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Step-by-step formation method of lithium ion battery

A technology of lithium-ion batteries and chemical formation methods, applied in the field of lithium-ion batteries, can solve problems such as lithium salts cannot be guaranteed, affect material performance, affect battery rate performance and cycle performance, and avoid metal lithium deposition, improve film quality, The effect of improving stability

Active Publication Date: 2019-12-13
泰州纳新新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, doped lithium manganese oxide is widely used as a positive electrode material, but since the material is difficult to extract all lithium ions during charging and discharging, it will affect the number of lithium ions that can migrate in the battery, thereby affecting the battery life. Rate performance and cycle performance, and the preparation method of lithium-rich method is generally used in this field to supplement lithium ions, that is, when synthesizing materials, lithium salts are added according to the molar ratio of lithium ions: active material is 1.1-1.2, but the method’s The disadvantage is that the added lithium salt cannot be guaranteed to enter the crystal lattice of the material. In fact, how many lithium ions can be embedded in the material is uncertain, and the product will contain unreacted lithium salt, which will affect the performance of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preformed:

[0037] 1), the positive electrode and the lithium sheet are opposed to form an experimental battery, which is placed in the first electrolyte;

[0038] 2), cycle 3 times between 4.2V and 2.7V;

[0039] 3) Adjust the voltage to 2.7V and let it stand for 30 minutes;

[0040] 4) Pulse discharge with a pulse current of 0.02C, a pulse time of 5s, and an interval of 10s until the battery voltage drops to 2.65V;

[0041] 5), take out the positive electrode, and obtain the preformed positive electrode;

[0042] formalized

[0043] 1), the preformed positive electrode, diaphragm, and graphite negative electrode are assembled into a battery;

[0044] 2), inject the second electrolyte;

[0045] 3), constant current charging to 3.0V;

[0046] 4) Perform a pulse charge-discharge cycle between 2.7V and 3.0V; the pulse charge-discharge cycle includes: with a pulse current of 0.1C, the pulse time is 60s, and the interval is 5s, and the cycle is 3 times; with a pulse ...

Embodiment 2

[0050] Preformed:

[0051] 1), the positive electrode and the lithium sheet are opposed to form an experimental battery, which is placed in the first electrolyte;

[0052] 2), cycle 3 times between 4.2V and 2.7V;

[0053] 3) Adjust the voltage to 2.7V and let it stand for 30 minutes;

[0054] 4) Pulse discharge with a pulse current of 0.01C, a pulse time of 30s, and an interval of 60s until the battery voltage drops to 2.65V;

[0055] 5), take out the positive electrode, and obtain the preformed positive electrode;

[0056] formalized

[0057] 1), the preformed positive electrode, diaphragm, and graphite negative electrode are assembled into a battery;

[0058] 2), inject the second electrolyte;

[0059] 3), constant current charging to 3.0V;

[0060] 4) Perform a pulse charge-discharge cycle between 2.7V and 3.0V; the pulse charge-discharge cycle includes: with a pulse current of 0.1C, the pulse time is 60s, and the interval is 5s, and the cycle is 3 times; with a pulse...

Embodiment 3

[0064] Preformed:

[0065] 1), the positive electrode and the lithium sheet are opposed to form an experimental battery, which is placed in the first electrolyte;

[0066] 2), cycle 3 times between 4.2V and 2.7V;

[0067] 3) Adjust the voltage to 2.7V and let it stand for 30 minutes;

[0068] 4) Pulse discharge with a pulse current of 0.01C, a pulse time of 20s, and an interval of 30s until the battery voltage drops to 2.65V;

[0069] 5), take out the positive electrode, and obtain the preformed positive electrode;

[0070] formalized

[0071] 1), the preformed positive electrode, diaphragm, and graphite negative electrode are assembled into a battery;

[0072] 2), inject the second electrolyte;

[0073] 3), constant current charging to 3.0V;

[0074] 4) Perform a pulse charge-discharge cycle between 2.7V and 3.0V; the pulse charge-discharge cycle includes: with a pulse current of 0.1C, the pulse time is 60s, and the interval is 5s, and the cycle is 3 times; with a pulse c...

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PUM

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Abstract

The invention provides a step-by-step formation method of a lithium ion battery. A positive electrode material of the lithium ion battery is lithium manganate doped with a nickel element and a cobaltelement. The formation method comprises the following steps of oppositely assembling a positive electrode and a lithium sheet into a test battery, carrying out pre-formation; and then using the pre-formed positive electrode and a graphite negative electrode to form the battery, and carrying out formal formation. According to the battery obtained in the invention, the positive electrode can be effectively supplemented with lithium in a pre-formation stage, a quantity of transportable lithium ions in the battery is increased, and meanwhile, an SEI film is formed on a surface of the positive electrode in advance so that stability of the positive electrode to an electrolyte is improved, and the SEI film can be better generated during later formation.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a step-by-step formation method of lithium-ion batteries. Background technique [0002] In the prior art, doped lithium manganese oxide is widely used as a positive electrode material, but since the material is difficult to extract all lithium ions during charging and discharging, it will affect the number of lithium ions that can migrate in the battery, thereby affecting the battery life. Rate performance and cycle performance, and the preparation method of lithium-rich method is generally used in this field to supplement lithium ions, that is, when synthesizing materials, lithium salts are added according to the molar ratio of lithium ions: active material is 1.1-1.2, but the method’s The disadvantage is that the added lithium salt cannot be guaranteed to fully enter the crystal lattice of the material. In fact, how many lithium ions can be embedded in the materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/44H01M10/058
CPCH01M10/058H01M10/446Y02E60/10Y02P70/50
Inventor 钱起
Owner 泰州纳新新能源科技有限公司
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