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Lithium ion battery formation method

A technology of lithium-ion battery and chemical formation method, which is applied in the field of battery manufacturing, can solve the problems of SEI film dissolution and destruction, violent reaction, and large current, and achieve the effects of improving battery cycle performance, improving quality, and reducing expansion

Inactive Publication Date: 2021-03-30
东莞维科电池有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing chemical formation method has high temperature, high current, and violent reaction, and the formed SEI film is easily dissolved and destroyed in the subsequent cycle process.

Method used

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  • Lithium ion battery formation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for forming a lithium ion battery, comprising the steps of:

[0034] 1) Place the cell in the chemical conversion equipment and heat up to 45°C;

[0035] 2) Pressurize the cell, the pressurization pressure is 1.0Mpa;

[0036] 3) Carry out the first stage of constant current charging to the battery cell, the charging current is 0.1C, the charging time is 80min, and the battery is charged to 13.3% of the nominal capacity;

[0037] 4) Let the battery stand for 6s;

[0038] 5) Carry out the second stage of constant current charging to the battery cell, the charging current is 0.2C, the charging time is 180min, and the battery is charged to 60% of the nominal capacity.

[0039] In this embodiment, after the formation is completed, the cell is maintained at 73% %SOC.

[0040] In this embodiment, the positive electrode sheet of the battery cell includes a positive electrode current collector and a positive electrode active material layer disposed on the surface of ...

Embodiment 2

[0043] The difference with embodiment 1 is:

[0044] The lithium-ion battery formation method of the present embodiment comprises the following steps:

[0045] 1) Place the cell in the chemical conversion equipment and heat up to 40°C;

[0046] 2) Pressurize the cell, the pressurization pressure is 0.9Mpa;

[0047] 3) Carry out the first stage of constant current charging to the battery cell, the charging current is 0.02C, the charging time is 200min, and the battery is charged to 12% of the nominal capacity;

[0048] 4) Let the battery stand for 6s;

[0049] 5) Carry out the second stage of constant current charging to the battery cell, the charging current is 0.1C, the charging time is 90min, and the battery is charged to 54% of the nominal capacity.

[0050] After the formation is completed, the battery remains at 73% SOC.

[0051] The rest are the same as in Embodiment 1, and will not be repeated here.

Embodiment 3

[0053] The difference with embodiment 1 is:

[0054] The lithium-ion battery formation method of the present embodiment comprises the following steps:

[0055] 1) Place the cell in the chemical conversion equipment and heat up to 60°C;

[0056] 2) Pressurize the cell, the pressurization pressure is 1.1Mpa;

[0057] 3) Carry out the first stage of constant current charging to the battery cell, the charging current is 0.05C, the charging time is 150min, and the battery is charged to 15% of the nominal capacity;

[0058] 4) Let the battery stand for 6s;

[0059] 5) Carry out the second stage of constant current charging to the battery cell, the charging current is 0.2C, the charging time is 180min, and the battery is charged to 68% of the nominal capacity.

[0060] After the formation is completed, the battery remains at 74% SOC.

[0061] The rest are the same as in Embodiment 1, and will not be repeated here.

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Abstract

The invention belongs to the technical field of battery manufacturing, and particularly relates to a lithium ion battery formation method which comprises the following steps of putting a battery cellinto a formation device, and heating to 40-60 DEG C; pressurizing the battery cell, wherein the pressurizing pressure ranges from 0.9 Mpa to 1.1 Mpa; carrying out first-stage constant-current chargingon the battery cell, wherein the charging current is 0.02-0.2 C, and the charging time is 2-200 minutes; and carrying out second-stage constant-current charging on the battery cell, wherein the charging current is 0.05-0.3 C, and the charging time is 2-200 minutes. Compared with the prior art, the formation method has the advantages that the quality of an SEI film is improved, the cyclic expansion of the silicon negative electrode lithium ion battery is reduced, and the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a method for forming a lithium ion battery. Background technique [0002] At present, with the rapid development of science and technology, the development of high-energy lithium-ion batteries urgently needs to find high-capacity, long-life, safe and reliable new negative electrodes to replace graphite-based carbon negative electrodes. Among various non-carbon anode materials, silicon has unique advantages and potentials. However, when silicon is used as the anode material of lithium-ion batteries, the disadvantages are also very obvious. During the electrochemical cycle, the insertion and extraction of lithium ions will cause the volume of silicon-based materials to expand and shrink by more than 300%, reducing the cycle performance. The existing technology is mainly to reduce the volume expansion caused by cycling by changing the silicon-based negativ...

Claims

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Application Information

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IPC IPC(8): H01M10/44H01M10/058H01M10/0525
CPCH01M10/0525H01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 韩永琪占克军
Owner 东莞维科电池有限公司
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