Polymer solid electrolytes, methods of making, and electrochemical cells comprising the same
Disclosed are various polymer solid electrolyte materials suitable for various electrochemical devices and methods for making or using the same. The polymer solid electrolyte comprises a crosslinked polymer from a polymer. Certain embodiments are generally directed to solid electrolytes having relatively high ionic conductivity and/or other mechanical or electrical properties, e.g., tensile strength or decomposition potential. Certain aspects include a polymer, a plasticizer, and an electrolyte salt. In some cases, the polymer for synthesizing the crosslinked polymer may exhibit certain structures such as: where R 1 can be one of the following groups: where n is an integer between 1 and 10000, m is an integer between 1 and 5000, and R 2 to R 6 are each independently selected from the group consisting of hydrogen, methyl, ethyl, phenyl, benzyl, acryl, epoxy ethyl, isocyanate, cyclic carbonate, lactone, lactam, and vinyl; and * indicates a point of attachment.
1. An electrolyte comprising an electrolyte salt and a crosslinked polymer obtained by a crosslinking reaction including one or more monomers selected from the group consisting of:
wherein R 1 comprises a structure selected from the group consisting of:
wherein n is an integer between 1 and 10,000, inclusively; m is an integer between 1 and 5,000, inclusively; R 2 , R 3 , R 4 , R 5 , and R 6 are each independently selected from the group consisting of hydrogen, methyl, ethyl, phenyl, benzyl, acryl, epoxy ethyl, isocyanate, cyclic carbonate, lactone, lactam, and vinyl; and * indicates a point of attachment.
2. The electrolyte of claim 1 , further comprising a plasticizer.
3. The electrolyte of claim 2 , wherein the plasticizer comprises cyclic carbonate, oligoether, succinonitrile, polyethylene oxide, polycarbonate, polyacrylonitrile, polyactic acid, ionic liquid, nitrile, sulfolane, trimethyl phosphate or a combination thereof.
4. The electrolyte of claim 3 , wherein the nitrile is selected from the group consisting of succinonitrile, glutaronitrile, hexonitrile, malononitrile and a mixture thereof, the oligoether is a triglyme, wherein the cyclic carbonate is selected from the group consisting of ethylene carbonate, propylene carbonate, fluoroethylene carbonate and a mixture thereof.
5. The electrolyte of claim 1 , wherein the electrolyte salt comprises a lithium salt selected from the group consisting of LiTFSI, LiFSI, LiBOB, LiPF 6 , LiBF 4 , LiClO 4 , LiAsF 6 , LiN(CF 3 SO 2 ) 2 , LiC(CF 3 SO 2 ) 3 , LiDFOB, LiF, LiCl, LiBr, LiI, Li 2 SO 4 , LiNO 3 , Li 3 PO 4 , Li 2 CO 3 , LiOH, lithium acetate, lithium trifluoromethyl acetate, lithium oxalate and a mixture thereof.
6. The electrolyte of claim 1 , further comprising a cathode protective agent, an anode protective agent, an anti-oxidative agent, or a mixture thereof.
7. The electrolyte of claim 6 , wherein the cathode protective agent comprises LiDFOB (lithium difluoro(oxalato)borate).
8. The electrolyte of claim 6 , wherein the anode protective agent comprises fluoroethylene carbonate.
9. The electrolyte of claim 8 , wherein the anti-oxidative agent comprises LiBOB (lithium bis(oxalate)borate.
10. The electrolyte of claim 1 , wherein the electrolyte is a polymer solid electrolyte.
11. The electrolyte of claim 1 , wherein the electrolyte comprises a network-type microphase-separated structure.
12. The electrolyte of claim 1 , wherein the electrolyte possesses an ion transference number in a range from 0.1 to 1.0.
13. The electrolyte of claim 1 , wherein the crosslinked polymer is obtained by a crosslinking reaction including the one or more monomers and a second monomer.
14. The electrolyte of claim 13 , wherein the second monomer is selected from the group consisting of
wherein R 1 comprises a structure selected from the group consisting of:
wherein n is an integer between 1 and 10,000, inclusively; m is an integer between 1 and 5,000, inclusively; R 2 , R 3 , R 4 , R 5 , and R 6 are each independently selected from the group consisting of hydrogen, methyl, ethyl, phenyl, benzyl, acryl, epoxy ethyl, isocyanate, cyclic carbonate, lactone, lactam, and vinyl; and * indicates a point of attachment.
15. The electrolyte of claim 13 , wherein the second monomer is selected from the group consisting of methacrylate, norbornyl methacrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-aminoethyl methacrylate hydrochloride, glycidyl methacrylate, 2-(diethylamino)ethyl methacrylate, and a mixture thereof.
16. An electrochemical cell comprising the electrolyte of claim 1 .
17. A method for preparing an electrolyte comprising a crosslinked polymer, comprising:
a) mixing a composition comprising one or more monomers and an electrolyte salt to form a slurry; and
b) curing the one or more monomers in the slurry into a crosslinked polymer, leading to an electrolyte comprising the crosslinked polymer with the electrolyte salt therein,
wherein the one or more monomers are selected from the group consisting of:
wherein R 1 comprises a structure selected from the group consisting of:
wherein n is an integer between 1 and 10,000, inclusively; m is an integer between 1 and 5,000, inclusively; R 2 , R 3 , R 4 , R 5 , and R 6 are each independently selected from the group consisting of hydrogen, methyl, ethyl, phenyl, benzyl, acryl, epoxy ethyl, isocyanate, cyclic carbonate, lactone, lactam, and vinyl; and * indicates a point of attachment.
18. The method of claim 17 , wherein the composition further comprises a solvent.
19. The method of claim 18 , wherein the solvent comprises at least one selected from the group consisting of distilled water, methanol, ethanol, pyridine, chloroform, and a mixture thereof.
20. A composition for preparing the electrolyte of claim 1 , wherein the composition comprises one or more monomers selected from the group consisting of:
wherein R 1 comprises a structure selected from the group consisting of:
wherein n is an integer between 1 and 10,000, inclusively; m is an integer between 1 and 5,000, inclusively; R 2 , R 3 , R 4 , R 5 , and R 6 are each independently selected from the group consisting of hydrogen, methyl, ethyl, phenyl, benzyl, acryl, epoxy ethyl, isocyanate, cyclic carbonate, lactone, lactam, and vinyl; and * indicates a point of attachment.