Non-aqueous electrolytic solutions and electrochemical cells comprising the same
View Patent ↗Non-aqueous electrolyte solutions capable of protecting negative electrode materials such as lithium metal and carbonaceous materials in energy storage electrochemical cells (e.g., lithium metal batteries, lithium ion batteries and supercapacitors) include an electrolyte salt, a non-aqueous electrolyte solvent mixture, an unsaturated organic compound 4-methylene-1,3-dioxolan-2-one or 4,5-dimethylene-1,3-dioxolan-2-one, and other optional additives. The 1,3-dioxolan-2-ones help to form a good solid electrolyte interface on the negative electrode surface.
1. A secondary battery comprising:
a. an anode,
b. a cathode, and,
c. an electrolytic solution, comprising a non-aqueous electrolytic solvent selected from the group consisting of 4-methylene-1,3-dioxolan-2-one, 4,5-dimethylene-1,3-dioxolan-2-one, and combinations thereof.
2. The secondary battery of claim 1 , wherein the electrolytic solution further comprises a salt selected from the group consisting of LiPF 6 , LiBF 4 , LiSbF 6 , LiAsF 6 , LiTaF 6 , LiAlCl 4 , Li 2 B 10 Cl 10 , Li 2 B 12 F x H (12-x) wherein x=0-12, LiB(C 2 O 4 ) 2 , LiB(O 2 CCH 2 CO 2 ) 2 , LiB(O 2 CCF 2 CO 2 ) 2 , LiB(C 2 O 4 )(O 2 CCH 2 CO) 2 ), LiB(C 2 O 4 )(O 2 CCF 2 CO 2 ), LiP(C 2 O 4 ) 3 , LiP(O 2 CCF 2 CO 2 ) 3 , LiClO 4 , LiCF 3 SO 3 ; LiN(SO 2 C m F 2m+1 )(SO 2 C n F 2n+1 ), LiC(SO 2 C k F 2k+1 )(SO 2 C m F 2m+1 )(SO 2 C n F 2n+1 ), wherein k=1-10, m=1-10, and n=1-10, respectively; LiN(SO 2 C p F 2p SO 2 ), and LiC(SO 2 C p F 2p SO 2 )(SO 2 C q F 2q+1 ) wherein p=1-10 and q=1-10; LiPF x (R F ) 6-x and LiBF y (R F ) 4-y , wherein RF represents perfluorinated C 1 -C 20 alkyl groups or perfluorinated aromatic groups, x=0-5, and y=0-3; LiBF 2 [O 2 C(CX 2 ) n CO 2 ], LiPF2[O 2 C(CX 2 ) n CO 2 ), LiPF 4 [O 2 C(CX 2 ) n CO 2 ], wherein X is selected from the group consisting of H, F, Cl, C 1 -C 4 alkyl groups and fluorinated alkyl groups, and n=0-4; and combinations thereof.
3. The secondary battery of claim 1 , wherein the electrolytic solution further comprises a non-aqueous solvent selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, diethyl carbonate, di(2,2,2-trifluoroethyl) carbonate, dipropyl carbonate, dibutyl carbonate, ethyl methyl carbonate, 2,2,2-trifluoroethyl methyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, 2,2,2-trifluoroethyl propyl carbonate, methyl formate, ethyl formate, propyl formate, butyl formate, methyl acetate, ethyl acetate, propyl acetate, butyl acetate, methyl propionate, ethyl propionate, propyl propionate, butyl propionate, methyl butyrate, ethyl butyrate, propyl butyrate, butyl butyrate, tetrahydrofuran, 2-methyl tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, 1,2-dimethoxyethane, 1,2-diethoxyethane, 1,2-dibutoxyethane, acetonitrile, dimethylformamide, γ-butyrolactone, 2-methyl-γ-butyrolactone, 3-methyl-γ-butyrolactone, 4-methyl-γ-butyrolactone, -propiolactone, 8-valerolactone, trimethyl phosphate, triethyl phosphate, tris(2-chloroethyl) phosphate, tris(2,2,2-trifluoroethyl) phosphate, tripropyl phosphate, triisopropyl phosphate, tributylphosphate, trihexyl phosphate, triphenyl phosphate, tritolyl phosphate, methyl ethylenephosphate, ethyl ethylene phosphate, dimethyl sulfone, ethyl methyl sulfone, methyltrifluoromethyl sulfone, ethyl trifluoromethyl sulfone, methyl pentafluoroethyl sulfone, ethyl pentafluoroethyl sulfone, di(trifluoromethyl) sulfone, di(pentafluoroethyl) sulfone, trifluoromethyl pentafluoroethyl sulfone, trifluoromethyl nonafluorobutyl sulfone, pentafluoroethyl nonafluorobutyl sulfone, acetonitrile, propionitrile, butyronitrile N,N-dimethylformamide, N,N-dimethyl acetamide, N,N-diethyl acetamide, N,N-dimethyl trifluoroacetamide and combinations thereof.
4. The secondary battery of claim 1 , wherein the cathode comprises a lithium mixed metal oxide selected from the group consisting of LiCoO 2 , LiMnO 2 , LiMn 2 O 4 , Li 2 Cr 2 O 7 , Li 2 CrO 4 , LiNiO 2 , LiFeO 2 , LiNi x Co 1-x O 2 (0<x<1), LiFePO 4 , LiVPO 4 , LiMn 0.5 Ni 0.5 O 2 , LiNi 1/3 Mn 1/3 Co 1/3 )O 2 , LiMe 0.5 Mn 1.5 O 4 wherein Me is a divalent metal, LiNi x Co y Me z O 2 wherein Me is selected from the group consisting of Al, Mg, Ti, B, Ga, and Si, and combinations thereof, and 0<x,y,z<1, and mixtures thereof.
5. The secondary battery of claim 4 , wherein the cathode further comprises a binder selected from the group consisting of polyvinylidene fluoride, styrene-butadiene rubber, polyamide, melamine, and combinations thereof.
6. The secondary battery of claim 1 , wherein the anode comprises a material selected from the group consisting of carbonaceous material, lithium metal, LiMnO 2 , LiAl, LiZn, Li 3 Bi, Li 3 Cd, Li 3 Sd, Li 4 Si, Li 4.4 Pb, Li 4.4 Sn, LiC 6 , Li 3 FeN 2 , Li 2.6 Co 0.4 N, Li 2.6 Cu 0.4 N, Li 4 Ti 5 O 12 , and combinations thereof.
7. The secondary battery of claim 6 , wherein the anode further comprises a binder selected from the group consisting of polyvinylidene fluoride, styrene-butadiene rubber, polyamide, melamine, and combinations thereof.
8. The secondary battery of claim 1 , wherein the electrolytic solution further comprises a salt selected from the group consisting of LiPF 6 , LiBF4, and combinations thereof.
9. The secondary battery of claim 1 wherein the non-aqueous electrolytic solution comprises:
a. ethylene carbonate, dimethyl carbonate and ethylmethyl carbonate;
b. LiPF 6 ;
c. at least one of 4-methylene-1,3-dioxolan-2-one and 4,5-dimethylene-1,3-dioxolan-2-one; and
d. a composition having Chemical Abstracts Service Registry Number 204933-93-7.
10. A secondary battery comprising an anode, a cathode, and an electrolytic solution, wherein the electrolytic solution comprises an unsaturated organic compound selected from the group consisting of 4-methylene-1,3-dioxolan-2-one, 4,5-dimethylene-1,3-dioxolan-2-one, and combinations thereof, provided that the total concentration of 4-methylene-1,3-dioxolan-2-one and 4,5-dimethylene-1,3-dioxolan-2-one in the solution does not exceed about 10 wt % of the electrolytic solution.
11. The secondary battery of claim 10 , wherein the total concentration of 4-methylene-1,3-dioxolan-2-one and 4,5-dimethylene-1,3-dioxolan-2-one in the solution does not exceed about 4 wt % of the electrolytic solution.
12. The secondary battery of claim 10 , wherein the anode comprises a material selected from the group consisting of carbonaceous material, lithium metal, LiMnO 2 , LiAl, LiZn, Li 3 Bi, Li 3 Cd, Li3Sb, Li 4 Si, Li 4.4 Pb, Li 4.4 Sn, LiC 6 , Li 3 FeN 2 , Li 2.6 Co 0.4 N, Li 2.6 Cu 0.4 N, Li 4 Ti 5 O 12 , and combinations thereof.
13. The secondary battery of claim 10 , wherein the anode comprises a first material selected from the group consisting of carbonaceous material, lithium metal, LiMnO 2 , LiAl, LiZn, Li 3 Bi, Li 3 Cd, Li 3 Sb, Li 4 Si, Li 4.4 Pb, Li 4.4 Sn, LiC 6 , Li 3 FeN 2 , Li 2.6 Co 0.4 N, Li 2.6 Cu 0.4 N, Li 4 Ti 5 O 12 , and combinations thereof, and a second material selected from the group consisting of SnO, SnO 2 , GeO, GeO 2 , In 2 O, In 2 O 3 , PbO, PbO 2 , Pb 2 O 3 , Pb 3 O 4 , Ag 2 O, AgO, Ag 2 O 3 , Sb 2 O 3 , Sb 2 O 4 , Sb 2 O 5 , SiO, ZnO, CoO, NiO, FeO, and combinations thereof.