Olefin separator free Li-ion battery
Implementations of the present disclosure generally relate to separators, high performance electrochemical devices, such as, batteries and capacitors, including the aforementioned separators, and methods for fabricating the same. In one implementation, a method of forming a separator for a battery is provided. The method comprises exposing a metallic material to be deposited on a surface of an electrode structure positioned in a processing region to an evaporation process. The method further comprises flowing a reactive gas into the processing region. The method further comprises reacting the reactive gas and the evaporated metallic material to deposit a ceramic separator layer on the surface of the electrode structure.
1. A method of forming an electrode structure, comprising:
exposing a metallic material to be deposited over a surface of a continuous protective layer formed on a pre-lithiation layer which is formed on a negative electrode positioned in a processing region to an evaporation process to form an evaporated metallic material;
flowing a reactive gas into the processing region, comprising:
flowing oxygen through a canister containing water vapor to form moist oxygen; and
introducing the moist oxygen into the processing region; and
reacting the reactive gas and the evaporated metallic material to deposit a ceramic layer on the surface of the continuous protective layer.
2. The method of claim 1 , wherein the metallic material is selected from the group consisting of: aluminum (Al), silver (Ag), chromium (Cr), copper (Cu), indium (In), iron (Fe), magnesium (Mg), nickel (Ni), tin (Sn), ytterbium (Yb), or a combination thereof.
3. The method of claim 1 , wherein the ceramic layer is an aluminum hydroxide oxide layer.
4. The method of claim 1 , wherein the evaporation process is a thermal evaporation process or an electron beam evaporation process.
5. The method of claim 1 , wherein the evaporation process comprises exposing the metallic material to a temperature of between 1,300 degrees Celsius and 1,600 degrees Celsius.
6. The method of claim 1 , wherein the ceramic layer is a binder-free ceramic layer.
7. The method of claim 1 , wherein the ceramic layer has a thickness in the range of 1 nanometer and 3,000 nanometers.
8. The method of claim 7 , wherein the ceramic layer has a thickness in the range of 10 nanometers to 500 nanometers.
9. The method of claim 1 , wherein the ceramic layer comprises boehmite.
10. The method of claim 1 , wherein the negative electrode is constructed from graphite or silicon-containing graphite.
11. The method of claim 1 , further comprising depositing a gel polymer layer on the ceramic layer.
12. The method of claim 11 , wherein the gel polymer layer is selected from polyvinylidene difluoride (PVDF), polyethylene oxide (PEO), poly-acrylonitrile (PAN), carboxymethyl cellulose (CMC), styrene butadiene rubber (SBR), or a combination thereof.
13. The method of claim 1 , wherein the continuous protective layer is made of lithium fluoride.
14. A method of forming a battery, comprising:
forming a negative electrode structure, comprising:
depositing a pre-lithiation layer on a surface of a negative electrode via a physical vapor deposition (PVD) process;
depositing a continuous protective layer on the pre-lithiation layer via a first evaporation process, wherein the continuous protective layer comprises lithium;
depositing a ceramic layer on a surface of the continuous protective layer, comprising:
exposing a metallic material to be deposited on the surface of the continuous protective layer positioned in a processing region to a second evaporation process to form an evaporated metallic material;
flowing a reactive gas into the processing region, comprising:
flowing oxygen through a canister containing water vapor to form moist oxygen; and
introducing the moist oxygen into the processing region; and
reacting the reactive gas and the evaporated metallic material to deposit the ceramic layer on the surface of the continuous protective layer, wherein flowing the reactive gas into the processing region comprises flowing moist oxygen into the processing region; and
joining the negative electrode structure with a positive electrode structure with the ceramic layer therebetween.
15. The method of claim 14 , wherein the ceramic layer is an aluminum hydroxide oxide layer.
16. The method of claim 14 , wherein the second evaporation process is a thermal evaporation process or an electron beam evaporation process.
17. A method of forming an electrode structure, comprising:
transferring a continuous sheet of material from a feed reel through a first processing region containing a first evaporation source, wherein the continuous sheet of material comprises a negative electrode structure comprising a negative electrode, a continuous protective layer, a pre-lithiation layer, and a current collector;
forming a ceramic layer over the continuous sheet of material, comprising:
exposing the continuous sheet of material to an evaporated metallic material from the first evaporation source in the first processing region; and
flowing a reactive gas into the first processing region, comprising:
flowing oxygen through a canister containing water vapor to form moist oxygen; and
introducing the moist oxygen into the first processing region; and
reacting the reactive gas and the evaporated metallic material to deposit the ceramic layer on the continuous protective layer.
18. The method of claim 17 , further comprising:
transferring the continuous sheet of material through a second processing region; and
depositing a gel polymer film on the ceramic layer in the second processing region.
19. The method of claim 18 , wherein the metallic material is selected from the group consisting of: aluminum (Al), silver (Ag), chromium (Cr), copper (Cu), indium (In), iron (Fe), magnesium (Mg), nickel (Ni), tin (Sn), ytterbium (Yb), or a combination thereof.
20. The method of claim 17 , wherein the ceramic layer is an aluminum hydroxide oxide layer.