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 battery, etc., to ensure cycle life and safety performance, improve high-rate discharge performance, and shorten production cycle effect

Inactive Publication Date: 2015-06-24
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 the harmful gas caused by the charging and forming method remains in the lithium-ion secondary battery is better guaranteed + Migration, so that the formed SEI film is more uniform, stable and dense, so as to ensure the capacity, life, internal resistance, rate and safety of lithium-ion secondary batteries, and improve product quality

Method used

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

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Embodiment 1

[0018] Embodiment 1, a kind of lithium ion secondary battery that this embodiment provides the initial charge formation method, comprises 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 relative humidity Aged for 12 hours in an environment less than or equal to 10%, and then charged to 2.5V with a constant current rate of 0.01C at a negative pressure of -0.085MPa, and then charged to 3.2V with a constant current rate of 0.05C. Then charge to 3.6V with a constant current at a rate of 0.1C, and seal the battery when the voltage reaches 3.6V.

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

Embodiment 2

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

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

Embodiment 3

[0022] Embodiment 3, a method for forming a lithium-ion secondary battery for the first time provided in this embodiment, comprises the following steps: the first step, the lithium-ion secondary battery that has been injected with electrolyte is heated at a temperature of 50°C and a relative humidity Aged for 18 hours in an environment less than or equal to 3%, and then charged to 2.5V with a constant current rate of 0.03C at a negative pressure of -0.090MPa, and then charged to 3.2V at a rate of 0.1C. Then charge it to 3.6V with a constant current at a rate of 0.2C, and seal the battery when the voltage reaches 3.6V.

[0023] In the second step, the sealed battery is aged at 10°C for 48 hours, then charged to 3.8V at a rate of 1C, and then charged to 4.2V at a rate of 0.5C, and finally charged at 4.2V Constant voltage charging, 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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Patent Type & Authority Patents(China)
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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