Electrodes for lithium-ion batteries and other
The present disclosure generally relates to various electrodes suitable for electrochemical devices such as batteries, capacitors, sensors, condensers, electrochromic elements, photoelectric conversion elements, etc. Some embodiments are generally directed to electrode materials surrounded by electrolyte, e.g., filling in porous spaces within the electrode. For example, one aspect is generally directed to an electrochemical device comprising an electrode comprising particles. Some or all of the particles may be surrounded by an electrolyte, such as a solid electrolyte. Other aspects of the invention are generally directed to devices including such electrodes, methods of making or using such electrodes, kits including such electrodes, or the like.
1. An electrode layer for an electrochemical device, comprising particles of an electroactive material and a polymer solid electrolyte comprising a crosslinked polymer, wherein the particles are embedded in the polymer solid electrolyte and the polymer solid electrolyte has a weight percentage of 5%-40% in the electrode layer, wherein the polymer solid electrolyte is obtained by crosslinking a mixture comprising poly(ethylene glycol) diacrylate and (lithium bis(trifluoromethanesulfonyl) imide (LiTFSI).
2. The electrode layer of claim 1 , wherein at least 50% of the particles are in contact with the polymer solid electrolyte.
3. The electrode layer of claim 1 , wherein the polymer solid electrolyte fills at least 50 vol % of interstices among the particles.
4. The electrode layer of claim 1 , wherein the electroactive material comprises one or more selected from the group consisting of lithium nickel cobalt manganese oxide, lithium nickel cobalt manganese aluminum oxide, lithium nickel cobalt aluminum oxide, lithium titanate, metallic lithium, lithium metal oxide, lithium manganese oxide, lithium cobalt oxide, and lithium iron phosphate.
5. The electrode layer of claim 1 , wherein the particles of the electroactive material have a D50 value ranging from 3.0 micrometers to 10 micrometers.
6. An assembly for an electrochemical device, comprising an electrode layer and an electrolyte layer, wherein the electrode layer comprises particles of an electroactive material and a polymer solid electrolyte comprising a crosslinked polymer, wherein the particles are embedded in the polymer solid electrolyte, and the polymer solid electrolyte extends from the electrode layer to the electrolyte layer, wherein the polymer solid electrolyte is obtained by crosslinking a mixture comprising poly(ethylene glycol) diacrylate and (lithium bis(trifluoromethanesulfonyl) imide (LiTFSI).
7. The assembly of claim 6 , wherein the polymer solid electrolyte has a weight percentage of 5%-40% in the electrode layer.
8. The assembly of claim 6 , wherein the electrolyte layer has a thickness ranging from 20 μm to 1000 μm.
9. The assembly of claim 6 , wherein the polymer solid electrolyte fills at least 50 vol % of interstices among the particles in the electrode layer.
10. The assembly of claim 6 , wherein the electrolyte layer exhibits an ionic conductivity of at least 1×10 −4 S/m and the electrode layer exhibits a decomposition potential of at least 3.0 V.
11. An electrochemical device, comprising:
1) the electrode layer of claim 1 comprising the polymer solid electrolyte, and
2) an electrolyte layer adjacent to the electrode layer, wherein the electrolyte layer is formed by extending the polymer solid electrolyte from the electrode layer to the electrolyte layer.
12. The electrochemical device of claim 11 , wherein the electrode layer is a cathode layer comprising electroactive materials for cathode.
13. A method of preparing the electrode layer of claim 1 , comprising:
1) providing an untreated electrode layer comprising the particles of the electroactive material;
2) mixing a composition comprising one or more crosslinkable monomers and an electrolyte salt to form an electrolyte mixture at room temperature, wherein the one or more crosslinkable monomers comprise poly(ethylene glycol) diacrylate and the electrolyte salt comprises (lithium bis(trifluoromethanesulfonyl) imide (LiTFSI);
3) soaking the untreated electrode layer in the electrolyte mixture, leading to a soaked layer; and
4) crosslinking the one or more crosslinkable monomers in the soaked layer into the crosslinked polymer, transforming the electrolyte mixture in the soaked layer from liquid state to solid state, forming the electrode layer of claim 1 , wherein the particles are embedded in the polymer solid electrolyte.
14. The method of claim 13 , wherein the untreated electrode layer is prepared by:
1) mixing the particles of the electroactive material, a binder and a carbon material to form a mixture;
2) milling the mixture from step 1) in a ball mill, leading to a slurry;
3) applying the slurry to a supporting substrate to form a uniform coating; and
4) drying the uniform coating, forming the untreated electrode layer.
15. The method of claim 13 , wherein the one or more crosslinkable monomers are crosslinked via a thermal crosslinking or by exposure to UV light in the presence or absence of an initiator.
16. The method of claim 13 , wherein the electrolyte mixture after step 2) comprises a solvent and the solvent is removed after step 4).
17. A method of preparing the assembly of claim 6 , comprising:
1) providing an untreated electrode layer comprising the particles of the electroactive material;
2) mixing a composition comprising one or more crosslinkable monomers and an electrolyte salt to form an electrolyte mixture at room temperature;
3) soaking the untreated electrode layer in the electrolyte mixture, leading to a soaked layer;
4) applying the soaked layer to the electrolyte mixture forming a coating on the soaked layer; and
5) crosslinking the one or more crosslinkable monomers in both the soaked layer and the coating into the crosslinked polymer, transforming the electrolyte mixture into the polymer solid electrolyte, forming the assembly of claim 5 comprising the electrode layer and the electrolyte layer, wherein the particles are embedded in the polymer solid electrolyte in the electrode layer, and the polymer solid electrolyte extends from the electrode layer to the electrolyte layer.