Method for making electrochemical cells
A method for making a lithium battery or lithium ion battery having nitrogen silylated compounds as additives in a nonaqueous electrolytic solution. Batteries using this electrolytic solution have long cycle life and high capacity retention.
1. A method of making a lithium battery or lithium ion battery comprising:
a. providing an electrolytic solution comprising
i. a non-aqueous electrolytic solvent and
ii. a lithium containing salt, and
iii. from about 0.05 to about 10% wt % of a nitrogen silylated additive having the formula
wherein R 1 , R 2 , and R 3 are each independently selected from the group consisting of hydrogen, halogen, C 1 -C 20 alkyl, C 1 -C 20 alkenyl, and aryl residue, wherein X and Y are each independently selected from the group consisting of hydrogen, halogen, C 1 -C 20 alkyl, C 1 -C 20 alkenyl, aryl, —O—, —S—, —CO—, —CO 2 —, —SO—, —SO 2 —, —NR 9 —, —NR 10 R 11 , PR 12 —, and —Si(R 13 R 14 )—, wherein R 9 to R 14 are each independently selected from the group consisting of hydrogen, halogen, C 1 -C 20 alkyl, C 1 -C 20 alkenyl, and aryl, and wherein Z is selected from the group consisting of nothing, a direct bond between X and Y, —O—, —S—, —CO—, —CO 2 —, —SO—, —SO 2 —, —N(R 15 )—, —NR 16 R 17 , —PR 18 —, —Si(R 19 R 20 )—, and —[C(R 21 ) 2 ] m —, wherein R 15 to R 21 are each independently selected from the group consisting of hydrogen, halogen, C 1 -C 20 alkyl, C 1 -C 20 alkenyl, and aryl, and m is a number from 1 to 6,
b. laminating and winding a cathode, a first porous separator, an anode, and a second porous separator to form a wound laminated electrode,
c. placing the wound laminated electrodes and separators in a battery case,
d. infusing the electrolytic solution into the battery case, and
e. sealing the battery case containing the laminated electrode, and electrolytic solution and separators.
2. The method of claim 1 wherein at least one of R 1 , R 2 , or R 3 , further comprises a substituent selected from the group consisting of —O—, —S—, CO—, —CO 2 —, —SO—, —SO 2 —, —NR 4 R 5 , —PR 6 —, and —Si(R 7 R 8 )—, wherein R 4 to R 8 are each independently selected from the group consisting of hydrogen, halogen, C 1 -C 20 alkyl, alkenyl, and aryl.
3. The method of claim 1 wherein at least one of R 4 to R 8 further comprises a substituent selected from the group consisting of —O—, —S—, —CO—, —CO 2 —, —SO—, —SO 2 —, amine, phosphorous linkage and silica linkage.
4. The method of claim 1 wherein R 1 , R 2 , and R 3 are C 1 -C 12 residues.
5. The method of claim 1 wherein at least one of X, Y, or Z further comprises a substituent selected from the group consisting of —O—, —S—, CO—, —CO 2 —, —SO—, —SO 2 —, —N 9 —, —NR 10 R 11 , —PR 12 —, and —Si(R 13 R 14 )—, wherein R 9 to R 14 are each independently selected from the group consisting of hydrogen, halogen, C 1 -C 20 alkyl, C 1 -C 20 alkenyl, and aryl.