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Pulse formation method for lithium ion battery

A technology of lithium-ion battery and formation method, which is applied in the field of pulse formation, can solve the problems of unfavorable development of lithium-ion battery technology, unfavorable positive electrode surface film stability, and low cycle life of lithium-ion batteries, so as to improve formation efficiency and improve equipment use rate, reducing the effect of forming time

Inactive Publication Date: 2019-04-12
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can ensure that the positive electrode material is fully activated, it takes a long time and is not conducive to the stability of the positive electrode surface film.
It can be seen that the common formation methods in the prior art have the problem of low formation efficiency, which further leads to low cycle life of lithium-ion batteries, which is not conducive to the development of lithium-ion battery technology

Method used

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  • Pulse formation method for lithium ion battery

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The pulse type formation method described in this embodiment is carried out for lithium-ion batteries, the positive electrode active material of the lithium-ion battery is a lithium-rich manganese-based positive electrode material, and the negative electrode active material is 650mAh g -1 Silicon carbon material, the assembled battery capacity is 2Ah, and the assembly process is carried out according to the conventional process in the industry. The specific formation method includes the following steps:

[0037] (1) For the prepared lithium-ion battery, charge it with a constant current of 0.05C until the applied pressure of the cell reaches 3.5V, and let it stand for 10 minutes for standby;

[0038] (2) Charge the above-mentioned lithium-ion battery with a constant current and constant voltage at 0.1C until the applied voltage of the cell reaches the pulse starting voltage of 4.3V, and let it stand for 30 minutes;

[0039] (3) Discharge the above-mentioned lithium-ion ...

Embodiment 2

[0047] The pulse type formation method described in this embodiment is carried out for lithium-ion batteries, the positive electrode active material of the lithium-ion battery is a lithium-rich manganese-based positive electrode material, and the negative electrode active material is 650mAh g -1 Silicon carbon material, the assembled battery capacity is 2Ah, and the assembly process is carried out according to the conventional process in the industry. The specific formation method includes the following steps:

[0048] (1) For the prepared lithium-ion battery, charge it with a constant current of 0.05C until the applied pressure of the cell reaches 3.5V, and let it stand for 10 minutes for standby;

[0049] (2) Charge the above-mentioned lithium-ion battery with a constant current and constant voltage at 0.1C until the applied voltage of the cell reaches the pulse start voltage of 4.7V, control the cut-off current to 0.01C, and let it stand for 30 minutes;

[0050] (3) Dischar...

Embodiment 3

[0058] The pulse type formation method described in this embodiment is carried out for lithium-ion batteries, the positive electrode active material of the lithium-ion battery is a lithium-rich manganese-based positive electrode material, and the negative electrode active material is 650mAh g -1 Silicon carbon material, the assembled battery capacity is 2Ah, and the assembly process is carried out according to the conventional process in the industry. The specific formation method includes the following steps:

[0059] (1) For the prepared lithium-ion battery, charge it with a constant current of 0.05C until the applied pressure of the cell reaches 3.5V, and let it stand for 10 minutes for standby;

[0060] (2) Charge the above-mentioned lithium-ion battery with a constant current and constant voltage at 0.1C until the applied voltage of the cell reaches the pulse starting voltage of 4.3V, and let it stand for 30 minutes;

[0061] Discharge the above-mentioned lithium-ion batt...

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Abstract

The invention belongs to the technical field of lithium ion batteries, particularly relates to a pulse formation method for a lithium ion battery and further discloses the lithium ion battery preparedby the method. According to the formation method for the lithium ion battery, the whole formation process is completed by locking a special voltage zone of the charging process and the discharging process and by performing the pulse charging process and the pulse discharging process alternatively, the formation efficiency of the lithium ion battery is effectively improved, the cycle lifetime of the lithium ion battery is prolonged, and the quality of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, in particular to a pulse formation method for lithium-ion batteries, and further discloses a lithium-ion battery prepared by the method. Background technique [0002] Lithium-ion battery is a secondary battery or rechargeable battery, which mainly relies on lithium ions to move back and forth between the positive electrode and the negative electrode to work. During the charging and discharging process, Li + Intercalation and deintercalation back and forth between the two electrodes: while charging, Li + Then it will be deintercalated from the positive electrode and inserted into the negative electrode through the electrolyte, so that the negative electrode is in a lithium-rich state; the opposite is true during discharge. Due to its good environmental compatibility, long cycle life, and low self-discharge rate, lithium-ion batteries have developed into the most commonly used energ...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/0525H01M10/058
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 马磊磊王建涛庞静邵泽超武兆辉武佳雄
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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