First-time charging forming method for lithium-ion secondary battery

A technology of secondary battery and chemical formation method, applied in secondary battery charging/discharging, secondary battery repair/maintenance, non-aqueous electrolyte storage battery, etc., to ensure cycle life and safety performance, improve cycle performance, and avoid negative electrode lithium precipitation Effect

Inactive Publication Date: 2013-06-12
湖北力莱科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, it is necessary to provide a method for the formation of the first charge of lithium-ion secondary batteries, which effectively overcomes the first-time problems in the prior art by improving the process and parameters of the formation of lithium-ion secondary batteries for the first time. The problem that th

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  • First-time charging forming method for lithium-ion secondary battery

Examples

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Example Embodiment

[0018] Embodiment 1, the first charging formation method of a lithium ion secondary battery provided in this embodiment includes the following steps: the first step, the lithium ion secondary battery that has been filled with electrolyte is heated at a temperature of 20° C. and a relative humidity. It is aged for 12h in an environment of less than or equal to 10%, and then under a negative pressure of -0.085MPa, first charge to 2.5V at a rate of 0.01C, and then charge it to 3.2V at a rate of 0.05C. Then charge to 3.6V with a constant current rate of 0.1C, and seal the battery when the voltage reaches 3.6V.

[0019] In the second step, the sealed battery was aged at 50°C for 24 hours, then charged to 4.0V with a constant current of 0.5C, then charged to 4.2V with a constant current of 0.2C, and finally charged to 4.2V. Under constant voltage charging, the charging cut-off current is 100mA.

Example Embodiment

[0020] Embodiment 2, this embodiment provides a method for forming a lithium ion secondary battery for the first time, including the following steps: the first step, the lithium ion secondary battery that has been filled with electrolyte is heated at a temperature of 70° C. and a relative humidity. It is aged for 24h in an environment of less than or equal to 10%, and then under a negative pressure of -0.092MPa, first charge to 2.5V with a constant current rate of 0.02C, and then charge it to 3.2V with a constant current rate of 0.07C. Then charge to 3.6V with a constant current rate of 0.15C, and seal the battery when the voltage reaches 3.6V.

[0021] In the second step, the sealed battery was aged at 70°C for 72h, then charged to 3.9V with a constant current of 0.7C, then charged to 4.2V with a constant current of 0.3C, and finally charged to 4.2V. Under constant voltage charging, the charging cut-off current is 10mA.

Example Embodiment

[0022] Embodiment 3, the first charging formation method of a lithium ion secondary battery provided in this embodiment includes the following steps. It is aged for 18h in an environment of less than or equal to 3%, and then under a negative pressure of -0.090MPa, first charge to 2.5V with a constant current rate of 0.03C, and then charge it to 3.2V with a constant current rate of 0.1C. Then charge to 3.6V with a constant current rate of 0.2C, and seal the battery when the voltage reaches 3.6V.

[0023] In the second step, the sealed battery was aged at 10°C for 48 hours, and then charged to 3.8V with a constant current of 1C, then charged to 4.2V with a constant current of 0.5C, and finally charged to 4.2V. Constant voltage charging, the charging cut-off current is 200mA.

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Abstract

The invention belongs to the technical field of lithium-ion secondary batteries, and in particular relates to a first-time charging forming method for a lithium-ion secondary battery. The method comprises the following steps that: carrying out aging treatment on the lithium-ion secondary battery poured with electrolyte, then gradually increasing the charging current to carry out a sectional charge formation on the battery in the state of negative pressure, and sealing the battery when the voltage reaches 3.6 volts; and carrying out aging treatment on the battery, carrying out constant-current charging to 3.8-4.0 volts at a rate of 0.5 C-1 C, then carrying out constant-current charging to 4.2 volts at a rate of 0.2 C-0.5 C, and carrying out constant-voltage charging in the state of 4.2 volts at last. Compared with the prior art, the invention adopts the method of sectional charge formation to charge the battery to 3.6 volts firstly, so as to exhaust the harmful gas produced in the process of forming SEI (solid electrolyte interface), ensure the migration of Li<+> better, enable the formed SEI to be more uniform, stable and compact, and thus improving the cycling performance and high rate discharging performance.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion secondary batteries, and in particular relates to a first-time charging formation method of lithium-ion secondary batteries. Background technique [0002] At present, the first charging formation method of lithium-ion secondary batteries is to charge the battery with a certain current and constant current to 3.4V ~ 3.9V, then vacuumize and seal the battery, and then aging for 24h ~ 168h after sealing, and finally charge with constant current to 4.2V. The disadvantage of this method is that in the process of forming the solid electrolyte interface film (SEI film), certain side reactions will occur and harmful gases will be generated. The harmful gas cannot be discharged in time during the formation of the solid electrolyte interface film, but exists between the pole piece and the diaphragm. When the voltage reaches 3.4V ~ 3.9V, the gas can escape when it is stored in a low-pressure environment...

Claims

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Application Information

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IPC IPC(8): H01M10/058H01M10/44
CPCY02E60/10Y02P70/50
Inventor 洪良仕熊军陈威
Owner 湖北力莱科技有限公司
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