent Claims (20)
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21. An electrode fiber for use in a battery electrode, the electrode fiber comprising:
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a core comprising a first electrochemically active material; a shell formed around the core and comprising one or more selected from the group consisting of a separator material and/or an electrolyte material; and a second shell formed around the shell and comprising a second electrochemically active material that is electrochemically opposite to the first active material, wherein the shell provides an electronic insulation between the core and the second shell and is configured to transport electrochemically active ions between the core and the second shell.
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Specification