Voltage cycling method for lithium ion battery comprising sulfur polymer composite in active material
First Claim
1. A method for cycling a sulfur composite lithium ion battery, the method comprising a step of charging and discharging the sulfur composite lithium ion battery at a first voltage range having a predetermined highest voltage and a predetermined lowest voltage, wherein the sulfur composite lithium ion battery comprises a cathode active material and an anode active material, the cathode active material comprising a sulfur composite, the sulfur composite is a sulfur based polymer, the anode active material is lithium metal, the first voltage range is smaller than and located in a range having a charge cutoff voltage and a discharge cutoff voltage, the charge cutoff voltage is 3V, and the discharge cutoff voltage is 0V, the first voltage range is 30% to 50% smaller than the range from 0V to 3V, and the step of charging and discharging satisfies at least one condition of (1) and (2):
- (1) the predetermined lowest voltage of the first voltage range is larger than the discharge cutoff voltage of the sulfur composite; and
(2) the predetermined highest voltage of the first voltage range is smaller than the charge cutoff voltage of the sulfur composite,wherein the cycling the sulfur composite lithium ion battery is defined as;
when a voltage of the sulfur composite lithium ion battery is charged to the predetermined highest voltage, the charging stops;
when the voltage of the sulfur composite lithium ion battery is discharged to the predetermined lowest voltage, the discharging stops; and
the sulfur composite lithium ion battery is not charged above the charge cutoff voltage and the sulfur composite lithium ion battery is not discharged below the discharge cutoff voltage.
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Abstract
A method for cycling a sulfur composite lithium ion battery includes a step of charging and discharging the sulfur composite lithium ion battery at a first voltage range between a predetermined highest voltage and a predetermined lowest voltage. The lithium ion battery includes an electrode active material. The electrode active material includes a sulfur composite. The step of charging and discharging satisfies at least one conditions of (1) and (2): (1) the predetermined lowest voltage of the first voltage range is larger than a discharge cutoff voltage of the sulfur composite; and (2) the predetermined highest voltage of the first voltage range is smaller than a charge cutoff voltage of the sulfur composite. A method for using a sulfur composite as an electrode active material of a lithium ion battery is also disclosed.
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Citations
13 Claims
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1. A method for cycling a sulfur composite lithium ion battery, the method comprising a step of charging and discharging the sulfur composite lithium ion battery at a first voltage range having a predetermined highest voltage and a predetermined lowest voltage, wherein the sulfur composite lithium ion battery comprises a cathode active material and an anode active material, the cathode active material comprising a sulfur composite, the sulfur composite is a sulfur based polymer, the anode active material is lithium metal, the first voltage range is smaller than and located in a range having a charge cutoff voltage and a discharge cutoff voltage, the charge cutoff voltage is 3V, and the discharge cutoff voltage is 0V, the first voltage range is 30% to 50% smaller than the range from 0V to 3V, and the step of charging and discharging satisfies at least one condition of (1) and (2):
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(1) the predetermined lowest voltage of the first voltage range is larger than the discharge cutoff voltage of the sulfur composite; and (2) the predetermined highest voltage of the first voltage range is smaller than the charge cutoff voltage of the sulfur composite, wherein the cycling the sulfur composite lithium ion battery is defined as; when a voltage of the sulfur composite lithium ion battery is charged to the predetermined highest voltage, the charging stops; when the voltage of the sulfur composite lithium ion battery is discharged to the predetermined lowest voltage, the discharging stops; and the sulfur composite lithium ion battery is not charged above the charge cutoff voltage and the sulfur composite lithium ion battery is not discharged below the discharge cutoff voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for cycling a sulfur composite lithium ion battery, the lithium ion battery comprising a cathode active material and an anode active material, the cathode active material comprising a sulfur composite, the sulfur composite is a sulfur based polymer, the anode active material is lithium metal, and the method comprising:
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S1, charging and discharging the lithium ion battery at a first voltage range having a first predetermined highest voltage and a first predetermined lowest voltage, wherein when a voltage of the lithium ion battery is charged to the first predetermined highest voltage, the charging stops, and when the voltage of the lithium ion battery is discharged to the first predetermined lowest voltage, the discharging stops; and S2, after the step S1, charging and discharging the lithium ion battery at a second voltage range having a second predetermined highest voltage and a second predetermined lowest voltage, wherein the second predetermined highest voltage of the second voltage range is smaller than or equal to 3V, and the second predetermined lowest voltage of the second voltage range is larger than or equal to 0V, when the voltage of the lithium ion battery is charged to the second predetermined highest voltage, the charging stops, and when the voltage of the sulfur composite lithium ion battery is discharged to the second predetermined lowest voltage, the discharging stops; wherein the step S1 satisfies at least one condition of (1) and (2); (1) the first predetermined lowest voltage of the first voltage range is larger than the second predetermined lowest voltage of the second voltage range, the first predetermined highest voltage of the first voltage range is smaller than or equal to the second predetermined highest voltage of the second voltage range; and (2) the first predetermined highest voltage of the first voltage range is smaller than the second predetermined highest voltage of the second voltage range, the first predetermined lowest voltage of the first voltage range is larger than or equal to the second predetermined lowest voltage of the second voltage range. - View Dependent Claims (12, 13)
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Specification