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Formation method of pre-lithiated battery, lithium ion battery and preparation method of lithium ion battery

A lithium ion battery, a technology of a chemical formation method, applied in the field of the formation of a pre-lithiated battery, a lithium ion battery and its preparation, can solve the problem of the reduction of the electrochemical performance of the lithium ion battery, the instability of the electrolyte solvent or additives, the battery cycle, the rate of Problems such as poor performance, to achieve the effect of improving first-time efficiency, reducing energy consumption, and high stability

Inactive Publication Date: 2021-07-27
KUNSHAN BAOTRON NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to obtain a SEI film with better uniformity and stability, the traditional chemical formation process uses a small current chemical formation process. This chemical formation process is conducive to the formation of a stable SEI film, but the process will lead to an increase in the resistance of the formed SEI film. As a result, the cycle and rate performance of the battery are poor; another method is high-temperature and high-current formation, but the electrolyte solvent or additives are unstable at high temperatures, which will also affect the film formation of the electrolyte on the negative electrode, which will lead to lithium-ion batteries. The electrochemical performance of the

Method used

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  • Formation method of pre-lithiated battery, lithium ion battery and preparation method of lithium ion battery
  • Formation method of pre-lithiated battery, lithium ion battery and preparation method of lithium ion battery
  • Formation method of pre-lithiated battery, lithium ion battery and preparation method of lithium ion battery

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preparation example Construction

[0074] One embodiment of the present invention also provides a preparation method of a lithium-ion battery, comprising the following steps:

[0075] S210: Assembling pre-lithium batteries;

[0076] Step S210 can use existing battery cells and their assembly methods, which are not specifically limited here, and should be understood as being within the protection scope of the present invention.

[0077] S220: forming;

[0078] The chemical conversion method in step S220 is as described above, and is not particularly limited here.

[0079] S230: Carry out two sealing exhausts on the battery cells, aging, and capacity division.

[0080] In some embodiments, in step S230, vacuum exhaust is performed at a temperature of 20°C-30°C (preferably 25°C); further, after the exhaust step and before the aging step, the temperature is 20 ℃-30℃ (preferably 25℃) and stand for 24-72h. After the second seal and exhaust, it is aged at room temperature for a long time, so that the formed SEI fi...

Embodiment 1

[0088] S1: Injection in batches: After the assembly of the pre-lithium battery cell is completed, vacuumize and inject the electrolyte in batches; the injection coefficient is 3.2, the batch injection is 2 times, the vacuum degree is -60KPa, and the battery is left to stand after each injection 15min.

[0089] S2: Pre-sealing and standing: After the liquid injection is completed, place the cell in a vacuum pre-sealing cavity to vacuumize the edge for pre-sealing. The pre-sealing vacuum degree is -90KPa, and then pressurize and stand still at a pressure of 1.5Kgf / cm 2 , the temperature is 5°C, and the standing time is 48h;

[0090] S3: Formation of pre-embedded lithium: charge the pre-lithium battery at room temperature with a small current and pressurized charge at a charging current of 0.02C, charge to 20% SOC, leave it at room temperature for 4 hours after charging, and discharge to 5% SOC;

[0091] S4: Segmented current formation: After the pre-formation, increase the form...

Embodiment 2

[0094] S1: Injection in batches: After the assembly of the pre-lithium battery is completed, vacuumize and inject the electrolyte in batches; the injection coefficient is 3.2, the batch injection is 3 times, the vacuum is -60KPa, and the battery is left to stand after each injection 15min.

[0095] S2: Pre-sealing and standing: After the liquid injection, put the cell in the vacuum pre-sealing cavity to vacuumize the edge for pre-sealing, the pre-sealing vacuum degree is -90KPa, and then pressurize and stand still, the pressure is 3Kgf / cm 2 , the temperature is 5°C, and the standing time is 64h;

[0096] S3: Formation of pre-embedded lithium: charge the pre-lithium battery at room temperature with a small current and pressurized charge at a charging current of 0.02C, charge to 20% SOC, leave it at room temperature for 4 hours after charging, and discharge to 5% SOC;

[0097] S4: Segmented current formation: After the pre-formation is completed, increase the formation pressure...

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Abstract

The invention provides a formation method of a pre-lithiation battery, a lithium ion battery and a preparation method of the lithium ion battery. The pre-lithiation battery is provided with a negative electrode pre-lithiation layer, and the formation method comprises the following steps: vacuumizing the pre-lithiation battery provided with a pre-lithiation cell, and injecting electrolyte in batches; performing edge pre-sealing, performing pressurization standing in the environment with the temperature ranging from -20 DEG C to 15 DEG C, and the pressure ranging from 0.01 Kgf / cm <2> to 5 Kgf / cm <2>; in an environment with the temperature of 15-35 DEG C, charging the battery core to 5-30% SOC with the current of 0.01-0.1 C, and after charging is finished, discharging the battery core to 4-6% SOC; and in the environment with the temperature of 15-35 DEG C, performing charging by adopting segmented current, the current being from small to large, and charging to 100% SOC. The formation method of the pre-lithiated battery is simple and convenient to operate, a stable SEI film can be formed, and the cycle performance of the lithium ion battery can be further improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a formation method of a pre-lithiated battery, a lithium ion battery and a preparation method thereof. Background technique [0002] With the widespread use of lithium-ion batteries, electrochemical energy storage puts forward higher requirements on the cost, energy density, cycle life and safety of lithium-ion batteries. In the lithium-ion battery production process, after the battery cell is prepared, it needs to go through the continuous process of liquid injection, formation and aging. The liquid injection, formation / aging process is a long-term and high-cost process. This process affects the performance and performance of lithium-ion batteries. Service life has a significant impact. Among them, a very important factor is the electrode wetting process, and sufficient and balanced cell wetting is particularly important in the formation / aging process. After the electrolyte ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/0525H01M10/058
CPCH01M10/446H01M10/0525H01M10/058H01M2220/20Y02P70/50Y02E60/10
Inventor 李文龙赵育松梁世硕邱昭政张永庆
Owner KUNSHAN BAOTRON NEW ENERGY TECH CO LTD