Three dimensional batteries and methods of manufacturing the same
Various methods and apparatus relating to three-dimensional battery structures and methods of manufacturing them are disclosed and claimed. In certain embodiments, a three-dimensional battery comprises a plurality of non-laminar, three-dimensional electrodes including a plurality of cathodes and a plurality of silicon anodes; and an electrolyte solution in fluid contact with the plurality of electrodes, wherein the electrolyte solution comprises a selected one of lithium (bis)trifluoromethanesulfonimide (LiTFSI), LiClO 4 , LiCF 3 SO 3 , and LiBOB. In certain embodiments, a three-dimensional battery comprises a plurality of electrodes including a plurality of cathodes and a plurality of silicon anodes, wherein either the plurality of cathodes or the plurality of silicon anodes are non-laminar, three-dimensional electrodes; and an electrolyte solution in fluid contact with the plurality of electrodes, wherein the electrolyte solution comprises a salt selected from LiTFSI, LiClO 4 , LiCF 3 SO 3 , and LiBOB. In certain embodiments, a three-dimensional battery comprises a battery enclosure, and a first structural layer within the battery enclosure, where the first structural layer has a first surface, and a first plurality of conductive protrusions extend from the first surface. A first plurality of electrodes is located within the battery enclosure, where the first plurality of electrodes includes a plurality of cathodes and a plurality of anodes, and wherein the first plurality of electrodes includes a second plurality of electrodes selected from the first plurality of electrodes, each of the second plurality of electrodes being in contact with the outer surface of one of said first plurality of conductive protrusions. Some embodiments relate to processes of manufacturing energy storage devices with or without the use of a backbone structure or layer. Some embodiments relate to the use of silicon anodes in combination with an electrolyte containing a selected one of LiTFSI, LiClO 4 , LiCF 3 SO 3 , and LiBOB.
1. A three-dimensional battery, comprising:
a plurality of three-dimensional electrodes, the plurality of electrodes including a plurality of cathodes and a plurality of monolithic silicon anodes arranged in an alternating sequence,
wherein the three-dimensional electrodes comprise protrusions having a length (L) defined in a first direction and a thickness (T) defined in a second direction that is orthogonal to the first direction, with T<L, and wherein the plurality of cathodes and the plurality of monolithic silicon anodes alternate in a direction generally parallel to the second direction; and
an electrolyte solution in fluid contact with the plurality of electrodes, wherein the electrolyte solution comprises an electrolyte salt consisting essentially of LiTFSI.
2. The battery of claim 1 , wherein the ratio of the surface area of the three-dimensional electrodes to their geometric footprint is greater than approximately 2.
3. The battery of claim 1 , wherein the ratio of the surface area of the three-dimensional electrodes to their geometric footprint is between about 2 and about 1000.
4. A method for manufacturing the three-dimensional battery of claim 1 , comprising:
providing a first structural layer, said structural layer having a first surface;
forming a first plurality of conductive protrusions extending from said first surface of said first structural layer;
forming a first plurality of electrodes extending from said first surface of said first structural layer, the first plurality of electrodes comprising a plurality of silicon anodes, wherein each of the first plurality of electrodes contacts the outer surface of one of said first plurality of conductive protrusions; and
providing the electrolyte solution in fluid contact with the first plurality of electrodes.
5. The method of claim 4 , wherein forming the plurality of silicon anodes comprises forming a plurality of silicon anodes by reactively etching a silicon substrate.
6. The method of claim 4 , wherein forming the plurality of silicon anodes comprises forming a plurality of silicon anodes by electrophoretic deposition of silicon-containing particulates.
7. The method of claim 5 , wherein the step of forming each of said anodes comprises reactive etching the silicon substrate to a depth of between approximately 0.1 micron and approximately 1000 microns is formed.
8. The method of claim 6 , wherein the step of forming each of said anodes comprises electrophoretic deposition of silicon until a layer thickness between approximately 0.1 micron and approximately 1000 microns is formed.
9. The method of claim 4 , further comprising:
providing a second structural layer, said second structural layer having a second surface substantially opposing said first surface;
forming a second plurality of conductive protrusions extending from said second surface of said second structural layer and substantially parallel to said first plurality of conductive protrusions; and
forming a second plurality of electrodes, wherein each of said second plurality of electrodes contacts the outer surface of one of said second plurality of conductive protrusions.
10. The method of claim 9 , wherein forming the second plurality of electrodes comprises forming a plurality of cathodes.
11. The method of claim 9 , wherein the second plurality of electrodes protrude among corresponding ones of the first plurality of electrodes.
12. The three-dimensional battery of claim 1 , wherein a maximum current for a first charging cycle of the battery with the electrolyte solution comprising the electrolyte salt consisting essentially of LiTFSI is at least 2.5 times a maximum current for a first charging cycle of the battery with an electrolyte solution comprising an electrolyte salt that is LiPF 6 in place of LiTSFI.