Method and system for periodic deep discharge to extract lithium in silicon-dominant anodes
A method for periodic deep discharge to extract lithium in silicon-dominant anodes may include providing a cell comprising a cathode, a separator, and a silicon-dominant anode; charging and discharging the cell through a plurality of cycles; and, following the plurality of cycles, performing one or more deep discharge cycles, where each of the one or more deep discharge cycles comprises a cutoff voltage below a normal operating voltage range of the cell. The one or more deep discharge cycles may comprise a C/10 or lower or C/20 or lower discharge current. The one or more deep discharge cycles may include a cutoff voltage of 3.2 V or less, a cutoff voltage of 2.5 V or less, a cutoff voltage of 1.5 V or less, or a cutoff voltage of 1 V or less. The cell may be configured at a higher temperature during the one or more deep discharge cycles.
1 . A method of configuring battery performance, the method comprising:
providing a cell comprising a cathode, a separator, and a silicon-dominant anode;
charging and discharging the cell through a plurality of cycles or through regular use that is equivalent to a plurality of cycles; and
following the plurality of cycles or equivalent use, performing a capacity check cycle, wherein the capacity check cycle comprises one or both of charging at a charge rate below a normal charge rate, and discharging at a discharge rate below a normal discharge rate; and
based on the capacity check cycle, performing one or more deep discharge cycles,
wherein each of the one or more deep discharge cycles comprises using a discharge cutoff voltage outside of a normal operating voltage range of the cell and then resuming operation,
wherein the cell is discharged during at least one of the one or more deep discharge cycles at a first discharge rate that is different from a second discharge rate used during normal operations,
wherein the capacity check cycle is different from each of the one or more deep discharge cycles with respect to at least a minimum discharge cutoff voltage, and
wherein at least one of the one or more deep discharge cycles comprises a C/10 or lower discharge current.
2 . The method of claim 1 , wherein at least one of the one or more deep discharge cycles comprises a C/20 or lower discharge current.
3 . The method according to claim 1 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 3.2 V or less.
4 . The method according to claim 1 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 2.5 V or less.
5 . The method according to claim 1 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 1.5 V or less.
6 . The method according to claim 1 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 1 V or less.
7 . The method of claim 1 , comprising configuring the cell at a temperature of 30° C. or higher during at least one of the one or more deep discharge cycles.
8 . The method of claim 1 , comprising configuring the cell at a temperature of 40° C. or higher during at least one of the one or more deep discharge cycles.
9 . The method of claim 1 , comprising configuring at least one of the deep discharge cycle using a battery management system.
10 . The method of claim 9 , wherein the battery management system is integrated with the cell.
11 . The method of claim 9 , wherein the battery management system is external to the cell.
12 . The method of claim 1 , comprising performing the one or more deep discharge cycles periodically.
13 . A method of configuring battery performance, the method comprising:
providing a cell comprising a cathode, a separator, and a silicon-dominant anode;
charging and discharging the cell through a plurality of cycles or through regular use where the usage is equivalent to a plurality of cycles; and
following the plurality of cycles or equivalent use, performing a capacity check cycle, wherein the capacity check cycle comprises one or both of charging at a charge rate below a normal charge rate, and discharging at a discharge rate below a normal discharge rate; and
based on the capacity check cycle, performing one or more deep discharge cycles,
wherein each of the one or more deep discharge cycles comprises a discharge cutoff voltage outside of a normal operating voltage range of the cell and a cell temperature configured above room temperature and then resuming operation where the cell is allowed to discharge to a shallower depth of discharge;
wherein the cell is discharged during at least one of the one or more deep discharge cycles at a first discharge rate that is different from a second discharge rate used during normal operations; and
wherein the capacity check cycle is different from each of the one or more deep discharge cycles with respect to at least a minimum discharge cutoff voltage; and
wherein performing at least one of the one or more deep discharge cycles comprises using a voltage taper after the cell reaches a particular cutoff voltage, and wherein the voltage taper is applied until a current discharged from the cell reaches a pre-determined end of taper C-rate based value.
14 . The method of claim 13 , wherein performing the at least one of the one or more deep discharge cycles further comprises controlling a temperature of the cell, the controlling comprising setting the temperature to a predetermined value during at least a portion of the voltage taper.
15 . A method of configuring battery performance, the method comprising:
providing a cell comprising a cathode, a separator, and a silicon-dominant anode;
charging and discharging the cell through a plurality of cycles or through regular use that is equivalent to a plurality of cycles; and
following the plurality of cycles or equivalent use, performing a capacity check cycle, wherein the capacity check cycle comprises one or both of charging at a charge rate below a normal charge rate, and discharging at a discharge rate below a normal discharge rate; and
based on the capacity check cycle, performing one or more deep discharge cycles,
wherein each of the one or more deep discharge cycles comprises using a discharge cutoff voltage outside of a normal operating voltage range of the cell and then resuming operation,
wherein the cell is discharged during at least one of the one or more deep discharge cycles at a first discharge rate that is different from a second discharge rate used during normal operations,
wherein the capacity check cycle is different from each of the one or more deep discharge cycles with respect to at least a minimum discharge cutoff voltage, and
wherein at least one of the one or more deep discharge cycle comprises a taper where the cell is held at the discharge cutoff voltage until the discharge current decreases to C/20.
16 . The method according to claim 15 , wherein at least one of the one or more deep discharge cycles comprises a C/20 or lower discharge current.
17 . The method according to claim 15 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 3.2 V or less.
18 . The method according to claim 15 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 2.5 V or less.
19 . The method according to claim 15 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 1.5 V or less.
20 . The method according to claim 15 , wherein at least one of the one or more deep discharge cycles comprises a cutoff voltage of 1 V or less.
21 . The method of claim 15 , comprising configuring the cell at a temperature of 30° C. or higher during at least one of the one or more deep discharge cycles.
22 . The method of claim 15 , comprising configuring the cell at a temperature of 40° C. or higher during at least one of the one or more deep discharge cycles.
23 . The method of claim 15 , comprising configuring at least one of the deep discharge cycle using a battery management system.
24 . The method of claim 23 , wherein the battery management system is integrated with the cell.
25 . The method of claim 23 , wherein the battery management system is external to the cell.
26 . The method of claim 15 , comprising performing the one or more deep discharge cycles periodically.
27 . A method of configuring battery performance, the method comprising:
providing a cell comprising a cathode, a separator, and a silicon-dominant anode;
charging and discharging the cell through a plurality of cycles or through regular use where the usage is equivalent to a plurality of cycles; and
following the plurality of cycles or equivalent use, performing a capacity check cycle, wherein the capacity check cycle comprises one or both of charging at a charge rate below a normal charge rate, and discharging at a discharge rate below a normal discharge rate; and
based on the capacity check cycle, performing one or more deep discharge cycles,
wherein each of the one or more deep discharge cycles comprises a discharge cutoff voltage outside of a normal operating voltage range of the cell and a cell temperature configured above room temperature and then resuming operation where the cell is allowed to discharge to a shallower depth of discharge;
wherein the cell is discharged during at least one of the one or more deep discharge cycles at a first discharge rate that is different from a second discharge rate used during normal operations;
wherein the capacity check cycle is different from each of the one or more deep discharge cycles with respect to at least a minimum discharge cutoff voltage; and
wherein performing at least one of the one or more deep discharge cycles comprises using a voltage taper after the cell reaches a particular cutoff voltage, wherein the voltage taper is applied until a current discharged from the cell reaches a pre-determined end of taper C-rate based value, and setting the cell temperature to a predetermined value during at least a portion of the voltage taper.