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US 12,756,002 B2Granted
Method for activation of lithium secondary battery
AssigneeLG Energy Solution, Ltd.
InventorsSang Jih Kim, Nak Gi Sung, Eui Kyung Lee, Suk Hyun Hong
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Abstract
A method of activating a lithium secondary battery includes a pressurization process pressurizing the lithium secondary battery while changing pressure at one or two or more time periods selected from before an activation process, after the activation process, and between activation steps of the activation process.
Claims15
A method for activating a lithium secondary battery, comprising:
- an activation process pressurizing and charging the lithium secondary battery, the activation process comprising n number of activation steps, wherein n is an integer of 3 or more, and wherein each of the activation steps has different activation conditions that include one or more selected from a charge end state of charge (SOC), a charging speed (C-rate), and a pressure applied to the lithium secondary battery;
- and
- a pressurization process pressurizing the lithium secondary battery while changing a pressure, the pressurization process occurring during one or more time periods selected from before the activation process, after the activation process, and between the activation steps,
- wherein the pressurization process comprises:
- a first pressurization step pressurizing the lithium secondary battery at a pressure of 0.1 kgf/cm2 to 1.0 kgf/cm2;
- and
- a second pressurization step pressurizing the lithium secondary battery at a pressure of 2.5 kgf/cm2 to 7.5 kgf/cm2,
- wherein the first pressurization step and the second pressurization step are sequentially performed.
5 more elements
A method for activating a lithium secondary battery, comprising:
- an activation process pressurizing and charging the lithium secondary battery, the activation process comprising n number of activation steps, wherein n is an integer of 3 or more, and wherein each of the activation steps has different activation conditions that include one or more selected from a charge end state of charge (SOC), a charging speed (C-rate), and a pressure applied to the lithium secondary battery;
- and
- a pressurization process pressurizing the lithium secondary battery while changing a pressure, the pressurization process occurring during one or more time periods selected from before the activation process, after the activation process, and between the activation steps,
- wherein the activation steps include:
- a first activation step in which a pressure applied to the lithium secondary battery during charging is 0.1 kgf/cm2 to 1.0 kgf/cm2;
- and
- a second activation step in which the pressure applied to the lithium secondary battery during charging is 2.5 kgf/cm2 to 7.5 kgf/cm2,
- wherein the first activation step precedes the second activation step.
5 more elements
A method for activating a lithium secondary battery, comprising:
- an activation process pressurizing and charging the lithium secondary battery, the activation process comprising n number of activation steps, wherein n is an integer of 3 or more, and wherein each of the activation steps has different activation conditions that include one or more selected from a charge end state of charge (SOC), a charging speed (C-rate), and a pressure applied to the lithium secondary battery;
- and
- a pressurization process pressurizing the lithium secondary battery while changing a pressure, the pressurization process occurring during one or more time periods selected from before the activation process, after the activation process, and between the activation steps,
- wherein the activation steps include:
- a first activation step charging the lithium secondary battery to below SOC 10%;
- a second activation step charging the lithium secondary battery which has undergone the first activation step to SOC 10% to 30%;
- a third activation step charging the lithium secondary battery which has undergone the second activation step to SOC 35% to 50%;
- and
- a fourth activation step charging the lithium secondary battery which has undergone the third activation step to SOC more than 50% to 70%.
6 more elements
Dependencies are inferred from the claim text.