Li-ion battery with alumina coated porous silicon anode
A Li-ion battery in one embodiment includes a lithium based compound in a cathode, a first porous silicon portion in an anode, and a layer of atomic layer deposited (ALD) alumina coating the first porous silicon portion and contacting the cathode.
1. A method of forming a Li-ion battery comprising:
determining a desired pore size for a first portion of a porous silicon anode;
determining a Knudsen Diffusion coefficient for the determined pore size;
determining a desired coating extent of less than 100% of the first portion of the porous silicon anode;
determining a soak time for the first portion of porous silicon;
generating an atomic layer deposited (ALD) alumina coating in the first portion of porous silicon using the determined soak time; and
positioning a coated portion of the first portion of porous silicon adjacent to a cathode including a lithium based compound.
2. The method of claim 1 , wherein generating the ALD alumina coating comprises:
generating the ALD alumina coating in a porous silicon slab.
3. The method of claim 1 , further comprising:
positioning a second porous silicon portion in the anode adjacent to the first portion of the porous silicon anode, the second porous silicon portion comprising bulk silicon.
4. The method of claim 3 , wherein positioning the second porous silicon portion in the anode comprises:
positioning the second porous silicon portion in direct contact with an uncoated portion of the first porous silicon portion.
5. The method of claim 3 , further comprising:
positioning a current collector in direct contact with the second porous silicon portion.
6. The method of claim 1 , wherein determining the desired pore size comprises:
determining a nominal pore diameter of about 2 to 5 nanometers.
7. The method of claim 1 , further comprising:
forming a solid electrolyte material within the pores of the first portion of the porous silicon anode.
8. The method of claim 7 , wherein forming the solid electrolyte material comprises:
forming Beta-Alumina-Solid-Electrolyte (BASE) within the pores of the first portion of the porous silicon anode.
9. The method of claim 7 , wherein forming the solid electrolyte material comprises:
forming a poly-crystalline film of alumina within the pores of the first portion of the porous silicon anode.