Binding agents for electrochemically active materials and methods of forming the same
In some embodiments, an electrode can include a current collector, a composite material in electrical communication with the current collector, and at least one phase configured to adhere the composite material to the current collector. The current collector can include one or more layers of metal, and the composite material can include electrochemically active material. The at least one phase can include a compound of the metal and the electrochemically active material. In some embodiments, a composite material can include electrochemically active material. The composite material can also include at least one phase configured to bind electrochemically active particles of the electrochemically active material together. The at least one phase can include a compound of metal and the electrochemically active material.
1. An electrode comprising:
a current collector comprising one or more layers of metal;
a composite material in electrical communication with the current collector, wherein the composite material comprises from greater than 0% to about 95% by weight of one or more types of carbon phases comprising carbon as a matrix phase and from greater than 0% to about 99% by weight of electrochemically active material, wherein the electrochemically active material comprises particles that are distributed within the matrix phase; and
at least one phase between the composite material and the current collector, wherein the at least one phase is configured to adhere the composite material to the current collector, and wherein the at least one phase comprises a compound of the metal and the electrochemically active material, and comprises localized phases comprising metal silicide particles surrounded by the composite material, the localized phases scattered across a plane between the current collector and the composite material to a depth in the composite material of 10% or less of composite material thickness.
2. The electrode of claim 1 , wherein the current collector comprises copper, nickel, iron, titanium, molybdenum, stainless steel, chromium, aluminum, or a combination thereof.
3. The electrode of claim 1 , wherein the electrochemically active material comprises silicon, graphite, germanium, tin, silicon oxide (SiOx), aluminum, or a combination thereof.
4. The electrode of claim 1 , wherein the compound comprises a metal silicide.
5. The electrode of claim 4 , wherein the metal silicide comprises copper silicide, nickel silicide, chromium silicide, aluminum silicide, titanium silicide, or a combination thereof.
6. The electrode of claim 1 , wherein the current collector has a Rz surface roughness from about 0.025 μm to about 25 μm.
7. The electrode of claim 6 , wherein the Rz surface roughness is from about 1.5 μm to about 25 μm.
8. The electrode of claim 7 , wherein the Rz surface roughness is from about 3 μm to about 25 μm.
9. The electrode of claim 1 , further comprising at least one second phase within the composite material.
10. The electrode of claim 9 , wherein the at least one second phase is configured to bind electrochemically active particles of the electrochemically active material together.
11. The electrode of claim 10 , wherein the composite material comprises particles of a second metal, and the at least one second phase comprises a compound of the second metal and the electrochemically active material.
12. The electrode of claim 11 , wherein the second metal comprises copper, nickel, iron, titanium, molybdenum, stainless steel, chromium, aluminum, or a combination thereof.
13. The electrode of claim 10 , wherein the at least one second phase comprises a metal silicide.
14. The electrode of claim 13 , wherein the metal silicide comprises copper silicide, nickel silicide, chromium silicide, aluminum silicide, titanium silicide, or a combination thereof.
15. The electrode of claim 1 , wherein the electrochemically active material comprises silicon particles.
16. The electrode of claim 15 , further comprising a metal silicide phase configured to bind the silicon particles together and/or the silicon particles to the one or more types of carbon phases.
17. The electrode of claim 16 , wherein the metal silicide phase comprises copper silicide, nickel silicide, chromium silicide, aluminum silicide, titanium silicide, or a combination thereof.
18. The electrode of claim 1 , wherein the electrochemically active material comprises silicon particles from about 50% to about 99% by weight.
19. The electrode of claim 18 , wherein the electrochemically active material comprises the silicon particles from about 60% to about 99% by weight.
20. The electrode of claim 19 , wherein the electrochemically active material comprises the silicon particles from about 70% to about 99% by weight.
21. The electrode of claim 1 , wherein the electrode is a negative electrode.
22. An electrochemical cell comprising the electrode of claim 1 .
23. The electrochemical cell of claim 22 , wherein the electrochemical cell comprises a lithium ion battery, a magnesium battery, an aluminum battery, a sodium battery, or a combination thereof.